CN103471917B - Tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing - Google Patents
Tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing Download PDFInfo
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- CN103471917B CN103471917B CN201310425838.0A CN201310425838A CN103471917B CN 103471917 B CN103471917 B CN 103471917B CN 201310425838 A CN201310425838 A CN 201310425838A CN 103471917 B CN103471917 B CN 103471917B
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- place concrete
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- lining cutting
- concrete lining
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Abstract
The invention discloses a kind of tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing, it is characterized in that comprising the following steps: 1. make Cast-in-place concrete lining cutting local test specimen, and be coated with lubricant in its side; 2. Cast-in-place concrete lining cutting local test specimen is put into U-type groove, then install successively and load cushion block and side shield; 3. combinations thereof structure is put in experimental machine and loads, the data such as the force-displacement curve of the destructive process of record test specimen.The present invention simulates the actual forced status of Cast-in-place concrete lining cutting by special load maintainer, can be used for studying the character such as the load-bearing capacity of circular or similar round tunnel Cast-in-place concrete lining cutting and stressed, distortion, destruction, can also as a kind of method detecting construction quality.The present invention adopts Cast-in-place concrete lining cutting local test specimen to carry out testing the bearing capacity that can obtain Cast-in-place concrete lining cutting entirety, greatly saves experimental cost relative to tunneling boring experiment.
Description
Technical field
The present invention relates to the test of tunnel support engineering Cast-in-place concrete lining cutting load-bearing capacity and quality testing field, particularly relate to a kind of tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing.
Background technology
Under high-ground stress or weak surrounding rock condition, tunnel Cast-in-place concrete lining cutting is often peeled off, the phenomenon such as crackle and fall damage.Think, pressure from surrounding rock and/or deflection excessive be the main cause causing Cast-in-place concrete damage of lining.
In order to prevent the generation of these accidents, needing when tunnel support designs to assess the load-bearing capacity of Cast-in-place concrete lining cutting, in lining construction process, also will carry out sampling and testing to its quality.Traditional test is all get cylindrical or cube standard specimen to carry out corresponding strength test, can not consider the arc shell design feature of Cast-in-place concrete lining cutting.Owing to being subject to the restriction of various condition, be also difficult to the load-bearing capacity of directly testing Cast-in-place concrete lining cutting at present.
Summary of the invention
The object of the invention is for overcoming the deficiencies in the prior art, a kind of tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing is provided.
Its technical solution is:
A kind of tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing, is characterized in that comprising the following steps:
make Cast-in-place concrete lining cutting local test specimen, and be coated with lubricant in its side, to reduce the friction force be subject in its experimentation; Described Cast-in-place concrete lining cutting local test specimen, upper and lower surface is coaxial circles cambered surface, and the extension line of left and right side passes through the axis of above-mentioned arc surface, and front and back sides is perpendicular to surface level; Its essence is the similar trapezoidal test block formed by cutting tunnel, two faces Cast-in-place concrete lining cutting of tunnel axis; The concrete method for making of Cast-in-place concrete lining cutting local test specimen comprises the following two kinds: a. makes the mould of respective shapes, copies site operation situation assembling reinforcement placing concrete, the demoulding after maintenance certain hour under class field condition, then by smooth for its surface finish; B. extracted the test specimen of general shape by cutting machine at tunnel construction site, be processed into standard shape by instruments such as stone mills and polish smooth;
cast-in-place concrete lining cutting local test specimen is put into U-type groove, then installs successively and load cushion block and side shield;
Described U-type groove is one-piece construction, comprises base plate and two sidewalls; Side wall inner surfaces is horizontal by certain inclination angle, and this inclination angle is mated with the inclination angle on test specimen two inclined-planes, Cast-in-place concrete lining cutting local; Base plate lower surface contacts with test machine loader, bears testing machine pressure; The effect of U-type groove is two sides testing machine pressure perpendicular being delivered to Cast-in-place concrete lining cutting local test specimen, reflects boundary condition when it is applied at the scene more really;
Described loading cushion block, lower surface is that circular arc contacts with Cast-in-place concrete lining cutting local test specimen upper surface, and left and right sides are parallel with U-type groove inside surface, load between cushion block side and U-type groove inside surface and leave space, extrude both preventing in loading procedure; Upper surface is plane, contacts with test machine loader; The effect loading cushion block is testing machine pressure uniform to be delivered to Cast-in-place concrete lining cutting local test specimen upper surface;
Described side shield, has two pieces, is separately fixed at the both sides, front and back of U-type groove, and inside surface contacts with the front and rear surfaces of Cast-in-place concrete lining cutting local test specimen; Its role is to prevent the test specimen generation axial deformation of Cast-in-place concrete lining cutting local, to meet the requirement of plane strain state, prevent the sidewall of U-type groove to be out of shape to both sides simultaneously;
combinations thereof structure is put in experimental machine and loads, the data such as the force-displacement curve of the destructive process of record test specimen; Described experimental machine is for can execute stressed testing machine; The compressive stress of testing machine corresponding when test specimen cracks to test specimen is cracking bearing capacity, and the maximum crushing stress of testing machine to test specimen is destruction bearing capacity, and the displacement that cracking bearing capacity is corresponding in force-displacement curve is allowable transformation amount; The displacement destroying bearing capacity corresponding in force-displacement curve is maximum deformation quantity.
In order to observed and recorded test specimen destroys situation at any time, following either a program can be taked: a. is by acoustic emission equipment actively detect crack spread scenarios; B. wherein one block of high-strength transparent material of making material selection of side shield, and join the reinforcing of bar shaped steel; C. on two pieces of side shields, arrange 1 ~ 3 hoop eye split respectively, in order to reduce the impact on test specimen, eye split width is unsuitable excessive.
Principle of the present invention is:
The tunnel of current construction adopts circular or similar round section greatly, when country rock horizontal pressure force and vertical pressure difference little, stressed, the deformation and failure problem of tunnel Cast-in-place concrete lining cutting can be similar to thinks axisymmetric problem.For axisymmetric problem, its part (i.e. Cast-in-place concrete lining cutting local of the present invention test specimen) can be got and carry out testing the character that can reflect Cast-in-place concrete lining cutting entirety.
In axisymmetric problem, radial deformation only occurs for country rock and Cast-in-place concrete lining cutting does not have tangential deformation, is only subject to normal stress not by tangential stress.The present invention limits the tangential deformation of Cast-in-place concrete lining cutting local test specimen by U-type groove side wall inner surfaces, impelling Cast-in-place concrete lining cutting local test specimen generation radial deformation, so just meeting the displacement boundary conditions of axisymmetric problem by loading cushion block; Normal stress is only had owing to loading between cushion block and test specimen upper surface, and also can be similar between test specimen and U-type groove side wall inner surfaces and side shield and think to only have normal stress (under the effect of lubricant, its friction force is negligible), so just meet the stress boundary condition of axisymmetric problem.
In sum, the present invention can simulate actual forced status and the destruction situation thereof of Cast-in-place concrete lining cutting.The present invention can be used for studying the character such as the load-bearing capacity of circular or similar round tunnel Cast-in-place concrete lining cutting and stressed, distortion, destruction, can also as a kind of method detecting construction quality.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the invention will be further described:
Fig. 1 is mechanics principle figure of the present invention;
Fig. 2 is agent structure schematic diagram of the present invention;
Fig. 3 is the mechanics principle figure that side shield of the present invention is fixed on U-type groove;
Fig. 4 is agent structure schematic diagram of the present invention;
Fig. 5 is mechanics principle figure of the present invention.
Embodiment
By reference to the accompanying drawings 1, the present invention adopts the principle of local test specimen to be: under specific circumstances, stressed, the deformation and failure problem of tunnel Cast-in-place concrete lining cutting can be similar to thinks axisymmetric problem, can get its part (i.e. Cast-in-place concrete lining cutting local of the present invention test specimen 1) to carry out testing the character that can reflect Cast-in-place concrete lining cutting entirety, and then the present invention meets the Stress and displacement boundary condition on rotational symmetry border by specific experimental provision and method.
By reference to the accompanying drawings 1,2 and 3, a kind of tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing, is characterized in that comprising the following steps:
make Cast-in-place concrete lining cutting local test specimen 1, and be coated with lubricant in its side, to reduce the friction force be subject in its experimentation; Described Cast-in-place concrete lining cutting local test specimen 1, upper and lower surface is coaxial circles cambered surface, and the extension line of left and right side passes through the axis of above-mentioned arc surface, and front and back sides is perpendicular to surface level; Its essence is the similar trapezoidal test block formed by cutting tunnel, two faces Cast-in-place concrete lining cutting of tunnel axis; The concrete method for making of Cast-in-place concrete lining cutting local test specimen comprises the following two kinds: a. makes the mould of respective shapes, copy site operation situation assembling reinforcement placing concrete, the demoulding after maintenance certain hour under class field condition, then by smooth for its surface finish, b. extracted the test specimen of general shape at tunnel construction site by cutting machine, be processed into standard shape by instruments such as stone mills and polish smooth, being coated with lubricant in side;
cast-in-place concrete lining cutting local test specimen is put into U-type groove 2, then installs successively and load cushion block 3 and side shield 4;
Described U-type groove 2 is one-piece construction, comprises base plate and two sidewalls; Side wall inner surfaces is horizontal by certain inclination angle, and this inclination angle is mated with the inclination angle on test specimen two inclined-planes, Cast-in-place concrete lining cutting local, prearrangement of deformation amount space 5 between Cast-in-place concrete lining cutting local test specimen lower surface and U-type groove plate upper surface; Base plate lower surface contacts with test machine loader, bears testing machine pressure; The effect of U-type groove is two sides testing machine pressure perpendicular being delivered to Cast-in-place concrete lining cutting local test specimen, reflects boundary condition when it is applied at the scene more really;
Described loading cushion block 3, lower surface is that circular arc contacts with Cast-in-place concrete lining cutting local test specimen upper surface, and left and right sides are parallel with U-type groove inside surface, load between cushion block side and U-type groove inside surface and leave space, extrude both preventing in loading procedure; Upper surface is plane, contacts with test machine loader; The effect loading cushion block is testing machine pressure uniform to be delivered to Cast-in-place concrete lining cutting local test specimen upper surface;
Described side shield 4, has two pieces, is separately fixed at the both sides, front and back of U-type groove, and inside surface contacts with the front and rear surfaces of Cast-in-place concrete lining cutting local test specimen; Its role is to prevent the test specimen generation axial deformation of Cast-in-place concrete lining cutting local, to meet the requirement of plane strain state, prevent the sidewall of U-type groove to be out of shape to both sides simultaneously;
combinations thereof structure is put in experimental machine and loads, the data such as the force-displacement curve of the destructive process of record test specimen; Described experimental machine is for can execute stressed testing machine; The compressive stress of testing machine corresponding when test specimen cracks to test specimen is cracking bearing capacity, and the maximum crushing stress of testing machine to test specimen is destruction bearing capacity, and the displacement that cracking bearing capacity is corresponding in force-displacement curve is allowable transformation amount; The displacement destroying bearing capacity corresponding in force-displacement curve is maximum deformation quantity.
Composition graphs 4, in order to observed and recorded test specimen at any time destroys situation, side shield wherein one piece make material and can select high-strength transparent material, and join bar shaped steel 6 and reinforce.
Composition graphs 5, in order to observed and recorded test specimen destroys situation at any time, can arrange 1 ~ 3 hoop eye split 7 respectively on two pieces of side shields, and in order to reduce the impact on test specimen, eye split width is unsuitable excessive.
The above embodiment, the just one of the embodiment that the present invention is more preferably concrete, the usual change that those skilled in the art carries out within the scope of technical solution of the present invention and replacement all should be included in protection scope of the present invention.
Claims (4)
1. a tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing, is characterized in that, comprise the following steps:
1. make Cast-in-place concrete lining cutting local test specimen, and be coated with lubricant in its side; Described Cast-in-place concrete lining cutting local test specimen, upper and lower surface is coaxial circles cambered surface, and the extension line of left and right side passes through the axis of above-mentioned arc surface, and front and back sides is perpendicular to surface level; Its method for making comprises the following two kinds: a. makes the mould of respective shapes, copies site operation situation assembling reinforcement placing concrete, the demoulding after maintenance certain hour under class field condition, then by smooth for its surface finish; B. extracted the test specimen of general shape by cutting machine at tunnel construction site, be processed into standard shape by stone mill and polish smooth;
2. Cast-in-place concrete lining cutting local test specimen is put into U-type groove, then install successively and load cushion block and side shield, form unitized construction; Described U-type groove is one-piece construction, comprises base plate and two sidewalls; Side wall inner surfaces is horizontal by certain inclination angle, and this inclination angle is mated with the inclination angle on test specimen two inclined-planes, Cast-in-place concrete lining cutting local; Described loading cushion block, lower surface is that circular arc contacts with Cast-in-place concrete lining cutting local test specimen upper surface, and left and right sides are parallel with U-type groove inside surface, load between cushion block side and U-type groove inside surface and leave space; Described side shield, has two pieces, is separately fixed at the both sides, front and back of U-type groove, and inside surface contacts with the front and rear surfaces of Cast-in-place concrete lining cutting local test specimen;
3. combinations thereof structure is put on testing machine and loads, the force-displacement curve data of the destructive process of record test specimen; Described testing machine is for can execute stressed testing machine; The compressive stress of testing machine corresponding when test specimen cracks to test specimen is cracking bearing capacity, and the maximum crushing stress of testing machine to test specimen is destruction bearing capacity, and the displacement that cracking bearing capacity is corresponding in force-displacement curve is allowable transformation amount; The displacement destroying bearing capacity corresponding in force-displacement curve is maximum deformation quantity.
2. a kind of tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing according to claim 1, is characterized in that by acoustic emission equipment actively detect crack spread scenarios.
3. a kind of tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing according to claim 1, is characterized in that wherein one block of high-strength transparent material of making material selection of described side shield, and joins the reinforcing of bar shaped steel.
4. a kind of tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing according to claim 1, is characterized in that arranging 1 ~ 3 hoop eye split respectively on two pieces of side shields.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310425838.0A CN103471917B (en) | 2013-09-18 | 2013-09-18 | Tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing |
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| CN201310425838.0A CN103471917B (en) | 2013-09-18 | 2013-09-18 | Tunnel Cast-in-place concrete lining cutting load-bearing capacity method of testing |
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| CN103471917B true CN103471917B (en) | 2015-12-02 |
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| CN100587461C (en) * | 2006-08-25 | 2010-02-03 | 同济大学 | Tunnel lining component high-temperature mechanical property testing system |
| CN102004054B (en) * | 2010-09-21 | 2012-02-29 | 同济大学 | Three-way loading mechanical property test system of multifunctional lining segment joint |
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Granted publication date: 20151202 Termination date: 20190918 |