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Structural plane shear strength size effect testing device equivalence testing method

A technology of shear strength and test equipment, applied in the field of effectiveness testing, can solve problems such as inability to test equivalence, achieve great implementation value, social and economic benefits, and reliable test results

Active Publication Date: 2013-10-02
SHAOXING UNIVERSITY
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Problems solved by technology

[0004] In order to overcome the deficiency that the equivalence of the test results of each direct shear instrument cannot be checked in the prior art, the present invention provides a method for effectively testing the equivalence of the test results of each direct shear instrument, strong operability and low cost Equivalence test method of size effect test device for structural surface shear strength

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  • Structural plane shear strength size effect testing device equivalence testing method
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[0015] The present invention will be further described below.

[0016] A method for testing the equivalence of a structural surface shear strength size effect test device, characterized in that: the test device is composed of n direct shear instruments, and the n direct shear instruments with test sizes ranging from small to large correspond to overlapping sample sizes L respectively 1 × L 1 , L 2 × L 2 ,...,L n-1 × L n-1 . The equivalence test method of the test device includes the following steps:

[0017] (1) Let the sample size be L x × L x is the overlap size of two direct shear instruments, where (X=1~n-1). Sample size is L x × L x The same rock mass structural plane was tested for shear strength on direct shear instruments of different sizes (a total of two direct shear instruments). According to the water conservancy and hydropower engineering rock test regulations (DL / T5368-2007), a relatively small direct shear instrument (denoted as the xth direct shear ...

example

[0022] The sample size span of the test is (100mm×100mm-1000mm×1000mm), the load span is 2-1000kN, and the load span is 500 times. The series of direct shear instruments are composed of two direct shear instruments, one small direct shear instrument can test the structural surface sample range of 100mm×100mm-400mm×400mm; the other large direct shear instrument can test the structural surface sample range of 400mm ×400mm-1000mm×1000mm; the size of the same structural surface sample that can be measured by two direct shear instruments is 400mm×400mm.

[0023]Take 16 groups of model structural surface samples with the size of 400mm×400mm and the same physical and mechanical properties. Among them, 8 groups carried out the direct shear test under the same normal stress on the small direct shear instrument, and the measured shear strength with 95% guarantee rate was taken as the average value, which was recorded as The other 8 groups carried out the direct shear test under the sa...

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Abstract

The invention provides a structural plane shear strength size effect testing device equivalence testing method. A testing device consists of n direct shear apparatuses. The equivalence testing method comprises the following steps of: (1) taking the sample size Lx x Lx as the overlapping sizes of two direct shear apparatuses, firstly carrying out shear strength tests on at least 5 groups of same structural planes with the sample size being Lx x Lx by adopting the nth direct shear apparatus to test the shear strength with the preset assurance rate; (2) then carrying out the shear strength tests on at least 5 groups of same structural planes with the sample size being Lx x Lx by adopting the (x+1)th direct shear apparatus; (3) carrying out equivalence tests on the shear strength of the structural planes of rock mass with the same sizes tested by the two direct shear apparatuses; (4) by adopting the methods in the steps (1), (2) and (3), respectively carrying out the equivalence tests on the overlapped samples of the n direct shear apparatuses. The structural plane shear strength size effect testing device and the equivalence testing method can be used for effectively testing the equivalence of testing results of all the direct shear apparatuses, and are strong in operability and low in cost.

Description

technical field [0001] The invention relates to the technical field of the shear strength size effect test of a rock mass structural surface, in particular to a method for testing the equivalence of a structural surface shear strength size effect test device. Background technique [0002] The shear strength of the structural plane of rock mass has the characteristics of size effect, that is, as the size of the structural plane increases, its shear strength tends to decrease, and when the scale increases to a certain extent, its shear strength tends to be constant. Therefore, In order to obtain the size effect law of the shear strength of the structural plane and determine the stability threshold of the shear strength of the structural plane, it is necessary to carry out direct shear tests on the shear strength of the structural plane with different sizes. According to the water conservancy and hydropower engineering rock test regulations (DL / T5368—2007), the maximum normal s...

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Application Information

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IPC IPC(8): G01N3/62
Inventor 杜时贵黄曼罗战友吕原君张晓莺
Owner SHAOXING UNIVERSITY
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