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Testing equipment and test method for soft rock filling deterioration

A technology of test equipment and test methods, applied in the field of geotechnical engineering, can solve problems such as lack of

Active Publication Date: 2018-05-11
WUHAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For now, there is a lack of scientific soft rock filling material degradation test equipment and test methods in the norms and actual projects to determine these important design and construction parameters

Method used

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  • Testing equipment and test method for soft rock filling deterioration
  • Testing equipment and test method for soft rock filling deterioration
  • Testing equipment and test method for soft rock filling deterioration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The thickness of the protective layer is studied through degradation test and particle test. The dry-wet cycle of sodium sulfate solution is used to simulate the effect of degradation on the powdering of soft rock fillers. The existing medium-sized triaxial apparatus is modified to realize the triaxial stress state. Indoor simulation technology for the effects of degradation. Define the weathering rate of the soft rock filler, carry out the degradation simulation test under different confining pressure conditions, establish the relationship between the weathering rate and the confining pressure, and determine the optimal protective layer of the soft rock filler according to the equivalent relationship between the restraining pressure and the overburden layer thickness.

[0045] The specific test method is as follows:

[0046] (1) Prepare triaxial specimens according to the determined gradation, design density or compaction (here 95% compaction is used), and optimal moisture...

Embodiment 2

[0059] Through the triaxial degradation simulation test, the triaxial shear test after the soft rock filler is fully degraded is carried out to obtain the stress-strain relationship under different confining pressures, and the failure deviatoric stress. Analyze the law of strength attenuation rate and the attenuation rate of deformation modulus under 50% stress level, establish the quantitative relationship between compaction, strength attenuation rate, and modulus attenuation rate, and use strength attenuation rate or modulus attenuation rate threshold as the criterion , To determine the control index of the degree of compaction of the soft rock filler. The principle of parameter selection after the deterioration of the mechanical properties of materials is proposed.

[0060] The specific test method is as follows:

[0061] (1) Prepare triaxial samples according to the determined gradation, design density or compaction degree, and optimal moisture content, and the samples are not...

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Abstract

The invention discloses testing equipment and a test method for soft rock filling deterioration. The testing equipment comprises a three axis instrument and a sample, and further comprises a hot air inlet system, a pumping and exhaust system, a backpressure system and a confining pressure system with external body variable measurement; the hot air inlet system is located at the bottom of the sample, the pumping and exhaust system is located at the top of the sample, the backpressure system is located at the bottom of the sample, the confining pressure system with external body variable measurement is located in a three axis pressure chamber and outside the sample. According to the testing equipment and the test method for soft rock filling deterioration, a deterioration simulation test under different confining pressure conditions is carried out, the relationship between the weathering rate and the confining pressure is established, and the optimum thickness of a protective layer for soft rock filling is determined. Through a three axis degradation simulation test, a three axis shear test for soft rock filling after full deterioration is carried out, the stress-strain relationship,failure bias stress, constitutive parameters and strength parameters and the like under different confining pressures are obtained. According to the mechanical properties of soft rock filling under different compaction degree conditions, the optimum compaction degree of soft rock filling is determined.

Description

Technical field [0001] The invention belongs to the technical field of geotechnical engineering, and specifically relates to a soft rock filler deterioration test equipment and a test method. Background technique [0002] Soft rock fillers are prone to breakage due to low particle strength. Compared with hard rock, its mechanical nonlinear characteristics are more significant. Under the action of long-term dry-wet cycles of water, its modulus and strength will attenuate and deteriorate. Existing standards require that the porosity of hard rock fill materials of roller compacted earth-rock dams is 20%-28%. For soft rock fill materials, the porosity should be determined according to the requirements of building deformation, stress and shear strength. For soft rockfill materials, considering that soft rock fillers are prone to particle breakage, if the compaction requires a smaller porosity, the block rock materials are easily broken into medium and small particle sizes, which will ...

Claims

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Application Information

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IPC IPC(8): G01N3/24
Inventor 黄斌齐添刘先荣张焕亨张雨廷傅旭东温嘉华韩洪兴陈伟吕布杨之俊贺云韦秀东余保汶
Owner WUHAN UNIV