Test and analysis method of geotechnical media tension-shear strength

Abstract

The present invention discloses a test and analysis method of geotechnical media tension-shear strength, and relates to geotechnical media tension-shear technology. The structure of the device is as below: a specimen (1) is installed in a holder (2); an axial pressure system (3) is connected to the specimen (1), and used for loading and recording axial pressure; an internal pressure system (4) is connected to the specimen (1), and used for loading and recording internal pressure and a tension-shear point capture device (5) is connected to the specimen (1) to achieve capture of the tension-shear point. The main steps of the method are as below: using a thick-walled cylinder-type crack instrument to achieve a geotechnical tension-shear failure test; calculating tension-shear strength; and drawing a tension-shear curve. The present invention has the advantages of simple experiment operation, high degree of automation and good repeatability. The method can be applied almost without modification to rock media compression shear strength test, and expands the scope of application of a traditional thick-walled tube fracturing experiment technology.

Description

technical field [0001] The invention relates to rock-soil medium tensile-shear technology, in particular to a test and analysis method for rock-soil medium tensile-shear strength. Wherever the combined stress state of tension and shear may appear in geotechnical engineering, it is a potential application field of this technology, such as shaft engineering, anchor engineering, tunnel engineering, slope engineering and underground powerhouse. Background technique [0002] Many geotechnical engineering practices increasingly show that the stress path and stress state suffered by rock and soil are extremely complex, and the different paths of unloading and loading may cause the rock and soil medium to be in a state of tension-shear stress, so there are more and more occasions where tension-shear failure occurs . For example, in underground projects such as mining, tunnels and underground powerhouses, due to the heterogeneity and inelasticity of rock and soil, the unloading stre...

AI Technical Summary

Problems solved by technology

Due to the lack of systematic proofreading of theoretical models and experimental data due to the lack of test data on tension and shear, there are few studies on the test methods of tensile and shear strength of rock-soil media, and most of the existing research results are cumbersome and difficult to operate. Not high, needs to be improved

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