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The deep alluvium supplies inadequate dewater the bottom of the aquifer , resulting in the soil consolidation settlement to cause vertical additional force due to the formation and borehole subsidence is not synchronized , the outer surface of the wellbore , along with the wellbore depth increases, the force is gradually increasing in the borehole wall , in the soil and the bedrock junction reaches the maximum when the borehole wall strength of these principles are violated in the multi- force conditions , giving rise to the pressure of the borehole wall crack damage accidents . The borehole wall in the complex loading conditions damage the paper so the research background . Rock mechanics test system based in Henan Polytechnic University , and a high - stress simple shear test system , the system by the host , the measurement system , control system and data processing system composed of four parts , automatic loading , automatic control , data real-time acquisition , dynamic display, draw charts and other functions . In this experimental system , carried out a series of gravelly sand, coarse sand , medium sand , fine sand with steel , concrete interface high stress simple shear tests . According to the test results obtained interfacial shear stress - shear displacement relationship , volumetric strain shear displacement relationship under high stress interface constitutive relation, the interface unit and the strength of the interface guidelines discussed on this basis ; through positive cross - test data analysis of variance and intuitive analysis to explore the influencing factors of the interface shear strength, initial shear stiffness and interface particle breakage degree . A preliminary analysis of the impact of water content on the shear properties of the contact surface , and further research suggestions are proposed .
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