Study on deformation and failure evolution of rock slope under unloading conditions
In order to explore the deformation and failure characteristics of slope with different height under excavation and unloading conditions,taking the geological characteristics of Jiangjungebi No.1 Open-pit Mine as an example,the characteristics of crack propagation and slip deformation under excavation and unloading are analyzed by using borehole observation and displacement monitoring.The deformation and failure laws of 200 m and 400 m rock slopes were investigated by using similar simulated bottom friction tests,and the fracture development and horizontal displacement evolution laws were analyzed under the conditions of excavation relief.The results show that the 200 m rock slope causes tensile cracks under the action of gravity,and the cracks extend under the traction of the lateral slope body.After the cracks are connected,a sliding failure mode is formed.The fracture failure mode is mainly compressive crack caused by tensile shear compound failure type.The deformation and failure of 400 m slope is divided into upper and lower parts.The deformation and failure trend of the upper part is the same as that of the 200 m slope.The deformation of the lower part is mainly caused by cracks caused by pressure relief and relaxation,and the sliding failure form is formed under the pushing and pulling action of the upper slope.
rock slopeslope deformationexcavation unloadinganalog simulationslope stabilitydisplacement monitoring
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