Stability Evaluation of Reservoir Bank Slope after Excavation and Unloading
Taking the slope of a hydropower station in western China as the study object,based on the mass mechanics theory of unloaded rock,the model of the reservoir bank slope considering faults is constructed by numerical simulation method,and the simulation analysis of different working conditions is carried out,and the distribution of stress,deformation and plastic zone is comprehensively calculated,so as to evaluate the overall stability of the slope.The results show that:the slope is the most unstable under the condition of water storage superim-posed with seismic conditions,and the tensile stress value of the third principal stress is the highest under seismic conditions,which is 1.324 MPa;Water storage and excavation deteriorate the parameters of the slope rock mass,which has a great impact on the scope of the plastic zone;Seismic action has a great impact on the depth of the plastic zone,and the plastic zone is prone to expand along the distribution direction of weaker materials;The deterioration of the rock mass caused by water storage and excavation amplifies the response of the slope to seismic;In the most unfavorable condition,the area of the plastic zone is increased by 2.2 times compared with the excavation condition;The through surface calculated by the strength reduction method is mainly distributed within the fault,between the rock masses of the fault,be-tween the fault and the foot of the slope,and between the fault and the top of the slope;The excavation removed part of the strong regolith layer,which improved the stability of the slope,and the stability coefficient is the lowest under the seismic condition of water storage super-position,which is 1.59.
slope engineeringexcavation and unloadingslope stability evaluationnumerical simulationstrength reduction
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