Effect of Excavation Conditions on the Stability of Landslide Deposits with Different Deposit-Bedrock Interfaces
Investigating the effect of excavation conditions on the stability of landslide deposits with different forms of deposit-bedrock interface,and providing references for large-scale excavation of landslide deposits.ABAQUS software was used to carry out numerical simulations of landslide deposits at the quasi-linear and chair-like deposit-bedrock interfaces.First,the deformation characteristics of landslide deposits before and after excavation,as well as the impact of excavation on the safety and stability of landslide deposits were analyzed.Secondly,the influence law of excavation on the stability of landslide deposits was analyzed via an orthogonal test.Finally,the optimal excavation scheme was obtained.The optimal excavation combination of landslide accumulation at the interface of quasi-linear linear foundation and cover is 150 m in excavation position,20 m in width of excavation building platform,110 ° in excavation angle,and 7.5 m in vertical height of adjacent excavation platform.The optimal excavation scheme for the landslide accumulation at the interface of the chair foundation is 250 m.The optimal width of the excavation building platform is 25 m,the excavation angle is 130 °,and the vertical height of the adjacent excavation platform is 15 m.The morphology of the deposit-bedrock interfaces significantly affects the excavation plan and the stability of the landslide deposits.It is preferable to excavate in the middle of the landslide deposits at the quasi-linear base-bedrock interface,while it is preferable to excavate in the back edge of the landslide deposits at the chair-shaped base-bedrock interface.
morphology of the deposit-bedding interfaceexcavation conditionsstabilitynumerical simulationstrength reduction method
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