Stability Analysis of Foundation Pit Slope of GIL Pipe Gallery of Substation Based on ABAQUS
With its advantages of safety and reliability,GIL pipe gallery is widely used in the construction of urban substations.The premise of the safe construction of the GIL pipe gallery is to ensure the stability of the slope of the excavation foundation pit.Based on the Mohr-Coulomb strength criterion,ABAQUS was used to simulate the deformation of the slope excavated in the GIL pipe gallery of the upper and lower soft and hard strata,and the in-situ stress balance method and the strength reduction method were used to determine the slope safety factor,so as to verify the rationality of the engineering support scheme,and then analyze the slope instability mechanism,which provided a reference for the prediction of slope stratum deformation and the determination of the support scheme.The results are as follows.ABAQUS can effectively simulate the strength reduction.The maximum displacement of the slope after reinforcement is reduced by 60.5%,the land subsidence no longer occurs,and the safety factor is increased from the original 0.987 to 1.527,an increase of 54.7%.When the slope of the upper soft and lower hard strata is excavated,the upper soft soil layer forms a plurality of potential slip surfaces distributed according to the strata,and the lower rock strata will form an extrusion effect on the slope foot in a wedge-shaped slip mode.
GIL pipe gallery of substationsoft and hard strata at the topfoundation pit slope stabilityABAQUS numerical simulationstrength reductioninstability mechanism
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