基于卸荷的如美水电站高陡边坡开挖时步响应

摘要

It established two-dimensional model of high and steep slope by selecting the typical cross-section of the stilling basin of Rumei Hydro-power Plant,calculated the deformation of the slope of each key point in different excavation steps by using FLAC3D software and analyzed the influ-ence of different excavation steps to the left and right bank slope displacement. Finite element analysis and numerical simulation results show that considering the damage of rock mass under different excavation steps in stilling high steep rock slope excavation process,rock failure region along with the advance of the excavation steps is a growing process,when the excavation is in a certain step,the key points of slope deformation and de-formation rate increase significantly;slope surface rock fragments or debris are sensitive in the process of excavation,supporting is needed before excavation and verification is before the construction.%通过选取如美水电站消力池典型剖面建立高陡边坡二维模型，使用FLAC3D软件计算该边坡在开挖过程中在不同开挖时步下各关键点的位移，分析不同开挖时步对左右岸边坡位移的影响。有限元分析和数值模拟结果表明：消力池高陡边坡岩体开挖过程中，考虑了不同开挖时步下岩体的破坏情况，岩体破坏区域随着开挖步骤的推进是一个不断增大的过程，当开挖到一定步骤时，边坡关键点的变形和变形速率明显增大；开挖过程中，坡表碎裂岩体或堆积体较为敏感，开挖前需要进行支护，验证后，方能动工。