西南某水电站坝前堆积层斜坡变形预测与预警  

Study of prediction and early warning of slope deformation of accumulation layer in front of a hydropower station dam in Southwest China

作　　者：周辀 沈军辉[1] 舒俊城 段伟锋 杨日昌 李颖 ZHOU Zhou;SHEN Junhui;SHU Juncheng;DUAN Weifeng;YANG Richang;LI Ying(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China;Power China Huadong Engineering Corporation Limited, Hangzhou 310000, China)

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),成都610059 [2]中国电建集团华东勘测设计研究院有限公司,杭州310000

出　　处：《成都理工大学学报（自然科学版）》2020年第4期481-491,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金项目(41572308);中国电建集团华东勘测设计研究院有限公司科研基金资助项目。

摘　　要：探讨西南河谷地区堆积层斜坡变形预测与预警研究的方法和思路。在掌握某堆积层斜坡变形机制的基础上,建立地质-力学-变形模型,运用强度折减有限差分计算和优化位移切线角法预测该变形体破坏时的临界位移和临滑变形速率,并结合斜坡的时间-空间演化规律,得到其预警综合判据。结果表明,该变形体后缘和前缘的临界位移值分别为6.69 m和0.449 m,且后缘的临滑变形速率为0.109 m/d,而变形经历了初始变形——后缘拉裂缝形成阶段和等速变形——中段侧翼剪张裂缝产生阶段,尚未进入加速变形——前缘隆胀裂缝形成阶段。根据定量预测参数和定性演化规律所划分的变形-破坏4级预警指标提高了该变形体变形预测预警的可靠性。On the basis of understanding of slope deformation mechanism for a certain accumulative formation in the southwest China,a geology-mechanics-deformation model is established in order to discuss the methods and ideas of slope deformation prediction and early warning.Strength reduction finite difference calculation and optimization of the tangent angle method are used to predict the critical displacement and velocity slip deformation rate of the displacement deformation damage.The early warning and comprehensive criterion are obtained through the recognition of time and space evolution law of slope.It shows that the critical displacement values of the trailing edge and leading edge of the deformed body are 6.69 m and 0.449 m,respectively,and the near-slip deformation rate of the trailing edge is 0.109 m/d.The accumulative formation experienced the following stages:initial deformation stage;the formation of the trailing edge tensile crack and the constant velocity deformation stage;the flanking shear crack generation stage in the middle segment prior to the accelerated deformation and swelling crack formation stage in leading edge.According to the quantitative prediction parameters and the qualitative evolution law,a 4-level deformation and failure warning index are proposed so as to improve the reliability of deformation prediction and early warning for the deformable body.

关 键 词：斜坡变形 地质-力学-变形模型 临界位移 临界变形速率 演化规律 预警判据 

分 类 号：P642.22[天文地球—工程地质学]