蓄水与施工作用下滑坡变形机制与稳定性分析.pdf

Journal of Engineering Geology工程地质学报1004-9665/2014/22(3)-0386-10
DOI:10.13544/j.cnki.jieg.2014.03.006
蓄水与施工作用下滑坡变形机制与稳定性分析
卢永兴肖建章的许冲谢启智袁华的
(①中国科学院地质与地球物理研究所北京100029)
(②中国科学院大学北京100049)
(3③中国水利水电科学研究院流域水循环模拟与调控国家重点实验室北京10008)
(④中国地震局地质研究所活动构造与火山重点实验室北京100029)
(⑤中南勘测设计研究院长沙410014)
摘要向家坝水电站一期蓄水后,刚刚完成挖填方工程的307省道复建公路所途经的观音坪滑坡发生明显变形,滑坡变形
究竟是蓄水触发还是复建公路施工触发存在着较大争议。本文基于滑坡变形特征与现场监测结果,探讨了该滑坡的变形机
制。通过有限元数值模拟对该滑坡的稳定性进行分析,采用强度折减法计算出不同工况下滑坡的安全系数。计算结果表明:
(1)复建公路施工和库水位上涨都不利于滑坡整体稳定,而且库水位上涨对滑坡稳定性的影响程度更大;(2)施工结東,且水
库蓄水至354m后,滑坡已接近临界稳定状态;如不采取措施,库水位上升至二期菩水位370m和正常蓄水位380m时,安全系
数将进一步降低;(3)对该滑坡采取削坡减载治理揹施后,滑坡在二期蓄水位和正常蓄水位的条件下安全系数均满足规范的
要求,分析成果可为同类滑坡防治提供参考。
关键词库岸滑坡复建公路施工水库蓄水变形机制稳定性
中图分类号:P642.22文献标识码:A
DEFORMATION MECHANISM AND STABILITY ANALYSIS OF
LANDSLIDE UNDER IMPOUNDMENT AND CONSTRUCTION
LU Yongxingda XIAO Jianzhang XU Chong"XE Qizhis) YUAN Hu.
( Oinstitue of Geology and Geophysics, Chinese Academy of Sciences, Bejing 100029
(2university of Chinese Academy of Sciences, Beiing 100049)
(State Key Bora oy of mlt n and Re utn of aer cle in River Basin, China Institute of Water Resources and
R
ing100038)
(@Key Laboratory of Active Tectonics and Volcano, Institute of Geology, Chinese Ear uake Administration, Be jing 100029
(6)Zhongnan Engineering Corporation, Changsha 410014)
Abstract The Guanyinping landslide turned up evident deformation. There were two possible cause factors. One is
the first-stage impoundment of Xiang aba hydropower station and the other is the rebuilding construction of the the
307 provincial road whose cutting and filling project had just been finished. The real cause triggering the landslide
deformation remains to be controversial between the reservoir impoundment and the construction of the rebuilt road
Based on the landslide deformation behaviors and the results of in-situ monitoring, the deformation mechanism of
*收稿日期:2013-02-11;收到修改稿日期:2014-04-10.
基金项目:国家973项目(2014CB04700)和国家自然科学基金资助项目(41202235)资助
第一作者简介:卢永兴,男,硕士研究生,主要从事地质灾害评估,岩土工程数值计算方面研究.Email:Jiemncuncun163.com