摘要
黄金峡水利枢纽大坝左岸Ⅰ区边坡开挖施工阶段发现了多条断层和多组裂隙,出现了多次变形突变现象,呈台阶状跳跃增长,且变形大多位于深部10~30m,局部累计监测变形值超过100mm。根据地质、监测及坡表开裂等资料综合分析影响边坡变形的关键因素,并采用三维数值计算方法论证加固效果,复核边坡稳定性。结果发现Ⅰ区边坡是典型的结构控制型边坡,变形范围及深度与结构面fz39、L920位置吻合,变形破坏模式主要是结构面fz39、L920构成的块体KT21滑动破坏。现状条件下边坡已接近临界状态,考虑削坡减载和边坡中下部增加大吨位锚索后,边坡安全性得到显著提升。研究结果丰富了边坡稳定性研究的工程实例,为工程自身建设提供了重要的技术支撑。
During the construction stage,the faults and fissured structural planes were found on the left bank slope in zone Ⅰ of Huangjinxia water conservancy project.Multiple abrupt deformation of slope occurred,and most was located in the deep part.Some of the measured values were more than 100 mm.Based on the analysis of the geological conditions,monitoring data and deformation phenomenon,it is found that the slope is a typical structural plane controlled slope.The deformation mode of slope is mainly the sliding deformation of block KT21 formed by the combination of fz39 and L920.The three-dimensional numerical calculation shows that the slope is close to the critical state under the current condition.Considering the load reduction at the top of slope and the increase of large tonnage anchor cable,the safety factor of slope is significantly improved.The research results enrich the case study of structural plane controlled slope and provide important technical support for the project.
作者
曹双利
胡中平
丁秀丽
黄书岭
王辉
吴勇进
CAO Shuang-li;HU Zhong ping;DING Xiu-li;HUANG Shu-ling;WANG Hui;WU Yong-jin(Hanjiang to-Weihe River Valley Water Diversion Project Construction CO.,LTD.,Xi'an 710010,China;Changjiang Institute of Survey Planing Design and Research,Wuhan 430010,China;Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changiang River Scientific Research Institute,Wuhan 430010,China)
出处
《水电能源科学》
北大核心
2021年第2期114-118,共5页
Water Resources and Power
基金
国家重点研发计划(2017YFC1501303,2017YFC1501305)。
关键词
岩石边坡
结构面
变形突变
开裂
数值计算
黄金峡水利枢纽大坝左岸Ⅰ区
rock slope
structural plane
deformation mutation
cracking
numerical calculation
left bank slope in zoneⅠof Huangjinxia water conservancy project
