摘要
锦屏一级水电站左岸大型人工开挖边坡的变形和稳定性直接关系到水电站蓄水期和运行期的正常运行。而为了研究左岸边坡蓄水后的变形响应特征,通过对左岸边坡前期丰富的地质资料的分析将其分为3个不同的变形区域,再结合库水位历时曲线对各区域监测点的变形数据进行整理和分析。研究结果表明左岸边坡的持续变形与库水位有着较强的相关性,但是不同变形区域有着各自的特征。高位倾倒变形区主要是以沉降变形和横河向的位移为主倾倒变形受坡体自身的岩体组成、岩体结构和表生构造所控制。蓄水以后下部岩体和结构面的劣化导致变形保持稳定增长。断层f5、f8残留变形区主要受2条断层和岩体开挖卸荷作用的影响。蓄水以后受库水浮托力和水平推力的影响较大,蓄水水位1 880 m附近的点受蓄水影响出现小幅度的上抬。拱肩槽上游开挖边坡变形区主要受岩体开挖卸荷作用以及F42-9断层、煌斑岩脉所控制,在蓄水以后低高程的点和二区监测点一样受库水浮托力和水平推力的影响较大,其余更高高程的点仍然以沉降为主,总位移的方向指向上游,并且库水位历时曲线与变形曲线呈现出峰—谷对应的特征。目前各区域监测点的变形虽然速率不大但仍未收敛,需要持续的监测与关注以及进一步的研究。
The deformation and stability of the large artificial excavation slope on the left bank of Jinping I Hydropower Station are directly related to the normal operation of the hydropower station during the storage period and the operation period. In order to study the deformation response characteristics of the left bank slope after impoundment, this paper divides the left bank slope into three different deformation regions through an analysis of abundant geological data in the early stage, and then the deformation data of monitoring points in each region are collated and analyzed on the basis of the reservoir water level diachronic curve. The results show that there is a strong correlation between the continuous deformation of the left bank slope and the reservoir water level, but different deformation regions have their own characteristics. The deformation of the high-level toppling deformation area maintains a stable growth after an impoundment, and the curve of horizontal displacement and vertical displacement presents the characteristics of peak-valley correspondence. At present, although the deformation rate of monitoring points in each region is not very high, it still has not converged, and needs continuous monitoring and attention and further research.
作者
裴向军
何如许
朱利君
罗小惠
陈俊宇
PEI Xiang-jun;HE Ru-xu;ZHU Li-jun;LUO Xiao-hui;CHEN Jun-yu(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《中国农村水利水电》
北大核心
2019年第10期139-147,共9页
China Rural Water and Hydropower
基金
国家重点研发计划课题“特高拱坝及近坝库岸长期安全稳定运行”(2016YFC0401908)
国家创新性集体基金“西部地区重大地质灾害潜在隐患早期识别与监测预警”(41521002)
关键词
水电站蓄水
边坡变形响应
边坡位移监测
水电站人工开挖边坡
hydrowpower station impoundment
slope deformation response
displacement monitoring
excavated manually slope of a hydropower station
