工程地质学报2016，Vol.24Issue(5)：752-759,8.DOI:10.13544/j.cnki.jeg.2016.05.004
平缓细粒土岸坡水库塌岸机理研究
COLLAPSE MECHANISM OF GENTLE INCLINED AND FINE-GRAINED SOIL SLOPE ON RESERVOIR BANK
张景顺 1张世殊 1周光明 1徐旭 1冯建明1
作者信息
- 1. 中国电建集团成都勘测设计研究院有限公司 成都 610072
- 折叠
摘要
Abstract
Engineering practice and statistics show that reservoir bank collapse usually occur in loose accumulation when slope is greater than 1 5 degrees.Reservoir bank collapse is small possibility when bank slope is 1 0 degrees or so.But it happens in Qiaoqi hydropower station reservoir area on Sichuan Baoxing River.As an factual example, the Mahuang valley 5 # accumulation body is composed of gravelly clay.Particle size of less than 0.075mm is accounted for about 60%.The collapse mode of reservoir bank is slow creeping deformation after impoundment. Deformation range gradually expands backward.After more than nine years,deformation continues.This paper takes Mahuang valley 5 # accumulation body as an example.It is on the basis of exploration and test work about soil structure and soil particle composition,reservoir operation mode and deformation monitoring results,and coupling analysis of finite element analysis of transient seepage and stability analysis.It studies the collapse mechanism of gently inclined slope on reservoir bank.The results show that fine-grained soil structure and weak water permeability are the main causes of accumulation of creep deformation in Qiaoqi reservoir area.The gently inclined slope stability and the periodical change of water level have an obvious correlation.With the rise and fall of water level change, the reservoir bank presents different steady states and the creep deformation rate differently.关键词
水库塌岸/蠕滑/砾质黏土/瞬态渗流分析/变形监测Key words
Reservoir bank collapse/Creep/Gravelly clay/Transient seepage analysis/Deformation monitoring分类
天文与地球科学引用本文复制引用
张景顺,张世殊,周光明,徐旭,冯建明..平缓细粒土岸坡水库塌岸机理研究[J].工程地质学报,2016,24(5):752-759,8.
