摘要
以岩溶地区深厚覆盖层上采用土工膜全库盆防渗的仙女山水库为例,采用非线性有限元法分析该水库库盆土体和复合土工膜的应力变形规律,研究复合土工膜在运行情况下的安全性。研究结果表明,蓄水期该水库库盆土体以沉降变形为主,同时两侧土体向库盆中部发生变形,库盆土体变形分布较为均匀;在库盆覆盖层变形的影响下,库盆两侧土工膜呈拉伸状态,库盆中部土工膜呈压缩状态,土工膜的抗拉和应变安全系数均大于5.0,土工膜可以适应下伏土体的变形,且有一定的安全裕度。
Taking Xiannvshan Reservoir with deep overburden under the reservoir basin for example,we carried out a nonlinear finite element calculation on the stress and deformation of composite geomembrane used as the seepage prevention for the whole reservoir basin to analyze the safety of composite geomembrane. The result indicate that under the water pressure during operation period,settlements occur in overburden under the reservoir basin. Meanwhile,horizontal deformation from both banks slope towards the center of the reservoir. The deformation are well-distributed. According to the influence of the deformation,the composite geomembrane at the both banks slope is in tension,while composite geomembrane at the center of reservoir is in compression. The tensile safety factor and strain safety factor are both more than 5.0. The composite geomembrane can fit the deformation of overburden and be with a certain safety margin.
作者
孔凡辉
花俊杰
王丽华
黄元
KONG Fan-hui1, HUA Jun-jie1, WANG Li-hua2, HUANG Yuan1(1. Changjiang Survey Planning Design and Research Co., Ltd., Wuhan 430010, China; 2. Wulong District Water Authority of Chongqing City, Wulong 408500,Chongqing, Chin)
出处
《中国农村水利水电》
北大核心
2018年第5期152-155,共4页
China Rural Water and Hydropower
基金
国家重点研发计划资助项目(2017YFC0404804)
关键词
全库盆防渗
复合土工膜
应力变形
深厚覆盖层
seepage prevention for whole reservoir basin
composite geomembrane
stress and deformation
deep overburden
