摘要
为深入认识向家坝水电站左岸近坝边坡的抬升变形现象,利用流固耦合数值试验研究了岩体的扩容变形机理,在此基础上采用流固耦合数值分析方法对向家坝水电站左岸近坝边坡的抬升变形过程进行了数值模拟,得到了近坝边坡抬升变形的空间分布,并对泄压孔泄压对抬升变形的控制效果进行了评价。结果表明:岩体扩容体积应变随岩体渗透系数增大而增大,随变形模量增大而减小,岩体初始应力对抬升变形的影响微弱;渗流场改变是引起近坝边坡抬升变形的直接诱因,边坡抬升变形是岩土体内渗流场和应力场相互作用的结果,采用流固耦合理论揭示近坝边坡的抬升变形机制是合理的;深层泄压孔可以有效控制近坝边坡的抬升变形量。
To further understand the uplift defor^nation phenomenon that occurs at the left bank slope near the dam of Xiangjiaba Hydropower Station,hydro-mechanical coupling numerical tests were used to study the mechanism of rock mass expansion and deformation. Based on the hydro-mechanical coupling analysis,the uplift deformation process w,as simulated. The spatial distribution of the deformation was obtained and the control effect of the pressure relief holes on the uplift deformation was evaluated. The results indicate that the volume expansion strain of the rock mass increases with the permeability coefficient and decreases with the increase of deformation modulus. The initial stress has little effect on uplift deformation. Variation of the seepage field is the direct cause of uplift deformation and the uplift deformation is also the result of the interaction between seepage field and stress field. It is reasonable to use hydro-mechanical coupling theory to reveal the uplift deformation mechanism. Deep drainage holes for pressure relieving are effective for the controlling of the uplift deformation.
作者
蒋中明
李双龙
冯树荣
钟辉亚
李学政
曾祥喜
JIANG Zhongming;LI Shuanglong;FENG Shurong;ZHONG Huiya;LI Xuezheng;ZENG Xiangxi(School of Hydraulic Engineering,Changsha University of Science ＆ Technology,Changsha 410004,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410004,China;PowerChina Zhongnan Engineering Co.,Ltd.,Changsha 410014,China)
出处
《水利水电科技进展》
CSCD
北大核心
2018年第4期64-69,94,共7页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金(50778070)
关键词
边坡
抬升变形
泄压孔
流固耦合理论
数值仿真
向家坝水电站
slope
uplift deformation
pressure relief hole
hydro-mechanical coupling theory
numerical simulation
Xiangjiaba Hydropower Station
