水位升降速度对岩质岸坡变形及稳定性的影响  

Effects of Water Level Variation Velocity on Deformation and Stability of the Rock Bank Slope

作　　者：余志刚[1,2,3] 莫勇刚 蒋博林 阴可 YU Zhigang;MO Yonggang;JIANG Bolin;YIN Ke(School of Architecture Engineering,Chongqing Vocational Institute of Engineering,Chongqing 402260,China;College of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area of MOE,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆工程职业技术学院建筑工程学院,重庆402260 [2]重庆大学土木工程学院,重庆400045 [3]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《人民黄河》2018年第12期142-147,共6页Yellow River

基　　金：重庆市教委科学技术研究项目(KJ1603204);长江学者和创新团队发展计划资助项目(IRT1045)

摘　　要：为研究水位升降速度对岩质岸坡变形及稳定性的影响,以某水库高陡边坡的库水位升降为背景,采用Geo-Studio系列有限元分析软件,对库水位升降进行了全过程缓变、全过程急变、单独急速降水及单独急速升水4种条件下的流固耦合数值模拟,研究库水位升降全过程中升降速度对岸坡岩体变形位移、"近似蠕变"及稳定安全系数的影响效应,单独升、降库水位条件下升降速度对岸坡岩体变形位移、稳定安全系数的影响规律。结果表明:增大库水位升降全过程速度对观测点位移极值、敏感性及变化普遍规律几乎无影响,但对位移变化速率影响较大,"近似蠕变"规律与各测区整体位移变化规律类似,但其位移曲线斜率较大,稳定安全系数在水位上升阶段及最高恒水位阶段整体表现较大,在下降阶段及最低水位阶段整体表现较小;增大单独下降速度时,位移极值几乎一致,稳定安全系数较小,曲线斜率较大;增大单独升高速度时,位移极值几乎一致,稳定安全系数较大,曲线斜率较大;岸坡稳定性评价应将稳定安全系数与观测点位移综合起来分析。In order to study the influence of water level variation velocity on deformation and stability of the rock bank slope,taking the reser-voir water fluctuation of one high and steep slope project as the background,by using finite element analysis software of Geo-Studio series tomake coupled fluid-solid numerical simulation tests under four conditions of water level slow change in whole process,water level rapid changein whole process,separate rapid falling and rising,the paper studied the effects of water level variation velocity on deformation displacement,“approximate creep”and stability safety factor of bank slope rock mass during the whole process of water level fluctuation as well as water lev-el variation velocity on deformation displacement and stability safety factor in separate falling or rising. The results show that the increase ofwater level variation velocity in whole process,has little effect on the displacement extreme value,sensitivity and change universal rule of ob-servation points,a greater impact on the change rate of displacement. The law of “ approximate creep” is similar to the overall displacementanalysis for each region,but the slope of displacement curve is larger. The overall performance of bank slope safety coefficient at the rising ofwater levels or at the maximum constant water levels is relatively large and at the rising of water levels or at the minimum water levels is rela-tively small. When the separate falling velocity increases,the extreme value of displacement is almost the same,the stability factor is smaller,and the slope of the curve is larger. When the separate rising velocity increases,the extreme value of displacement is almost the same,the sta-bility safety factor is larger,and the slope of the curve is larger. The stability of bank slope should be determined by the comprehensive analy-sis and evaluation of the stability safety factor and the displacement of the observation points.

关 键 词：岩质岸坡 水位升降 变形 位移 岸坡稳定性 

分 类 号：TV139.1[水利工程—水力学及河流动力学] TU457[建筑科学—岩土工程]