摘要
以金沙江中游梨园电站坝前大型土石混合体边坡为例,基于精细地质结构模型,研究其在蓄水及库水位骤降过程中的流-固耦合及相应的稳定性变化特征。结果表明:蓄水初期边坡地表变形较为缓慢,当库水位达到某一高程时,其地表变形呈现陡增趋势;在蓄水初期边坡的稳定性有所下降,当上升至某一临界水位后边坡稳定系数达到最低值,而后随着库水位的上升有所回弹;库水位骤降对边坡稳定性影响较大,且其稳定系数下降随着骤降幅度的增大而增大。这些对于指导实际工程及深化库区土石混合体边坡的研究具有一定的理论意义。
Taking a soil-rock mixture slope in the middle reaches of Jinsha River for example, the fluid-solid coupling and stability characteristics during rising and drawdown of reservoir water levels are studied based on its fine geological structure model. The results indicate that during the initial impoundment period, the deformation of the ground surface is very slow, while the reservoir water level reaches certain elevation it exhibits a trend of sharp rise; the safety factor of the slope stability will decrease; and when the water level reaches a critical one it has the minimum value; hereafter it will rise with the water level rising; the sudden drawdown of the reservoir water level does affect the stability of the slope greatly; and the decreasing value of the safety factor will increase with the amplitude of the drawdown of the water level. All these results will be very useful not only for the practical engineering but also for the theoretical study of the soil-rock mixture slopes in reservoir area.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2009年第7期1491-1498,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
中国科学院地质与地球物理研究所工程地质力学重点实验室开放课题
地质灾害防治与地质环境保护国家重点实验室开放基金项目(GZ2007-10)
第44批博士后一等资助基金项目(20080440047)
关键词
边坡工程
土石混合体边坡
强度折减法
库水位升降
流-固耦合
稳定性分析
slope engineering
soil-rock mixture slope(S-RMS)
strength reduction method
rising and drawdown of reservoir water level
fluid-solid coupling
stability analysis