水利水电科技进展2012，Vol.32Issue(6)：84-86,3.DOI:10.3880/j.issn.1006-7647.2012.06.021
库水位骤降对非饱和坝坡稳定性的影响
Influence of rapid drawdown of reservoir level on stability of unsaturated dam slope
摘要
Abstract
The reduction of the safety factor caused by the rapid drawdown of the reservoir level leads to the instability of the dam slope. Therefore, it is important for reservoir flood control and irrigation to research influences of different drawdown velocities of the reservoir level on the dam slope stability. With consideration of the effects of unsaturated transient seepage on the stability of the dam slope, the process of the excess pore water pressure was simulated using the limit equilibrium method based on the shear strength theory for unsaturated soil and the nonlinear relationship between the volume water content and matric suction. Then, the seepage analysis results for different times were incorporated into the stability analysis module to calculate the safety factor of the dam slope. The calculated results show that rapid drawdown of the reservoir level can result in a decrease of the dam slope safety factor, and the faster the drawdown of the reservoir level is, the smaller the safety factor will be. However, the stability of the dam slope was enhanced with the dissipation of excess pore water pressure. The simulation method can provide a theoretical basis for determining the flood discharge during reservoir flood control operation.关键词
库水位骤降/非饱和渗流/非稳定渗流/浸润线/坝坡稳定/敏感性参数Key words
rapid drawdown of reservoir level/unsaturated seepage/transient seepage/seepage line/dam slope stability/sensitivity parameters分类
建筑与水利引用本文复制引用
钟启明,霍家平,刘若星..库水位骤降对非饱和坝坡稳定性的影响[J].水利水电科技进展,2012,32(6):84-86,3.基金项目
国家自然科学基金(51109141) （51109141）
中央级公益性科研院所基本科研业务费专项(Y312001) （Y312001）
