【作者】 刘金龙； 栾茂田； 袁凡凡； 王吉利；

【Author】 LIU Jin-long~1,LUAN Mao-tian~(1,2,3),YUAN Fan-fan~1,WANG Ji-li~1 (1.Institute of Rock and Soil Mechanics,The Chinese Academy of Sciences,Wuhan 430071 China) (2.State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024 China) (3.School of Civil and Hydraulic Engineering,Dalian University of Technology,Dalian 116024 China)

【机构】 中国科学院武汉岩土力学研究所； 大连理工大学海岸和近海工程国家重点实验室； 大连理工大学土木水利学院岩土工程研究所；

【摘要】 在假定坡体孔隙水水位为水平线且不考虑渗透作用影响的基础上,基于极限平衡法考察了水位下降对边坡安全系数的影响。对比计算表明:在水位缓慢下降即坡体内外水位线等高的情况下,边坡的安全系数随着水位的降低先大幅度减小后有一定的增加,且在水位坡高比为0.4～0.5处取得最小值;水位缓慢下降使边坡安全系数减小的最大幅度可达22%;水位下降越快,等高库水位对应的边坡安全系数越小。进而考察了不同水土软化程度对边坡稳定性的影响,结果表明:库水位对边坡安全系数的影响主要表现为水土软化使边坡土体的粘聚力大幅度减小,从而导致边坡的稳定性大大降低。更多还原

【Abstract】 Based on the assumption of the pore water level is horizontal and no seepage occurred in the slope,the influence of reservoir drawdown on slope stability through limit-state analysis is presented.It is shown that the factor of safety(FOS) of slope changed from violent decrease to rapid increase with water level slow drawdown.The FOS get minimum value when the ratio of water level - height of slope at 0.4～0.5.The FOS of slope could be decreased 22%at the worst condition with soil strength softened by water.And,the FOS became less at rapid drawdown than slow drawdown at the same water level.Further more,the influence of different degree of soil strength softened by water on FOS has been studied.The results show that it is the cohesive strength greatly diminished by water that cause the slope instability principally.更多还原