Influence study of rainfall and reservoir level fluctuations on stability of Xiangyang Reservoir bank slope
Under the action of water,the seepage field of groundwater and the mechanical properties of rock and soil on the bank slope undergo changes,thereby affecting the overall stability of the bank slope.Taking the bank slope project of Pingjin Village,Xiangyang Reservoir in Chongqing City as an example,based on the unsaturated fluid structure coupling theory,elastic-plastic theory,and strength reduction method,and used finite difference method to analyze the sliding fail-ure mode and safety factor change law of Pingjin Village Grade Ⅱ gentle slope under various working conditions such as rainfall and reservoir water level changes.The efficacy of the surcharge measures applied at the toe of the bank slope for e-rosion protection was assessed.The results indicated that:①There were three potential slip modes on the bank slope under different working conditions,namely slip along the slope surface cover layer,slip along shallow weak interlayers,and slip a-long deep fractured interlayers.② The natural groundwater level on the bank slope was relatively low,when encountering extreme rainfall,a large amount of rainwater infiltration would rise the groundwater level,the effective stress of the slope would be reduced,the shear resistance would be weakened,and the stability of the slope would be significantly reduced.③ The adoption of leading edge foot pressure protection measures could effectively improve the overall stability of the bank slope,and the safety factor of multiple sliding modes after the foot pressure was increased by about 0.01 to 0.30.
reservoir bank slopecreep deformationrainfall infiltrationstrength reduction methodXiangyang Reser-voir
万方数据
维普
