Stability and Seismic Response of Earth-rockfill Dam in Coastal Soft Clay Roadbed
Based on a soft clay earth-rockfill dam project in the southeast coastal areas,and the theo-ries of the simplified Bishop method,the two-dimensional steady seepage control equation,and the dynamic response equation of motion theory,the finite element method was adopted to investigate the stability of earth-rockfill dam in deep saturated soft clay under fast loading,steady seepage and seis-mic response under different Taft peak accelerations.The results show that the probability of overall instability occurring on the downstream surface of earth rock dams is higher than that on the upstream surface,while the probability of local instability occurring on the downstream surface is lower than that on the upstream surface.During the steady-state seepage stage,the sudden change point of the streamline mainly occurs near the contact surface between the left side of the earth rock dam and the foundation.Under seismic loads,as the peak acceleration increases,the safety factor of the critical sliding surface of the earth rock dam tends to decrease,and its mode gradually changes from linear to parabolic with the increase of earthquake duration.The research results have reference value for the optimization design and stability evaluation of similar engineering earth-rockfill dams.
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