桩墙框架结构围堰稳定性分析

桩墙框架结构(PWFS)是一种双壁板桩框架结构,由钢筋混凝土整体预制框架连接成双排密集管桩。在叶尔羌河巴楚县水利围堰工程中,对桩身侧向位移进行了详细监测。建立了试验的三维有限元模型,研究了PWFS的稳定破坏机理。模拟计算结果表明,有限元计算得到的桩侧移与实测值吻合较好,控制滑移面位于抗剪强度指标较差的土层底部。通过工程试验验证了PWFS的可行性,所建立的简化设计方法对结构稳定性预测是合理有效的。

Stability Analysis of Cofferdam in Piling Wall Frame Structure

The piling wall frame structure(PWFS)is a double-wallboard pile frame structure,which is connected by a reinforced concrete integrated precast frame to form double rows of dense pipe piles.The lateral displacement of the pile is monitored in details in the hydraulic cofferdam project of Bachu County on Yerqiang River.A three-dimensional finite element model is established to study the stability failure mechanism of PWFS.The simulation results show that the pile lateral displacement calculated by the finite element method is in good agreement with the measured value,and the control sliding surface is located at the bottom of the soil layer with poor shear strength index.The feasibility of PWFS has been verified by engineering experiments,and the simplified design method is reasonable and effective for the prediction of structure stability.