格形钢板桩结构填料土压力及剪切破坏面研究

Research on Fill Soil Pressure and Shear Failure Surface of Cellular Steel Sheet Pile Structure

基于FLAC2D对格形钢板桩结构进行了受力和变形分析,将不同水平荷载下得出的计算土压力,与静止土压力、Rankine主动土压力、Rankine被动土压力进行了对比,提出了格内填料土压力的简化计算方法.认为:格体前桩的土压力分布可以采用Rankine主动土压力;后桩的土压力则以钢板桩水平位移为零的点分为上下两部分,上部分为均布土压力,下部分线性增大至静止土压力.格内填料的剪切应变增量发展过程表明:格型钢板桩的剪切破坏面主要发生在格体的中轴处,符合太沙基法给出的结论.

Stress and deformation analysis of the cellular steel sheet pile structure was carried out with FLAC2D.By comparing the computational soil pressure with the static soil pressure,the Rankine active soil pressure and Rankine passive soil pressure,the simplified calculation method of the fill soil pressure was given,it considers that front pile of the structure is subjected to Rankine active soil pressure,and soil pressure on back pile is divided into two parts by the point of zero displacement,pressure of constant value acting on the upper part,while pressure on the lower part increasing linearly to the static soil pressure.On the other hand,the development of shear strain increment shows that failure surface often occurs in the medial axis of the cellular cell,which is consistent with the conclusion of Terzaghi.