卸荷式板桩码头地震液化灾害三维数值模拟

3D Numerical Simulation of Seismic Liquefaction Disaster to Unloading Type Sheet Pile Wharf

为研究卸荷式板桩码头的抗震和抗液化性能,以多孔饱和介质理论为基础,对有限元-有限差分耦合的方法进行程序化,开发可模拟砂土液化性能和土结构相互作用的数值程序,并对三维卸荷式板桩码头结构进行地震液化灾害分析。研究表明:地基砂土液化对板桩、遮帘桩和卸荷平台会造成较大的水平变形,板桩和遮帘桩上的土压力和弯矩随地震强度的增大而增大;对于所设计的新型板桩码头结构,在"板桩-遮帘桩-卸荷平台-锚桩-拉杆"共同作用下,整体结构仍是安全可靠的。

To analyze the anti-seismic and anti-liquefaction of sheet pile wharf, the finite element and finite difference coupled method is applied and programmed based on porous media theory to develop the numerical simulation program of liquefied soil and the interaction between the structure and soil. Through the seismic liquefaction disaster analysis of 3D unloading type sheet pile wharf structure, it is found that the liquefied soil can induce a large horizontal deformation to the sheet pile and the barrier pile, the earth pressure and moment on the sheet pile increase as the increase of the earthquake magnitude; for the designed new type sheet pile wharf, the structure is stable under the combined action among sheet pile, covered pile, unloading platform, anchor pile and steel pole.