群桩加固液化地基的数值模拟研究

Numerical Simulation of Pile Group Reinforcement for Liquefaction Foundation

采用有限差分软件FLAC3D对刚性排水桩和碎石桩群桩加固液化地基建立模型,分析了不同桩径、桩间距和地震作用对群桩抗液化效果的影响。研究表明:桩径的变化对两种群桩加固后的抗液化能力影响不大;刚性排水桩抗液化有效范围为2倍桩径,碎石桩抗液化有效范围为3倍桩径;在多遇地震和设防地震作用下碎石桩的抗液化效果比刚性排水桩效果好,在罕遇地震作用下两者抗液化效果相当。

Finite difference software FLAC3D was used to build a model for strengthening the liquefaction foundation of rigid drainage pile and gravel pile group,and the influence of different pile diameter,pile spacing and seismic action on the anti-liquefaction effect of pile group was analyzed.The results show that the change of pile diameter has little effect on the anti-liquefaction of the two populations.The effective range of anti-liquefaction of rigid drainage pile is 2 times of pile diameter and that of grawel pile is 3 times of pile diameter.The anti-liquefaction effect of gravel pile is better than that of rigid drainage pile under the action of frequent earthquake and earthquake fortification,and both anti-liquefaction effects are equal under the action of severe earthquake.