短桩加固液化砂土时孔压比随桩距变化规律分析

Analysis of the Change of Pore Pressure Ratio with the Pile Spacing in the Liquefiable Sand Soil Strengthened by Short Pile

利用小型振动台模型试验,研究了砂桩加固饱和砂土地基的液化问题,通过分析模型地基内孔压比的变化规律,探讨不同桩距对抗液化效果的影响。试验表明采用砂桩加固可液化砂土,桩长相同时,并不是桩距越密效果越好,抗液化效果与桩体在地基内形成的排水效果密切相关。

Small shaking table tests were carried out to study the liquefaction of the sandy soil strengthened by sand pile. On the basis of analysing the change of pore pressure ratio, the influence of pile spacing on anti-liquefaction effect was discussed. The testing results show that under the conditions of the same length, not always the denser pile produces the better anti-liquefaction effect.