碎石桩处理可液化地基加密效用的理论分析

Theoretical Analysis on Compaction Effectiveness of Liquefiable Foundation by Pebble Columns

以弹塑性理论为基础,将沉管碎石桩的成桩过程视为半无限土体中的圆孔扩张问题,推导了碎石桩处理可液化地基的有效影响范围。考虑超孔隙水压力消散的影响,结合超孔隙水压力计算公式,对碎石桩的加密效用进行了理论分析,并给出了碎石桩加密效用的理论计算公式。最后,结合工程实例,验证了所给公式的正确性。碎石桩处理可液化地基加密效用的理论,为工程设计中碎石桩间距离的确定,提供了理论依据;该理论计算的结果,对碎石桩复合地基加固效果的判断、碎石桩地基处理应用范围的确定等有重要参考价值。

Based on elastic-plastic theory and the theory of cavity expansion, the extent of soil-layer effective impact by the dry-vibrated pebble columns is analyzed. By taking into account the dissipation and estimation formula of super porous water pressure, compaction effectiveness of pebble columns is analyzed. The theoretical estimation formula is presented. Finally, the accuracy of theoretical estimation formula is exemplified by practical case of engineering project. Theoretical analysis of compaction effectiveness of anti-liquefaction by stone columns provides fundamental basis for determining the space of columns in engineering design. The counting result has some reference value for judging reinforcement effect and determining reinforcement domain of stone column composite foundation.