碎石桩挤密施工扰动效应的现场试验研究

碎石桩是一种常用的地基处理方式,其振动挤密施工会对桩周土产生一定程度的扰动效应,但现有关于碎石桩振动扰动效应的研究较少.通过埋设孔隙水压力计、土压力盒、测斜管,并结合静力触探试验,研究了碎石桩施工过程中桩周土中的孔隙水压力、土压力、深层水平位移和强度变化规律.研究结果表明:碎石桩施工时会在桩周土中产生较大的孔隙水压力和深层水平位移,随着孔隙水压力的消散,桩周土中的附加有效应力增加,土体的强度得到一定程度的改善.

The Field Tests of Stone Column Construction Influence

Stone column is commonly used in foundation treatment. Till now,there is little research about theconstruction influence of stone column. The pore water pressure,earth pressure,deep horizontal deformation andstrength during construction process of surrounding soil were respectively measured by piezometers,pressuretransducers,inclinometers and CPT. The field test results show that there were large pore water pressure and deephorizontal deformation due to stone column construction. The effective stress and strength of surrounding soilincreased with the dispassion of pore water pressure.