湿喷桩强度的含水率及土层影响分析

Analysis of Influence of Soil Strata and Water Content Ratio on the Strength of Wet Jetting Pile

为研究土层及含水率变化对湿喷桩强度的影响,以连盐高速盐城段湿喷桩复合地基为研究背景,通过室内模型试验和理论分析,主要分析了土层和含水率的变化对湿喷桩成桩质量的影响。选取2种代表性的土进行了室内模拟试验,通过对湿喷桩单轴抗压强度的对比分析,得到以下结论:粘土层中湿喷桩强度高于粉土层中湿喷桩的强度,主要原因是粘土层中水泥浆液与土体颗粒和水体发生了更强的离子交换和团粒化作用及硬凝反应;土的含水率对湿喷桩强度有显著影响,且存在一最优含水率,在该含水率下,湿喷桩强度显著提高。研究结果可为分析湿喷桩在不同含水率和土层下的强度特性提供依据。

In order to study the influence of variation of soil strata and water content ratio on the strength of wet jetting pile, model test is conducted with two representative type of soil.Uniaxial compression strength of wet jetting pile with different soil stratas and water content ratios are analyzed. It is concluded that, 1） Strength of wet jetting pile in clay strata is larger than that in silty soil strata, which caused by the fact that cement serosity soil particle and water in clay stratum have stronger ion exchange aggregate and pozzolanic reaction;2） Water content ratio of foundation have prominent influence on strength of wet jetting pile, and there exist a optimum water content for maximum wet letting pile strength.