湿陷性黄土地区复合地基沉降量分析研究

基于G6京藏高速公路兰海段湿陷性黄土地区复合地基处理工程,采用FLAC3D数值分析方法计算复合地基在车辆荷载与复合地基自重作用下的沉降量,结合实际工程的沉降观测数据,验证数值分析结果。分析结果表明:复合地基最终监测的沉降量大致在15mm左右,与数值分析结果基本一致;随着桩体深入稳定土层深度逐渐增加,桩在达到应力平衡状态时的最终沉降量也明显降低;整个沉降过程可以分为两个时间段,在前1/3时段为沉降幅度最大的时间段,在后2/3时段,沉降幅度急剧下降。

Settlement analysis of composite foundation in collapsible loess area

Based on the composite foundation treatment project of the collapsible loess area in G6 Beijing-Tibet Expressway Lanzhou-Haishiwan Section, using FLAC3D numerical analysis method to calculate the settlement of composite foundation under the action of vehicle load and composite foundation weighting, the numerical analysis results are verified by combining the settlement observation data of the actual project. The results show that the settlement of final monitoring of the composite foundation is approximately 15mm, which is basically consistent with the numerical analysis results. As the pile depth inserts into the soil gradually increases, the final settlement of the pile is also significantly reduced when the stress balance is reached. The whole settlement process can be divided into two time periods. In the first 1/3 period, the settlement period is the largest, and in the second 2/3 period, the settlement amplitude drops sharply.