真空预压法加固软土地基的影响区分析

本文根据钻孔试验结果，分析了真空预压法加固软土地基时对周围土体土性指标的影响，利用不同地质条件下真空预压加固区外变形观测资料，分析了加固区一定范围内土体水平位移、地表沉降大小及影响因素，提出利用理论计算最大沉降量S∞估算加固影响区可能发生变形的经验方法，在加固区外有构筑物，在加固区外有构筑物时，预压边线与构筑物间预留一定的安全距离或应采取防止过大变形措施。

Analysis of Affected Surrounding Area of Soft Soils Improv ed with Vacuum Preloading Technique

Based on the results of borehole testing,the effect of vacuum preloading technique when being employed to improve soft soils upon the property index of the surrounding soils is analyzed herein. The observed data of deformation of soils outside the improved areas by vacuum preloading in dif ferent geological conditions are employed to analyze the horizontal deformation of soil mass within a certain range of soils and surface settlement in the improv ed areas as well as fectors which may have an influence upon the deformation and settlement. An empirical method is presented herein to estimate the possible d e formation in the affected areas of soils to be improved by using the theoretically calculated maximum settlement S∞. When there are structures and buildings outside the improved areas, there should be a safe buffer zone between the borde r of the improved areas and the structures and buildings in question or precauti ons should be taken to prevent over-deformation.