刚性基础软土地基的真空预压处理

Vacuum preloading applied to soft soil of rigid foundation

以南方某污水处理厂现场监测资料为依据,分别采用双曲线法、指数曲线法、Asaoka法推算地基的最终沉降量、分析真空预压的加固效果。通过Terzaghi固结理论反算地基水平平均固结系数,计算值较室内试验值更符合实际,弥补了室内试验的不足。虽然真空预压法在刚性基础软土地基中的加固效果较好,拓宽了其应用领域,但是仍然存在着一定的工后残余沉降量,应在结构设计中预以考虑。

In this paper, we discuss this issue of vacuum preloading used in rigid foundation, by computing the final settlement and analyzing consolidation result. The monitored data from a sewage farm in southern China were processed by three respective methods： hyperbolic matching, exponential matching and Asaoka method. In addition, the mean horizontal consolidation coefficient is back-analyzed by using Terzaghi consolidation theory. The back-analysis of this project is closer to the settlement fact than indoor soil mechanical test. Even though the vacuum preloading sometimes is suitably applied to soft soil of rigid foundation, it has a little residual settlement. All of these should be taken into account in structure design.