吹填土地基在真空预压插板期间的沉降计算  

Calculation of vacuum preloading settlement for soft soil foundation during PVDs installation

作　　者：孙立强[1] 闫澍旺[1] 何洪娟[2] 李伟[3] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津城市道路管网配套建设投资有限公司,天津300384 [3]天津港集团有限公司,天津300461

出　　处：《水利学报》2010年第5期588-594,共7页Journal of Hydraulic Engineering

基　　金：天津市科技创新专项资金项目(07fdzdsf02100-03)

摘　　要：吹填土为欠固结土,吹填土地基在真空预压插板过程中会产生固结沉降。本文提出吹填土地基真空预压产生的沉降是由插板期间发生的固结沉降和真空预压期间发生的固结沉降两部分组成。现场监测表明吹填土地基在真空预压插板期的沉降占总沉降的30%～50%,但在目前的设计计算中未能考虑。本文通过分析吹填土地基各土层的受力状态,提出插板期间各土层的沉降量计算方法,计算结果与现场试验结果比较吻合,从而完善了真空预压软基加固沉降计算方法。本文同时深入研究了真空预压各施工时段固结度的计算方法。Large consolidation settlement takes place during strengthening the soft soil foundation with vacuum preloading technique. The total settlement consists of the settlement during PVDs （Plastic Vertical Drains） installation and the sattlement during later vacuum loading. There are several methods for estimating the settlement developed during vacuum preloading. But the displacement during PVDs installation is not suitably considered by the current design method. A procedure to calculate the settlement during PVDs installation is put forward in this paper based on the analysis on the loading characteristics of the soil layers of the improved soil foundation. The calculated results are in good agreement with the field observed data. The degree of consolidation is also discussed in this paper.

关 键 词：真空预压 沉降 固结度 软基加固 吹填土地基 

分 类 号：TV148[水利工程—水力学及河流动力学]