真空联合堆载预压法加固软土地基现场试验研究  

In-situ Test Study on Reinforcement of Soft Soil Foundation by Vacuum&Surcharge Preloading

作　　者：张青波 崔维孝 周斌 唐伟 ZHANG Qingbo;CUI Weixiao;ZHOU Bin;TANG Wei(China Railway Design Corporation,Tianjin 300308,China;The First Engineering Co.,Ltd.of CTCE Group,Hefei 230041,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308 [2]中国中铁四局集团第一工程有限公司,合肥230041

出　　处：《路基工程》2020年第4期47-52,共6页Subgrade Engineering

基　　金：科技部对发展中国家科技援助项目(KY201502006)。

摘　　要：为了优化万隆湖积软土地基处理方案,开展了现场试验研究,通过监测数据分析了真空联合堆载预压法的加固效果和环境影响。结果表明:通过真空联合堆载预压可以达到控制工后沉降和提高地基土强度的目的;沉降影响范围在20.0 m左右,预压区边缘6.0 m深范围的土体产生显著的水平位移;排水板间距由1.0 m加密为0.8 m后,沉降速率增快2.7%~12.5%;建议排水板深度穿透淤泥层,工期许可时应采用较大的排水板间距。In order to optimize the treatment plan for Bandung lacustrine soft soil foundation,in-situ tests were carried out to analyze the reinforcement effect and environmental effect of vacuum&surcharge preloading by use of the monitoring data.The result shows that vacuum&surcharge preloading may control post-construction settlement and improve the strength of foundation soil;the scope of settlement effect is about 20.0 m,and there arises remarkable horizontal displacement at the soil mass 6.0 m in depth at the edge of preloading zone;when the drain board spacing is closed from 1.0 m to 0.8 m,the settlement rate is faster by 2.7%~12.5%.It is suggested that the drain board is deeply penetrated through silt layer with the large spacing to be used when the construction period permits.

关 键 词：真空联合堆载预压 万隆湖积软土 地基处理 环境影响 沉降速率 

分 类 号：TU472.3[建筑科学—结构工程]