强夯块石墩法处理软弱土地基的试验  

Field test on treatment of soft ground using stone block by dynamic compaction

作　　者：李华伟[1] 白冰[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《北京交通大学学报》2013年第1期67-72,共6页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金资助项目(51279002)

摘　　要：根据现场测试结果,对强夯块石墩法处理软弱土地基的施工参数和效果进行了分析,对强夯置换法施工过程中孔隙水压力的发展和消散过程及施工影响范围进行了研究,并通过现场试验给出经过强夯块石墩处理后地基承载力变化.研究表明,对于所处理的软弱土地基,当采用块石(或碎石)填料后,地层中的排水性能得到显著改善,使强夯动力荷载作用下的孔隙水压力消散很快.此外,强夯块石墩处理地基所引起的孔隙水压力,在水平方向一般局限在距离强夯置换点小于4m的水平距离范围内,而其深度方向的影响则比较大,即比之常用的强夯法有较大的加固深度.Combining with a typical field test on the treatment of soft soil ground using stone block by dynamic compaction,this paper analyzes the treatment techniques and its mechanism such as the processes of dynamic compaction and packing method,etc.This paper discusses the development and dissipation of pore pressure induced by dynamic loading and the affecting ranges in horizontal and vertical direction.Besides,the variation of bearing capacity of the soft ground is investigated.The study shows that,the drainage conditions of the soft soil layers can be improved greatly by using block stone（or crushed stone） columns,and the pore pressure induced by dynamic compaction are localized within a range of 4 m in radial direction,while the effect of pore pressure is greater in depth.

关 键 词：块石墩法 软弱土 孔隙水压力 承载力 

分 类 号：TU473[建筑科学—结构工程]