成层土地基在强夯作用下的孔压响应  

Pore Pressure Response in Multi-Layered Soil Foundation Improved by Dynamic Compaction Method

作　　者：闫澍旺[1] 魏芸[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《天津大学学报》2010年第3期222-228,共7页Journal of Tianjin University(Science and Technology)

基　　金：交通部西部基金资助项目(200632800003-06);天津市科技创新专项基金资助项目(07FDZDSF02100)

摘　　要：强夯法处理地基应用范围较广,但一般认为对饱和度较高的软黏土地基应谨慎使用.本文依托实际工程,运用有限差分程序FLAC3D,提出了强夯作用在处理成层土地基时存在"软土核"效应,该效应的产生有利于提高强夯法对软土的加固效果.通过研究发现当软土层厚度小于某一临界值,且其相邻土层具有良好的渗透性时才能产生"软土核".研究成果有助于指导在高饱和度黏性土地基中合理运用强夯加固法.The dynamic compaction method can be applied in a wide range of foundation soils, except sort clay Ioun- dations with high saturation. Based on in situ projects, and adopting the finite-difference program FLAC3D, this paper proposes ＂soft soil-core＂ effect, which enhances the strengthening effect of soft soil. The present study reveals that the thickness of soft soil must be under a certain critical value, and its neighboring soils must possess excellent permeability. Research results help to make rational use of the dynamic compaction method in dealing with soft clay foundations with high saturation.

关 键 词：强夯 冲击荷载 超静孔压 饱和软土 “软土核”效应 成层土地基 

分 类 号：TU472[建筑科学—结构工程]