强夯加固粉土地基孔压及变形特性研究  

Pore Pressure and Deformation Characteristic of Silt Foundation under Dynamic Compaction

作　　者：厉超[1,2] 张宏博[1,2] 陈晓光[1] 李进[1] 

机构地区：[1]山东大学土建与水利学院,济南市250061 [2]山东省路基安全工程技术研究中心,济南市250061

出　　处：《公路》2015年第10期40-46,共7页Highway

基　　金：国家自然科学基金;项目编号51208284;山东省科技发展计划;项目编号2013GSF11603

摘　　要：通过分析强夯孔压和变形的现场试验数据及数值模拟结果,对强夯加固粉土地基孔压及变形特性进行了研究,得出如下结论:(1)超孔压随夯击次数增加而增大,其累积曲线的斜率随着夯击次数增加逐渐趋近于零,浅层土超孔压累积值远大于深层土;(2)地面沉降量在第一击时最大,而后随着夯击数的增加而减小,并逐渐趋于一定值,到止夯时,不同夯击能地面沉降变形累计值近似相等;(3)强夯土体扰动大致分为强扰动区(-4~0m)、弱扰动区(-8^-4m)和微扰动区(-8m及以下),其中强扰动区和弱扰动区作为主扰动区,是主要加固区域;(4)超孔压的产生和消散远滞后于沉降变形,表明了超孔压的滞后性。Pore pressure and deformation characteristics of silt foundation are studied be means of analyzing field test data and numerical simulation results under dynamic compaction,and conclusions are drawn as follows：1）excess pore pressure increases with the increase of tamping times, whose accumulation curve slope gradually approaching zero with the increase of tamping times,and the excess pore pressure accumulation value in shallow soil is larger than that in deep soil;2）ground settlement under the first tamp is the largest,then decreases and approaches a certain value with the increase of tamping times and the accumulation values are equal when tamping stops;3）soil disturbance areas under dynamic compaction can be roughly divided into strong disturbance area（-4～0m）,weak disturbance area（-8～-4m）and micro disturbance area（-8m and below）,among those the strong and the weak disturbance areas are the main disturbance areas and the main reinforcement areas;and 4）the generation and dissipation of excess pore pressure far lags behind the settlement deformation,which shows the hysteresis of excess pore pressure.

关 键 词：强夯 粉土地基 孔压 变形 

分 类 号：U416.1[交通运输工程—道路与铁道工程]