摘要
通过室内固结试验来模拟超载预压下卸载再加载时路基的受荷过程,测定不同受荷阶段土体压缩性参数随压力的变化。试验结果表明,压缩系数在各受荷阶段随压力增大而减小并趋于平稳,加载阶段其变化率最大;土体模量在加载和再加载阶段随压力呈线性增加趋势,在卸载阶段呈二次增加趋势,回弹模量最大,且增加速率很快;固结系数在加载阶段先增加后减小,在卸载和再加载阶段则是随着压力增加而增加并趋于平稳,卸载阶段固结系数最大。成果可为考虑卸载再加载时沉降计算参数的选取提供依据和借鉴。
The indoor consolidation test is carried out through simulating loading process of the roadbed under unloading-reloading of surcharge preloading,and measure the changes of compressibility parameters with pressure in different stages of loading.It is found that coefficient of compressibility reduce gradually with the increase of pressure in every stage and at last it will be stable,and in loading stage the compressibility reduce very soon.The soil modulus in loading and reloading stages present a linear trend of increase when in unloading stage it has quadratic form trend with the pressure,and resilience modulus is the biggest while it increases quickly.In loading stage,the coefficient of consolidation increases first and then reduces,and it increases with the pressure and finally will be stable in unloading and reloading stages.Also,the coefficient of consolidation is the biggest in unloading stage.The results can provide the basis and reference for selecting parameters in calculation settlement when unloading-reloading is considered.
出处
《科学技术与工程》
北大核心
2013年第3期790-794,共5页
Science Technology and Engineering
基金
河海大学中央高校基本科研业务费专项资金(2012B02314)
中国博士后科学基金(2012M511193)
江苏省博士后科研计划项目(1102073C)资助
关键词
超载预压
卸载再加载
压缩系数
土体模量
固结系数
surcharge preloading unloading-reloading coefficient of compressibility soil modulus coefficient of consolidation
