摘要
基于有限差分理论,通过对FLAC3D软件自带蠕变CVISC模型进行适当修正后得到组合粘弹塑性KV-M-C模型,采用该模型对SMW工法围护软粘土基坑不同开挖工况下坑底回弹、基坑周围地表沉降、钢支撑内力及围护墙的变形情况等进行了蠕变数值计算,结果表明:随着基坑开挖深度的增大,坑底位移及基坑周边地表沉降将越大,围护墙体最大侧向位移在第二道支撑与基坑底部之间;将蠕变计算结果与弹塑性计算结果进行对比分析表明,基坑底鼓及周边地表沉降的位移分布规律基本相似,但考虑土体蠕变特性后基坑底鼓、地表沉降及钢支撑轴力的数值都明显偏大。
Based on finite difference theory, the foundation pit resilience, ground settlement around foundation pit,inner force of steel supports and lateral displacement of SMW retaining wall are calculated by using FLAC3D in different work conditions with the creep model-KV -M -C model, expanded from the CVISC model. The calculation result shows that： with the depth of foundation pit increasing, the foundation pit resilience and ground settlement will grow, the maximum lateral displacement of the SMW retaining wall is distributed in the place between bottom of the foundation pit and the second steel supporting; compared with calculation results of e - v - p and e - p, the result shows that, both foundation pit resilience and ground settlement have the same distribution law by calculating with KV - M -C model and M -C model, but the value of foundation pit resilience, ground settlement and inner force of steel supports are much more, in condition with considering the soft caly creep effect.
出处
《地下空间与工程学报》
CSCD
北大核心
2009年第4期797-802,共6页
Chinese Journal of Underground Space and Engineering
基金
教育部"新世纪优秀人才支持计划"(编号NCET-05-0763)
江西省教育厅科技计划项目(GJJ09220)
关键词
SMW工法
深基坑
有限差分
蠕变
Soil mixing wall working method
deep foundation pit
finite difference
creep
