软土地区相邻深基坑有限土体影响分析研究  

Influence of Narrow Width Soils Between Deep Excavations in Soft Soils

作　　者：吴可铮 WU Kezheng(Shanghai Urban Construction Design&Research institute(Group)Co.Ltd.,Shanghai 200125)

机构地区：[1]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《土工基础》2023年第3期473-476,共4页Soil Engineering and Foundation

摘　　要：随着城市地下空间持续开发,相邻深基坑工程施工越来越常见。由于相邻基坑间有限宽度土的影响,基坑两侧土压力呈现非对称状态,基坑支护内力、变形及周边环境影响很难通过传统设计理论进行计算分析。结合上海某具体工程实例,基于HS-Small模型采用数值分析办法,分析了周边基坑对本项目深基坑支护内力、变形及周边环境的影响,并与实测数据进行比较。结果表明:传统对称基坑设计方法往往会低估远离相邻基坑侧的支护变形和内力,而靠近相邻基坑侧则偏于保守。相邻基坑支护刚度越小,基坑侧移越大,基坑间有限宽度土压力越大,研究为今后相邻深基坑工程设计提供一定的参考。With the development of underground space engineering,the phenomenon of adjacent deep foundation pits is becoming more and more common.Due to the influence of narrow width soil between adjacent deep excavations,the lateral earth pressures on both sides of foundation excavation are asymmetric and it's difficult to analyze the internal forces and deflections of the excavation support and the effect on the environment based on the classical excavation design theories.The design and practice of an adjacent deep excavations in Shanghai are presented.The numerical analysis method is used to analyze the internal forces and deflections of the excavation support and the effect on the environment based on HS-Small Strain model.The analytical results are compared with the measured data.The results show that the deflections and internal force of supporting structure on the side away from the adjacent excavation will be underestimated and the design on the side near the adjacent excavation is conservative through the traditional symmetrical excavation design method.Besides the deflections of the adjacent excavation and the lateral earth pressure between the excavation become larger while the stiffness of the adjacent excavation becomes smaller.

关 键 词：相邻深基坑 有限宽度土体 数值分析 非对称基坑开挖 

分 类 号：TU473[建筑科学—结构工程]