2016年1月上施工技术 第45卷第1期CONSTRUCTIONTECHNOLOGY103 DOI:10.7672/sgjs2016010103 城市隧道小间距相邻深基坑施工监测分析
梁师俊'，朱海东'，赵波² （1.浙江建设职业技术学院，杭州浙江311231；2.上海华铁工程咨询有限公司，上海200071） [摘要］结合某小间距相邻基坑开挖施工监测数据，分析了杭州深厚软土层紧邻基坑施工过程相邻位置地表沉降、 立柱沉降、坑外水位、支撑轴力和深层土体水平位移的影响，结果表明：先行施工基坑受后继施工基坑的影响较小， 后继施工基坑受先行施工基坑影响大，两基坑相邻侧土体的竖向位移与水平位移都较非相邻侧土体小，后继基坑 开挖使得先行开挖基坑支撑轴力明显减小；先行施工基坑深层土体最大水平位移在最终开挖面附近，后继开挖基 坑深层土体最大水平位移下移最终开挖面以下。
[关键词】隧道工程；基坑；小间距；监测；施工技术 [中图分类号】TU753[文献标识码]A[文章编号】1002-8498(2016)01-0103-06
FoundationExcavationof TunnelsinCity Liang Shijun', Zhu Haidong', Zhao Bo² （1.Zhejang College ofConstruction，Hangzhou,Zhejang 311231,China; 2.Shanghai Huatie Engineering Consuling Co.，Ltd.，Shanghai200071,China) Abstract;Based on the field data of two small spacing adjacent deep foundation excavation, the mutual impact of excavation of small spacingadjacent deepfoundation excavation，such as surface subsidence， settlementfpillars，groundwaterlevels，theaxialforcesofstrutsandsoileephorizontaldisplacement were analyzed.The results show that the former foundation excavation has less influence by the subsequent excavation，while the subsequent foundation excavation has great influence by the former excavation.Bothofverticaldisplacements andhorizontaldisplacements of the soil intheadjacentcentral position of foundation excavation are less than those in the sides.The axial forces of struts of the former foundation excavation will be significantly reduced as the subsequent excavating.Themaximum values of deep horizontal displacement of the former foundation excavation near the finally excavation surface， and those of the subsequent foundation excavation sits beneath the finally excavation surface. Key words:tunnels; foundation excavation; small spacing; monitoring; construction 0引言据分析了基坑开挖对围护结构、周围环境的影响；
设往往涉及基坑工程。
基坑开挖会使围护结构产析了基坑开挖性状。
以上研究对于深人理解基坑 生水平与竖向变形，导致周围环境亦随着变化。
为开挖变形性状具有积极的作用。
但近年来，基坑工 预测基坑开挖变形及对周围环境的影响，选取合理程越来越复杂”，特别是城市隧道、城市地铁的大 的开挖方式与支护结构，国外通过分析大量基坑工规模建设，两个或多个小间距相邻基坑同时或交替 程实测数据，研究了基坑围护结构变形、坑外地表施工的情况越来越普遍，这使得基坑周围环...
