市政管廊基坑施工监测分析研究  

Analysis of Monitoring Results of the Municipal Utility Tunnel Pit

作　　者：王猛[1,2] 余湘娟[1,2] 高磊[1,2] 马杰 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程研究所,南京210098 [3]南京市河西工程项目管理有限公司,南京210000

出　　处：《河南科学》2014年第8期1511-1515,共5页Henan Science

基　　金：中国博士后科学基金资助项目(2012M511193);高等学校博士学科点专项科研基金(20120094120015);江苏省自然科学基金资助(BK20130832)

摘　　要：通过对市政综合管廊基坑开挖的全程监测,结合管廊基坑的特点,分析基坑的水平位移变形、轴力、水位变化和周围地表沉降.研究结果表明以下几点:SMW工法支护下管廊基坑土体变形呈现出"两端小,中间凸"的特点,基坑变形主要出现在开挖过程中;"先撑后挖"会减小土体的变形量;坑外周围土体沉降随基坑开挖先剧烈下降,待基坑开挖到底后,逐渐趋于平缓;基坑在开挖和架设钢支撑时会导致支撑轴力大小浮动,为了确保基坑稳定,水位的监测是基坑监测中必不可少的环节.监测结果可为类似的综合管廊基坑的施工提供参考.Through the whole monitoring process of the excavation of the municipal utility tunnel pit and coupled with the study of the feature of the utility tunnel pit, the horizontal displacement, axial forces of support, changes of water level and the surrounding surface subsidence of the pit are thoroughly analyzed. The results show as follows. Due to the support of SMW, the soil deformation increases first then decreases with depth, the most of the pit deformation appear in the process of excavation. The soil deformation will be reduced when the pit are supported before the excavation. The surrounding surface of the pit subsides sharply in the beginning of the excavation, and it becomes smooth gradually with the process of the excavation. The axial forces of support varies in the process of excavation. In this case, water level monitoring is essential link in foundation pit monitoring to guarantee the stability of foundation pit. In this paper, the monitoring results will provide the reference for the similar construction of the municipal utility tunnel.

关 键 词：综合管廊 基坑 变形 监测 

分 类 号：TU463[建筑科学—结构工程]