复合地层盾构施工土体分层沉降原位试验的研究.pdfVIP

第六届 全国土木工程研究生学 术论坛 清华大学 2008 复合地层盾构施工土体分层沉降原位试验研究 1 1.2 1 卫俊杰 ，周松 ，黄醒春 (1．上海交通大学土木工程系 2 ．上海第二市政工程有限公司，上海 200240) 摘 要：本文以北京地铁十号线11 标 （麦子店西路站--亮马河站）地铁区间隧道工程为依托，针对粘土层与砂砾地层的地铁盾 构施工设置深层土体位移监测断面，并随盾构推进过程进行定期监测，取得系统、完整的实测数据。对实测数据加以整理，取部 分具有典型意义的实测结果进行研究，分析不同时段不同深度土体竖向位移的特点及其原因。针对粘土层和砂砾土层的分层土体 竖向位移和地表沉降的关系，利用peck 公式进行理论研究计算，同时利用有限元工具对盾构推进引起的土体位移进行数值模拟， 通过比较分析，研究盾构施工参数、壁后注浆参数、孔隙水压变化等多种因素对地表沉降及深层土体位移的影响。 关键词：盾构施工；原位监测；地表沉降；分层沉降 Formation of layered shield of soil subsidence in situ testing research 1 1,2 1 Wei JunJie ,ZhouSong ,Huang XingChun (1.ShangHai JiaoTong University,ShangHai 200240 2.Shanghai NO.2 Municipal Engineering Co., Ltd.,ShangHai 200065,China) Abstract:In this paper, based on the 11th Subway Tunnel project of Beijing MTR line 10, we set deep soil displacement monitoring section for the formation of clay and gravel soil-layers caused by MTR shield, as the shield move, we promote the process of regular monitioring and get a system, integrity measured data. Then we summarized the measured data for a typical part of the measured results for research, analysis different periods of different soil depth of the possible reasons for vertical displacement. Against clay and gravel layers of stratified soil surface subsidence and vertical displacement of relations, we use peck formula calculated theoretical research, at the same time , we use the finite element method to promote the shield of soil displacement caused by the numerical simulation, and compare the results with the measured data. Theoretical results with the measured data as shown in the deformation of soil obviously do not match, the reaction of the shield construction parameters, t