软土地区基坑群施工对邻近浅埋地下管线影响  

Influence of Construction of Deep Excavation Groups on Adjacent Shallowly Buried Pipelines in Soft Clay

作　　者：黄沛[1] 杨潇 李翔宇 刘钦[1] 王蕾 HUANG Pei;YANG Xiao;LI Xiang-yu;LIU Qin;WANG Lei(School of Civil Engineering,Chang'an University,Xi'an 710061,Shaanxi,China;Wuhan Metro Group Co.Ltd.,Wuhan 430o70,Hubei,China;Institute of Foundation Engineering,China Academy of Building Research,Beijing 100013,China;Agricultural Bank of China Shaanxi Free Trade Zone Xi'an Hi-tech Branch,Xi'an 710065,Shaanxi,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]武汉地铁集团有限公司,湖北武汉430070 [3]中国建筑科学研究院有限公司地基基础研究所,北京100013 [4]中国农业银行陕西自贸区西安高新分行,陕西西安710065

出　　处：《中国公路学报》2023年第3期146-155,共10页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51608042);中央高校基本科研业务费专项资金项目(300102281203,300102281206)。

摘　　要：为掌握软土地区大型基坑群施工对邻近浅埋地下管线沉降的影响,通过现场实测数据分析,研究了地下连续墙施工和基坑分区开挖对邻近管线的影响。研究结果表明:与单体基坑相比,基坑群施工过程中,管线的沉降具有显著的叠加效应,管线沉降受到多个基坑开挖的影响;管线的总沉降与基坑群等效开挖深度(He)的比值介于0.11%~0.55%;地下连续墙施工期间,管线沉降占总沉降比值最大可达50%,主要影响区域为0.3Hw(地下连续墙深度),次要影响区域为0.3Hw~1.5Hw,主要影响区管线沉降为0.02%Hw~0.09%Hw;基坑开挖期间,主要影响区域为1.0He,次要影响区域为1.0He~4.5He,主要影响区管线沉降介于0.18%He~0.39%He;浅埋地下管线沉降随着管线与基坑间距的增大而减小,管线沉降主要受管线与基坑间距大小的影响,管线相对刚度和埋深对管线沉降无决定性影响。In order to understand the impact of construction of large deep excavation groups on adjacent shallowly buried underground pipelines in soft clay,the influences of diaphragm wall construction and zoned excavation on pipelines settlements were analyzed by the field instrumentation data.The results show that during the construction of the deep excavation group,the underground pipelines settlements exhibited significant additive effects.Pipelines are affected by the excavation of multiple adjacent foundation pits.The ratio of the total settlement of underground pipelines to the equivalent excavation depth(He)ranged from 0.11%to 0.55%.The maximum ratio of pipeline settlement caused by diaphragm walling to total settlement can reach 50%.The main affected area during the diaphragm wall construction was 0.3Hw(diaphragm wall depth),and the subordinate affected area was 0.3Hw-1.5Hw.Settlements of the main affected area during diaphragm walling ranged from 0.02%Hwto 0.09%Hw.The main affected area of the foundation pit groups excavation was 1.0He,and the subordinate affected area was 1.0He-4.5He,where He is the equivalent excavation depth of the foundation pit groups.Settlements of the underground pipeline in the main affected area during the excavation groups construction ranged from 0.18%Heto 0.39%He.The settlements of shallowly buried underground pipelines decreased as the distance between pipelines and deep excavation increased.The settlements of shallowly buried pipelines caused by adjacent excavation groups were predominantly governed by the distances between pipelines and deep excavation and less influenced by pipeline relative stiffness and buried depth.

关 键 词：道路工程 基坑 现场监测 管线 分区开挖 软土 

分 类 号：U417.9[交通运输工程—道路与铁道工程]