并行矩形顶管施工引起地层变形影响研究  

Ground Deformation Induced by the Parallel Rectangular Tube Jacking

作　　者：陈雪华 周丽红 吴起星[2] 叶忠帅 柳国栋 敖翔 王兴兴 CHEN Xuehua;ZHOU Lihong;WU Qixing;YE Zhongshuai;LIU Guodong;AO Xiang;WANG Xingxing(Guangzhou Golden Soil Geotechnical Engineering Technology Co.Ltd.,Guangzhou 510000;Jinan University,Guangzhou 510000;Guangdong Changzheng Construction Co.,Ltd.,Zhuhai 51900)

机构地区：[1]广州金土岩土工程技术有限公司,广州510000 [2]暨南大学,广州510000 [3]广东长正建设有限公司,广东珠海519000

出　　处：《土工基础》2022年第4期551-558,共8页Soil Engineering and Foundation

摘　　要：以珠海兴业快线工程为背景,采用现场监测数据分析和数值仿真相结合的方法研究并行矩形顶管施工地层变形规律,结论如下:(1)始发井端头土体加固和顶管始发顶进时机头微欠挖能有效控制地表变形,确保矩形顶管始发安全;(2)在正常顶进时,地表横向沉降形状与Peck曲线吻合,沉降槽宽度为2~3倍管节宽度;(3)单线顶管引起地表横向沉降呈V型,双线顶管引起地表横向沉降呈W型,地表沉降槽宽度为3倍管节宽度,先行管比后行管施工引起地表沉降大约2 mm;(4)数值模拟双线顶管分别顶进至65 m和60 m时,先行管施工引起的地表沉降最大值为13 mm,后行管引起地表沉降最大值为10 mm,且在机头前方5 m范围内地表均呈现沉降变形。This paper presents a case history of twin parallel rectangular tubes jacking in Xingye Express Line Project. The ground deformation induced by the tube jacking was monitored and the monitored data were compared with the numerical analysis results. The conclusions are as follows:(1) the ground deformation can be effectively controlled by the soil improvement at the end of the launching pit and the micro undercutting of the machine head during the starting and jacking of pipe jacking to ensure the safety of the rectangular tube jacking;(2) During the normal jacking, the shape of the surface cross sectional settlement is consistent with the Peck curve, and the width of settlement trough is 2-3 times of the tube width;(3) The surface horizontal settlement caused by the single line tube jacking is V-shaped, and the surface horizontal settlement caused by the double line tube jacking is W-shaped. The width of the surface settlement groove is 3 times the width of the tube. The surface settlement caused by the construction of the front tube is about 2mm than that of rare pipe tube;(4) The numerical simulation shows that when the twin tubes were jacked to 65m and 60m respectively, the maximum surface settlement caused by the front pipe jacking is 13mm, and the maximum surface settlement caused by the rare tube is 10mm, and the surface within 5m in front of the machine head shows settlement deformation.

关 键 词：并行矩形顶管 地层变形 监测数据分析 数值仿真 

分 类 号：TU433[建筑科学—岩土工程]