大直径盾构隧道下穿城市既有道路沉降分析及预测  

Settlement Analysis and Prediction of Large Diameter Shield Tunnel Underpassing Existing Urban Road

作　　者：王义强 岳迎新 葛忻声[2] WANG Yiqiang;YUE Yingxin;GE Xinsheng(Traffic Engineering Branch of China Railway Sixth Group Limited Company,Beijing 100036,China;School of Civil Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]中铁六局集团有限公司,北京100036 [2]太原理工大学土木工程学院,山西太原030024

出　　处：《建筑施工》2020年第11期2180-2184,共5页Building Construction

摘　　要：以太原西南环线晋西隧道下穿某城市道路为背景,对大直径盾构隧道下穿城市既有道路时的沉降进行分析与预测。依据实际施工方案建立FLAC3D仿真模型,分析既有城市道路的弹性模量与路基厚度对路面沉降的影响。结果表明:城市道路的存在能够更好地约束拱顶上方土体变形,使得路面各点沉降速率差较小,呈现出整体下沉的趋势,沉降曲线整体上移;路面弹性模量和路基厚度的增大均能使路面最大沉降变小,同时路面弹性模量的增大还可减小路面各点沉降差;当路面弹性模量为40 MPa时,最大沉降为-3.6 mm,各点沉降差为0.4 mm。结果证明在太原地区运用Peck公式预测路面沉降是准确可行的,公式中关键参数沉降槽宽度参数介于0.20~0.52之间,地层损失率介于0.10~0.24之间。Based on the background that Jinxi tunnel of Taiyuan southwest ring line passes through an urban road,the settlement of large diameter shield tunnel passing through existing urban road is analyzed and predicted.According to the actual construction scheme,the FLAC3D simulation model is established to analyze the influence of the elastic modulus and subgrade thickness of the existing urban road on the pavement settlement.The results show that the existence of urban road can better restrain the deformation of soil above the arch crown,making the settlement rate difference of each point of the road surface smaller,showing a trend of overall settlement,and the settlement curve moves up as a whole;the increase of pavement elastic modulus and subgrade thickness can reduce the maximum settlement of pavement,and the increase of pavement elastic modulus can also reduce the settlement difference of each point of the pavement when the modulus is 40 MPa,the maximum settlement is-3.6 mm,and the settlement difference of each point is 0.4 mm.The results show that it is accurate and feasible to use peck formula to predict pavement settlement in Taiyuan area.The key parameters in the formula are the width of settlement trough between 0.20 and 0.52,and the formation loss rate is between 0.10 and 0.24.

关 键 词：盾构隧道 城市既有道路 整体下沉 PECK公式 

分 类 号：TU99[建筑科学—市政工程]