盾构下穿沪宁高速公路路基加固及变形影响分析  

Analysis of subgrade reinforcement and deformation influence of shield tunneling under Shanghai-Nanjing Expressway

作　　者：吴鑫域 程姿洋 王文恺 杨平[1] WU Xinyu;CHENG Ziyang;WANG Wenkai;YANG Ping(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;Jiangsu Jianke Engineering Consulting Co.Ltd.,Nanjing 210019,China;The Eighth Engineering Co.Ltd.,China Communications First Public Bureau,Tianjin 300170,China)

机构地区：[1]南京林业大学土木工程学院,南京210037 [2]江苏建科工程咨询有限公司,南京210019 [3]中交一公局第八工程有限公司,天津300170

出　　处：《林业工程学报》2025年第2期165-172,共8页Journal of Forestry Engineering

基　　金：国家自然科学基金(51709088)。

摘　　要：以苏州某盾构隧道下穿沪宁高速公路为背景,高速公路修建期间采用了搅拌桩进行路基加固处理,利用Midas/GTS软件开展模拟计算,采用经实测数据验证的模拟方法,分析了不同掘进参数、不同水泥土加固范围及双线盾构隧道掘进对路基变形的影响。运用Peck公式计算盾构右线通过后的沉降槽宽度系数(i)为8.13 m、实测值为8 m,最大沉降(S_(max))理论计算为8.41 mm、实测值为7.48 mm,理论计算与实测相差较小;且数值模拟与实测相差也较小,验证了数值模拟的合理性。工作面压力与同步注浆压力的变化对路基变形的影响程度较大,千斤顶推力的变化对路基变形影响程度较小;路基沉降最大值随隧道埋深的增加衰减性减小;路基最大沉降随水泥土加固体强度增加而减小,随水泥土加固长度和深度的增加而减小,加固体加固范围达到长87.5 m、深6 m时,为合理加固范围,可满足路基变形要求。A shield tunnel in Suzhou under the Shanghai-Nanjing Expressway was selected as the background,and the mixing pile was used to strengthen the subgrade during the construction of the expressway.The correctness of the simulation calculation method using Midas/GTS numerical software was verified by the actually measured results.The effects of different driving parameters,different cement-soil-reinforcement range and double-line shield tunneling on subgrade deformation were analyzed.Peck formula was used to calculate the width coefficient(i)of the settling trough after the right line of shield was 8.13 m,and the measured value was 8 m.The maximum settlement(S_(max))was theoretically calculated to be 8.41 mm,and the measured value was 7.48 mm.There was little difference between theoretical formula calculation and actual measurement values,and the difference between numerical simulation and actual measurement results was also small.The variation of working face pressure and synchronous grouting pressure had great influence on the deformation of subgrade,but the change of jack thrust had little influence on the deformation of subgrade.The attenuation of maximum subgrade settlement decreased with the increase of tunnel depth.The maximum settlement of subgrade decreased with the increase of cement-soil-solid strength.It decreased with the increase of cement-soil reinforcement length and depth.When the solidity body are reinforced to a length of 87.5 m and a depth of 6 m,it could meet the requirements of subgrade deformation.In addition to reducing the deformation of the subgrade by strengthening the soil layer,when the subgrade had a slightly large settlement,the pressure of the soil bin could be increased to resist the soil in front of the subgrade,reducing the deformation.Secondly,the excavation speed of the shield should not be too fast,because too fast speed increased the disturbance range of the cutterhead on the soil and caused a long time of consolidation settlement,which is not conducive to deformation control.Thi

关 键 词：盾构隧道 下穿高速公路 路基加固 路基变形 掘进参数 

分 类 号：TU455.43[建筑科学—岩土工程]