类矩形盾构隧道施工对邻近地下管线的影响研究
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摘要
简化地下管线的三维力学计算模型,利用随机介质理论推导的土体沉降计算公式,得到类矩形盾构隧道施工对垂直交叉地下管线变形、弯矩、应力和应变的计算公式,通过算例分析土质条件、管线埋深和管线直径以及管壁对管线所受极限弯矩的影响。研究结果表明:管线极限弯矩受土质条件的影响较大,砂土中管线所受的最大极限弯矩大于黏土,但黏土中极限弯矩的影响范围更广;随着管线埋深的增加,管隧间距变小,隧道施工对管线的影响变大,管线所受的极限弯矩随之变大;管径和管壁的改变对管线所受极限弯矩有较大影响,管径的缩小造成管线的抗弯刚度减小,导致管线极限弯矩减小。
In this paper, the calculationformula of deformation, bending moment, stress and strain of underground pipeline with vertical intersection are obtained by the simplifiedthree-dimensional mechanical model with the soil settlement derived from stochastic medium theory under quasi-rectangular shield tunnel construction. In addition,the influence of the soil quality and theburied depth, the diameter and the wall thickness of the pipelineon the ultimate bending moment(UBM)of the pipelineare analyzed by numerical examples. The results show that the UBM of the pipeline is greatly affected by the soil conditionthat the maximum UBM in the sand is larger than that of the clay whereas the limit bending moment of the clay has a wider range of influence. With the increase of the buried depth of the pipeline, the pipe-to-pipe spacing becomes smaller, the influence of tunnel construction on the pipeline becomes larger, and the ultimate bending moment of the pipeline becomes larger. The change of pipe diameter and pipe wall has a greater influence on the UBM of the pipeline that the reduced pipe diameter leads to the bending stiffnesss, hortage, which result in a reduction in the UBM of the pipeline.
In this paper, the calculationformula of deformation, bending moment, stress and strain of underground pipeline with vertical intersection are obtained by the simplifiedthree-dimensional mechanical model with the soil settlement derived from stochastic medium theory under quasi-rectangular shield tunnel construction. In addition,the influence of the soil quality and theburied depth, the diameter and the wall thickness of the pipelineon the ultimate bending moment(UBM)of the pipelineare analyzed by numerical examples. The results show that the UBM of the pipeline is greatly affected by the soil conditionthat the maximum UBM in the sand is larger than that of the clay whereas the limit bending moment of the clay has a wider range of influence. With the increase of the buried depth of the pipeline, the pipe-to-pipe spacing becomes smaller, the influence of tunnel construction on the pipeline becomes larger, and the ultimate bending moment of the pipeline becomes larger. The change of pipe diameter and pipe wall has a greater influence on the UBM of the pipeline that the reduced pipe diameter leads to the bending stiffnesss, hortage, which result in a reduction in the UBM of the pipeline.
引文
[1]ATTEWELL P B,YEATES J,SELBY A R.Soil movements induced by tunnelling and their effects on pipelines and structures[M].London:Blackie&Son Ltd.,1986.
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[4]魏纲,黄文,姜鑫.地面出入式盾构开挖对邻近地下管线的影响分析[J].铁道科学与工程学报,2017,14(9):1934-1941.
[5]高丙丽.地铁隧道暗挖施工对既有管线的变形影响规律及其控制技术[J].现代隧道技术,2014,51(4):96-101.
[6]王海涛,金慧,袁大军.砂土地层隧道施工对埋地管道影响的模型试验研究[J].土木工程学报,2017,50(s2):118-126.
[7]魏纲,崔程虹,蔡诗淇,等.类矩形盾构施工引起地下管线竖向位移计算方法研究[J].市政技术,2018,36(2):86-90.
[8]魏纲,张鑫海,徐银锋.考虑多因素的类矩形盾构施工引起土体竖向位移研究[J].岩石力学与工程学报,2018,37(1):199-208.
[9]魏纲,朱奎.顶管施工对邻近地下管线的影响预测分析[J].岩土力学,2009,30(3):825-831.
[10]陈春来,赵城丽,魏纲,等.基于Peck公式的双线盾构引起的土体沉降预测[J].岩土力学,2014,35(8):2212-2218.
[11]汤继新,王柳善,季昌,等.类矩形土压平衡盾构掘进引起的地层变形三维数值分析[J].华东交通大学学报,2016,33(1):9-15.
[12]中国市政工程华北设计研究院.给水排水设计手册:第12册器材与装置[M].北京:中国建筑工业出版社,2001.
[2]王涛,魏纲,徐日庆.隧道开挖对邻近地下管线的影响预测分析[J].岩土力学,2006,27(s1):483-486.
[3]张桓,张子新.盾构隧道开挖引起既有管线的竖向变形[J].同济大学学报(自然科学版),2013,41(8):1172-1178.
[4]魏纲,黄文,姜鑫.地面出入式盾构开挖对邻近地下管线的影响分析[J].铁道科学与工程学报,2017,14(9):1934-1941.
[5]高丙丽.地铁隧道暗挖施工对既有管线的变形影响规律及其控制技术[J].现代隧道技术,2014,51(4):96-101.
[6]王海涛,金慧,袁大军.砂土地层隧道施工对埋地管道影响的模型试验研究[J].土木工程学报,2017,50(s2):118-126.
[7]魏纲,崔程虹,蔡诗淇,等.类矩形盾构施工引起地下管线竖向位移计算方法研究[J].市政技术,2018,36(2):86-90.
[8]魏纲,张鑫海,徐银锋.考虑多因素的类矩形盾构施工引起土体竖向位移研究[J].岩石力学与工程学报,2018,37(1):199-208.
[9]魏纲,朱奎.顶管施工对邻近地下管线的影响预测分析[J].岩土力学,2009,30(3):825-831.
[10]陈春来,赵城丽,魏纲,等.基于Peck公式的双线盾构引起的土体沉降预测[J].岩土力学,2014,35(8):2212-2218.
[11]汤继新,王柳善,季昌,等.类矩形土压平衡盾构掘进引起的地层变形三维数值分析[J].华东交通大学学报,2016,33(1):9-15.
[12]中国市政工程华北设计研究院.给水排水设计手册:第12册器材与装置[M].北京:中国建筑工业出版社,2001.
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