多因素下竖向顶管施工引起的土体变形研究
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摘要
建立掘进机与土体间的摩擦力、后续管道与土体间的摩擦力、开挖面前顶管推力、土体损失四个因素下竖向顶管法施工的力学模型.前三个因素引起的土体变形解根据弹性力学Mindlin解得到;土体损失引起的土体变形解通过随机介质理论得到,最后二者相加获得多因素下总的土体变形理论解.通过算例对计算结果进行了分析,研究了开挖面前顶管推力的改变对土体变形的影响。研究结果表明,土体竖向位移的最大值随z的增大基本呈减小趋势;竖向顶管施工引起土体隆起的范围在距顶管横截面中心线D～10D之间,土体隆起值随着深度的增加而增加;水平位移的最大值出现在距竖向顶管横截面中垂线2.5D处;开挖面前顶管推力对竖向位移的影响范围主要在距顶管横截面中心线±2.5D之间,在影响范围内,其引起的竖向位移随开挖面前顶管推力的增加而逐渐增大;在0 Under the influence of four factors(friction force between soil and roadheader, friction force between soil and subsequent pipes, the thrust of the pipe in front of the excavation and soil loss), the mechanical model of construction of vertical pipe jacking method is built. Baseed on the Mindlin solutions in elastic mechanics, soil deformation caused by the first three factors are calculated. In addition, soil deformation caused by soil loss can be calculated according to stochastic medium theory. By superposing soil deformation of these two parts, the theoretical solution of total soil deformation under multiple factors can be calculated. The results are analyzed through an example, the influence of the change of frontal thrust in front of the excavation on soil deformation are studied. The results show that the maximum value of soil vertical displacement decreases with the increase of z. The range of the soil uplift zone caused by vertical pipe jacking construction is between D and 10 D from the centerline of the vertical pipe jacking cross section, the value of soil uplift increases with the increase of the depth. The maximum value of horizontal displacement appears at 2.5 D from the vertical line of the vertical pipe jacking cross section. In terms of the thrust of the pipe in front of the excavation, the influence range on the vertical displacement is mainly from-2.5 D to 2.5 D from the centerline line of the cross section. The vertical displacement caused by it increased with the thrust of the pipe in front of the excavation. The horizontal displacement caused by the thrust of the pipe in front of the excavation is mainly moves towards the vertical pipes when z is between 0 and 0.5 D and the value is low. However, when z is between 0.5 D and 4 D, it moves away from the vertical pipes and increases with the depth. Therefore,in the vertical pipe jacking construction, it is necessary to Concentrate more on the vertical displacement when it is±2.5 D from the vertical line of the cross section and the horizontal displacement when 0.5 D
引文
[1]董胜宪,罗树青.垂直顶升法在电厂取排水隧道工程中的应用[J].电力勘测设计,2012,(6):47-51,69.
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[14]冯海宁,温晓贵,魏纲,等.顶管施工对土体影响的现场试验研究[J].岩土力学,2003,24(5):781-785.
[15]周顺华,廖全燕,刘建国,等.矩形顶管隧道顶进过程的地层损失[J].岩石力学与工程学报,2001,20(3):342-345.
[16]MINDLIN R D.Force at a point in the interior of a semi-infinite solid[J].Physics,1936,7(5):195-201.
[17]魏纲,张世民,齐静静,等.盾构隧道施工引起的地面变形计算方法研究[J].岩石力学与工程学报,2006,25(s1):3317-3323.
[18]魏纲,魏新江,徐日庆.顶管工程技术[M].北京:化学工业出版社,2011.
[19]齐静静,徐日庆,魏纲.盾构施工引起土体三维变形的计算方法研究[J].岩土力学,2009,30(8):2442-2446.
[20]阳军生,刘宝琛,阳生权.竖井建设引起的地表移动及变形[J].岩石力学与工程学报,1999,18(3):291~293.
[21]阳军生,刘宝琛.沉桩引起的临近地表移动及变形[J].工程勘察,1999(3):1-3.
[2]PECK R B.Deep excavations and tunneling in soft ground[C]//The7th International Conference on Soil Mechanics and Foundation Engineering.Mexico:[s.n.],1969.
[3]LOGANATHAN N,POULOS H G.Analytical prediction for tunneling-induced ground movement in clays[J].Journal of geotechnical and geoenvironmental engineering,1998,124(9):846-856.
[4]ATTEWELL P B.Ground movements caused by tunnelling in soil[C]//Proc.Conf.on Large Ground Movements and Structures,Cardiff.London:Pentech Press,1978.812-948.
[5]魏纲,黄志义,徐日庆,等.顶管施工引起地面变形的计算方法研究[J].岩石力学与工程学报,2005,24(s2):5808-5815.
[6]阳军生,刘宝琛.城市隧道施工引起的地表移动及变形[M].北京:中国铁道出版社,2002.
[7]LITWINSZYN J.Fundamental principles of the mechanics of stochastic medium[C]//Proc.of 3 Conf.Theo.Appl.Mech.,Bongalore,India,1957.
[8]施成华,黄林冲.顶管施工隧道扰动区土体变形计算[J].中南大学学报(自然科学版),2005,36(2):323-328.
[9]龚尚龙,杨转运,陈思甜.采用随机介质理论分析超浅层曲线顶管施工引起的地表沉降[J].重庆交通学院学报,2005,24(6):95-98.
[10]乔宏伟,邓志辉.顶管施工中地面沉降的预测[J].西部探矿工程,2000(6):113-114.
[11]罗筱波,周健.多元线性回归分析法计算顶管施工引起的地面沉降[J].岩土力学,2003,24(1):130-134.
[12]方从启,孙钧.浅层顶管施工引起的土体移动[J].岩土力学,2000,21(1):36-41.
[13]方从启,李向红.浅层顶管施工引起地面沉降的预测[J].江苏大学学报(自然科学版),1999,20(6):5-8.
[14]冯海宁,温晓贵,魏纲,等.顶管施工对土体影响的现场试验研究[J].岩土力学,2003,24(5):781-785.
[15]周顺华,廖全燕,刘建国,等.矩形顶管隧道顶进过程的地层损失[J].岩石力学与工程学报,2001,20(3):342-345.
[16]MINDLIN R D.Force at a point in the interior of a semi-infinite solid[J].Physics,1936,7(5):195-201.
[17]魏纲,张世民,齐静静,等.盾构隧道施工引起的地面变形计算方法研究[J].岩石力学与工程学报,2006,25(s1):3317-3323.
[18]魏纲,魏新江,徐日庆.顶管工程技术[M].北京:化学工业出版社,2011.
[19]齐静静,徐日庆,魏纲.盾构施工引起土体三维变形的计算方法研究[J].岩土力学,2009,30(8):2442-2446.
[20]阳军生,刘宝琛,阳生权.竖井建设引起的地表移动及变形[J].岩石力学与工程学报,1999,18(3):291~293.
[21]阳军生,刘宝琛.沉桩引起的临近地表移动及变形[J].工程勘察,1999(3):1-3.