大口径顶管施工对地表沉降的影响分析
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摘要
分析顶管施工过程中对周围土体的影响尤为重要,过大的土体变形会对邻近道路和建筑物等构成一定的风险。结合杭州半山电厂—崇贤220 kV线路电缆隧道工程,采用有限元分析软件ABAQUS进行了数值模拟分析。通过修改模型摩阻力,支护压力等参数,得到了不同条件下的地表沉降规律。研究表明:地表沉降的模拟值与实测值比较吻合,机头隆起发生在顶管机头1.5D(D为管节外径)处,横断面土体沉降影响范围在轴线3D范围内,摩阻力主要影响顶管后方沉降,支护压力主要影响顶管机头前方的土体隆起。
Analyzing the influence of pipe jacking construction on the surrounding soil is especially important in that excessive soil deformation would pose a certain risk to neighboring roads and buildings. Numerical simulation analysis using finite element analysis software ABAQUS was made taking the case study of Hangzhou Banshan Power Plant-Chong Xian 220 kV line cable tunnel project into account. Ground surface settlement under different conditions was obtained by modifying the model friction, support pressure and other parameters. It is found that the simulated ground surface settlement is fairly close to the observed ones; the heave of pipe jacking machine head occurs at 1.5D(D is the outer diameter of the pipe joint) away from the head; the disturbance range of settlement along the cross-section axis is within a distance of 3D; and the frictional resistance mainly affects the ground surface settlement behind the pipe jacking while the support pressure mainly affects the ground surface heave ahead of the pipe head.
Analyzing the influence of pipe jacking construction on the surrounding soil is especially important in that excessive soil deformation would pose a certain risk to neighboring roads and buildings. Numerical simulation analysis using finite element analysis software ABAQUS was made taking the case study of Hangzhou Banshan Power Plant-Chong Xian 220 kV line cable tunnel project into account. Ground surface settlement under different conditions was obtained by modifying the model friction, support pressure and other parameters. It is found that the simulated ground surface settlement is fairly close to the observed ones; the heave of pipe jacking machine head occurs at 1.5D(D is the outer diameter of the pipe joint) away from the head; the disturbance range of settlement along the cross-section axis is within a distance of 3D; and the frictional resistance mainly affects the ground surface settlement behind the pipe jacking while the support pressure mainly affects the ground surface heave ahead of the pipe head.
引文
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[4] 魏纲,陈春来,余剑英.顶管施工引起的土体垂直变形计算方法研究[J].岩土力学,2007,28(3):619-624.
[5] 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.
[6] 林敏,张平之.铁路顶管施工中路基面沉降的研究[J].北京交通大学学报,2001,25(4):69-72.
[7] 黄宏伟,胡昕.顶管施工力学效应的数值模拟分析[J].岩石力学与工程学报,2003,22(3):400-406.
[8] 丛茂强,陈锦剑,王建华.基于注浆压力控制的混凝土顶管施工微扰动机理[J].上海交通大学学报,2013,47(6):867-871.
[9] 黄吉龙,陈锦剑,王建华,等.大口径顶管顶进过程的数值模拟分析[J].地下空间与工程学报,2008,4(3):489-493.
[2] NG R M C,LO K Y,ROWE R K.Analysis of field performance-the Thunder Bay tunnel[J].Canadian Geotechnical Journal,1986,23(1):30-50.
[3] LEE K M,ROWE R K.Finite element modelling of the three-dimensional ground deformations due to tunneling in soft cohesive soils:Part 2-results[J].Computers and Geotechnics,1990,10(2):87-109.
[4] 魏纲,陈春来,余剑英.顶管施工引起的土体垂直变形计算方法研究[J].岩土力学,2007,28(3):619-624.
[5] 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.
[6] 林敏,张平之.铁路顶管施工中路基面沉降的研究[J].北京交通大学学报,2001,25(4):69-72.
[7] 黄宏伟,胡昕.顶管施工力学效应的数值模拟分析[J].岩石力学与工程学报,2003,22(3):400-406.
[8] 丛茂强,陈锦剑,王建华.基于注浆压力控制的混凝土顶管施工微扰动机理[J].上海交通大学学报,2013,47(6):867-871.
[9] 黄吉龙,陈锦剑,王建华,等.大口径顶管顶进过程的数值模拟分析[J].地下空间与工程学报,2008,4(3):489-493.