This article begins with simulation of the static pressure pile driving process with FLAC3D based on the cavity expansion theory, and compares the results of numerical simulation and analytical calculation. The calculated values and the trends of numerical simulations and analytical solutions are consistent. Therefore, simulation of the effect of pile driving friction on the displacement penetration method helps produce results close to practice in the entire pile driven process calculation. The pile driving calculation of the resultant effects on the deformation and inner force of the nearby tunnel with depth of 4, 8, 12, 16 and 20 m draws the conclusion that static pressure pile driving has an obvious effect on the deformation of the nearby tunnels. As the depths increases, displacement of the tunnel structure increases, which mainly consists of the displacement in the horizontal direction. The maximum tunnel structure displacement reaches 11.55 mm when the pile driving depth is 20 m. Meanwhile, the pile driving process results in tunnel deflection: counterclockwise (away from the pile) deflection when the pile driving depth is 4, 8, 12 and 16 m; clockwise (toward the pile) deflection when the pile driving depth is 20 m. As the pile driving depth increases, the additional bending moment distribution of the tunnel structure changes gradually from vertically axial symmetry to laterally axial symmetry. The tunnel bending moment turns counterclockwise (toward the tunnel) after pile driving and for most tunnel structures, the absolute values of bending moment tend to decrease.
QIN Shi-wei, ZHOU Yan-kun, MO Long
. Influences of Driving Pile on Neighboring Tunnel[J]. Journal of Shanghai University, 2013
, 19(5)
: 527
-533
.
DOI: 10.3969/j.issn.1007-2861.2013.05.016
[1] 姚孟祥. 沉桩挤土圆孔扩张理论研究与数值模拟分析[D]. 广州: 华南理工大学, 2011.
[2] 王浩, 魏道垛. 表面约束下的沉桩挤土效应数值模拟研究[J]. 岩土力学, 2002, 23(1): 107-110.
[3] 徐建平, 周健, 许朝阳, 等. 沉桩挤土效应的数值模拟[J]. 工业建筑, 2000, 30(7): 1-6.
[4] 陈军, 杜守继, 沈水龙, 等. 静压桩挤土对既有隧道的影响及施工措施研究[J]. 土木工程学报, 2011, 44(增刊):81-84.
[5] 许朝阳, 周健. 软粘土中沉桩效应的模型试验研究及数值模拟[J]. 土工基础, 2000, 14(4): 20-24.
[6] Mabsout M E, Sasdek S M, Smayra T E. Pile driving by numerical cavity expansion [J]. International Journal for Numerical and Analytical Methods
in Geomechanics, 1999, 23(11): 1121-1140.
[7] 罗战友, 王伟堂, 刘薇. 桩-土界面摩擦对静压桩挤土效应的影响分析[J]. 岩石力学与工程学报, 2005, 24(18): 3299-3304.
[8] 郑颖人, 龚晓南. 岩土塑性力学基础[M]. 北京: 中国建筑工业出版社, 1989.
[9] Carter J P, Randolph M F, Wroth C P. Stress and pore pressure changes in clay during and after the expansion of a cylindrical cavity [J]. International
Journal for Numerical and Analysis Method in Geomechanics, 1979(3): 305-322.
[10] 刘裕华, 陈征宙, 彭志军, 等. 应用圆孔柱扩张理论对预制管桩的挤土效应分析[J]. 岩土力学, 2007, 28(10): 2167-2182.