通过将u-p模型嵌入有限元程序建立了地面爆炸荷载下钢顶管的动态响应模型，研究了饱和土中钢顶管在地面爆炸荷载作用下的动力响应问题.以钢顶管的位移响应为主要评价指标，研究了炸药量、起爆位置、钢顶管埋置深度以及顶管半径等参数对于钢顶管位移响应的影响.研究结果表明顶管竖向位移随炸药量增大,顶管半径的增大会降低顶管在爆炸荷载下的承载能力，适当提高埋深可以显著增强顶管在地面爆炸荷载作用下的抗爆能力.此外，随着偏移距离的增大，顶管竖向位移逐渐降低，最终在爆炸荷载作用下微量上浮，顶管的水平位移也随偏移距离先增大后减小.
A coupled numerical model is established by adopting the u-p model. The dynamic response of pipe jacking in saturated soil under surface explosion is investigated in detail. A comprehensive parametric study is carried out to study effect of explosive charge, explosion offset, embedment depth and radius of the pipe jacking. The results show that the vertical displacement of pipe jacking increases with explosive charge. The stability capacity of the pipe jacking under surface explosion decreases as the pipe radius increases. Increasing the buried depth of pipe jacking can significantly enhance the anti-explosion ability of pipe jacking under surface explosion. In additioin, the vertical displacment of the pipe jacking decreases as the off-set distance increases. The pipe jacking rises slightly under surface explosion eventually. And the horizontal displacement increases firstly and then decreases as off-set distance increases.
［1］黄清猷. 地下管道计算［M］.武汉: 湖北科学技术出版社, 1991.
HUANG Qingyou. Underground pipeline calculation ［M］. Wuhan: Hubei Science and Technology Press, 1991.
［2］刘建民, 陈文涛. 爆炸荷载下埋地管道动力响应分析研究［J］. 工程爆破, 2008, 14(2): 20-24.
LIU Jianmin, CHEN Wentao. Dynamic response study of buried pipeline subjected to blast loads［J］. Engineering Blasting, 2008, 14(2): 20-24.
［3］梁政, 张澜, 张杰. 地面爆炸载荷下埋地管道动力响应分析［J］. 安全与环境学报, 2016, 16(3): 158-163.
LIANG Zheng, ZHANG Lan, ZHANG Jie. Dynamic response analysis of the buried pipeline under surface explosion［J］. Journal of Safety and Environment, 2016, 16 (3): 158-163.
［4］YANG Y, XIE X, WANG R. Numerical simulation of dynamic response of operating metro tunnel induced by ground explosion［J］. Journal of Rock Mechanics and Geotechnical Engineering, 2010, 2(4): 373-384.
［5］WANG Z, LU Y, HAO H, et al. A full coupled numerical analysis approach for buried structures subjected to subsurface blast［J］. Computers & Structures, 2005, 83(4-5): 339-356.
［6］JIANG N, ZHOU C. Blasting vibration safety criterion for a tunnel liner structure［J］. Tunnelling and Underground Space Technology, 2012, 32: 52-57.
［7］SHIN J H, MOON H G, CHAE S E. Effect of blast-induced vibration on existing tunnels in soft rocks［J］. Tunnelling and Underground Space Technology, 2011, 26(1): 51-61.
［8］YU H, YUAN Y, YU G, et al. Evaluation of influence of vibrations generated by blasting construction on an existing tunnel in soft soils［J］. Tunnelling and Underground Space Technology, 2014, 43: 59-66.
［9］YU H, WANG Z, YUAN Y, et al. Numerical analysis of internal blast effects on underground tunnel in soils［J］. Structure and Infrastructure Engineering, 2016, 12(9): 1090-1105.
［10］KOURETZIS G P, BOUCKOVALAS G D, GANTES C J. Analytical calculation of blast-induced strains to buried pipelines［J］. International Journal of Impact Engineering, 2007, 34(10): 1683-1704.
［11］FELDGUN V R, KOCHETKOV A V, KARINSKI Y S, et al. Blast response of a lined cavity in a porous saturated soil［J］. International Journal of Impact Engineering, 2008, 35(9): 953-966.
［12］DE A, ZIMMIE T F. Centrifuge modeling of surface blast effects on underground structures［J］. Geotechnical Testing Journal, 2007, 30(5): 427-431.
［13］DE A, MORGANTE A N, ZIMMIE T F. Mitigation of blast effects on underground structure using compressible porous foam barriers［C］//Poromechanics V: Proceedings of the Fifth Biot Conference on Poromechanics. Vienna, Austria: ASCE, 2013: 971-980.
［14］LIAO C C, TONG D G, CHEN L H. Pore pressure distribution and momentary liquefaction in vicinity of impermeable slope-type breakwater head［J］. Applied Ocean Research, 2018, 78: 290-306.
［15］LI M G, CHEN J J, WANG J H, et al. Comparative study of construction methods for deep excavations above shield tunnels［J］. Tunnelling and Underground Space Technology, 2008, 71: 329-339.
［16］LI M G, WANG J H, CHEN J J, et al. Responses of a newly built metro line connected to deep excavations in soft clay［J］. Journal of Performance of Constructed Facilities, 2017, 31(6): 04017096-1-10.
［17］ZHOU X L. WANG J H, LU J F. Transient foundation solution of saturated soil to impulsive concentrated loading［J］. Soil Dynamics and Earthquake Engineering, 2002, 22(4): 273-281.
［18］HOLMQUIST G R. LS-DYNA keyword user’s manual［EB/OL］. (2013-08-08)［2019-08-06］. http://www.dynamore.de/en/downloads/manuals.
［19］WANG Z, LU Y, HAO H. Numerical investigation of effects of water saturation on blast wave propagation in soil mass［J］. Journal of Engineering Mechanics, 2004, 130(5): 551-561.
［20］YANKELEVSKY D Z, KARINSKI Y S, FELDGUN V R. Re-examination of the shock wave’s peak pressure attenuation in soils［J］. International Journal of Impact Engineering, 2011, 38(11): 864-881.
［21］JAYASINGHE L B, THAMBIRATNAM D P, PERERA N, et al. Computer simulation of underground blast response of pile in saturated soil［J］. Computers & Structures, 2013, 120: 86-95.
［22］ZIENKIEWICZ O C, CHANG C T, BETTESS P. Drained, undrained, consolidating and dynamic behaviour assumptions in soils［J］. Geotechnique, 1980, 30(4): 385-395.
