隧道开挖对邻近桩基变形及承载能力影响的弹塑性解答

doi:10.13722/j.cnki.jrme.2015.1669

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (527 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract Spherical and cylindrical cavity expansion/contraction analyses are employed for estimating the pile-tunnel interaction. Firstly，a cylindrical cavity contraction model was developed to simulate the process of tunnel excavation based on the Mohr-Coulomb yield criterion，and the elasto-plastic horizontal displacement of adjacent single pile was calculated based on Pasternak foundation model. Then，an elasto-plastic method for evaluating the pile load capacity affected by tunneling was proposed. The total load capacity of pile was determined as the summation of the contribution from the ultimate end-bearing capacity and the ultimate shaft friction. A spherical cavity expansion model in the infinite medium was used to account for the ultimate cavity pressure at pile tip，and then the ultimate end-bearing capacity of the pile was obtained. The equivalent average shear stress along the pile length was estimated using the modified ?-method，and the ultimate pile shaft friction was obtained. The modified method considers the reduction of the shear stress of the pile shaft due to tunneling. On this basis，the elasto-plastic effect of tunneling on stress in surrounding soil was calculated. The distance effect of pile to tunnel on the pile load capacity was analyzed. Defining that the pile failure occurs when the pile capacity is reduced to 85%，the relationship between the distance of tunnel to pile tip and critical tunnel volume loss is analyzed. The parametric studies were performed to discuss the influence of various factors on this relationship，including the soil cohesion，internal friction angle，density，soil modulus and the pile diameter. Results show that，the elasto-plastic cylindrical cavity contraction model is capable in predicting the lateral displacement and bending moment of pile due to adjacent tunneling. A plastic zone is formed in a certain range after the tunneling. The effective soil stress reduction factor Rp in this area is less than 1，which indicates that the pile bearing capacity is reduced，while the pile capacity outside the plastic zone is not influenced by the tunneling. The distance of tunnel to pile has a significant effect on the load capacity of pile. If the tunnel-pile distance is a constant，the pile end-bearing capacity reduction factor Rqb will gradually approach 1 with the increase of the tunnel depth，which indicates that a deeper tunnel is more favorable for pile bearing capacity. There is a linear relationship between the critical tunnel volume loss at which pile failure occurs and the square of tunnel-pile tip distance. The load capacity of pile is sensitive to the soil modulus.

Key words： tunneling engineering pile deformation pile load capacity cavity expansion(contraction) theory modified-method elasto-plastic solution

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHANG Zhiguo1
	2
	3
	XU Chen1
	GONG Jianfei4

Cite this article:

ZHANG Zhiguo1,2,3, et al. An elasto-plastic solution of pile deflection and pile load capacity due to adjacent tunneling[J]. , 2017, 36(1): 208-222.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1669 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/I1/208

[1]	MAIR R J，TAYLOR R N. Prediction of clay behaviour around tunnels using plasticity solutions[C]// Proceedings of the Wroth Memorial Symposium Held at St. Oxford：Thomas Telford，1993：449-463.
[2]	YU H S， ROWE R K. Plasticity solutions for soil behaviour around contracting cavities and tunnels[J]. International Journal for Numerical and Analytical Methods in Geomechanics，1999，23(12)：1 245- 1 279.
[3]	胡云世，孙庆，韩进宝. 圆柱孔收缩的线弹性-完全塑性解及其应用[J]. 岩土力学，2012，33(5)：1 438-1 444.(HU Yunshi，SUN Qing，HAN Jinbao. Linear elastic-perfectly plastic solution for cylindrical cavity contraction and its application[J]. Rock and Soil Mechanics，2012，33(5)：1 438-1 444.(in Chinese))
[4]	曾英俊，杨敏，孙庆. 圆柱孔收缩的弹塑性解及其在隧道工程中的应用[J]. 同济大学学报：自然科学版，2012，40(10)：1 480- 1 485.(ZENG Yingjun，YANG Min，SUN Qing. Elastic-plastic solution for cylinder cavity contraction and its application to tunnel engineering[J]. Journal of Tongji University：Natural Science，2012，40(10)：1 480-1 485.(in Chinese))
[5]	VESIC A S. Expansion of cavities in infinite soil mass[J]. Journal of Soil Mechanics and Foundations Division，1972，98(3)：265-290.
[6]	DAVIS R O，SCOTT R F，MULLENGER G. Rapid expansion of a cylindrical cavity in a rate-type soil[J]. International Journal for Numerical and Analytical Methods in Geomechanics，1984，8(2)：125-140.
[7]	RANDOLPH M F，DOLWIN R，BECK R，et al. Design of driven piles in sand[J]. Géotechnique，1994，44(3)：427-448.
[8]	RANDOLPH M F，CARTER J P，WROTH C P. Driven piles in clay-the effects of installation and Subsequent consolidation[J]. Géotechnique，1979，29(2)：361-393.
[9]	YU H S. Cavity Expansion Methods in Geomechanics[M]. Dordrecht：Kluwer Academic，2000：275-308.
[10]	俞峰，陆世英，张世民. 砂性土中桩端荷载-沉降关系的模拟[J]. 岩土工程学报，2005，27(12)：1 425-1 429.(YU Feng，LU Shiying，ZHANG Shimin. Modeling on pile-tip performance in sandy soils[J]. Chinese Journal of Geotechnical Engineering，2005，27(12)：1 425- 1 429.(in Chinese))
[11]	郑俊杰，聂重军，鲁燕儿. 基于土塞效应的柱形孔扩张问题解析解[J]. 岩石力学与工程学报，2006，25(增2)：4 004-4 008.(ZHENG Junjie， NIE Chongjun，LU Yaner. Analytical solutions of cylindrical cavity expansion problems considering plugging effects[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.2)：4 004-4 008. (in Chinese))
[12]	MANANDHAR S，YASUFUKU N. Vertical bearing capacity of tapered piles in sands using cavity expansion theory[J]. Soils and Foundations，2013，53(6)：853-867.
[13]	CHENG C Y，DASARI G R，CHOW Y K，et al. Finite element analysis of tunnel-soil-pile interaction using displacement controlled model[J]. Tunnelling and Underground Space Technology，2007，22(4)：450-466.
[14]	LEE C J. Three-dimensional numerical analyses of the response of a single pile and pile groups to tunnelling in weak weathered rock[J]. Tunnelling and Underground Space Technology，2012，32(11)：132-142.
[15]	朱逢斌，杨平，ONG C W. 盾构隧道开挖对邻近桩基影响数值分析[J]. 岩土工程学报，2008，32(2)：298-302.(ZHU Fengbin，YANG Ping，ONG C W. Numerical analysis on influence of shield tunnel excavation to neighboring pile[J]. Chinese Journal of Geotechnical Engineering，2008，32(2)：298-302.(in Chinese))
[16]	韩进宝，熊巨华，孙庆，等. 邻近桩基受隧道开挖影响的多因素三维有限元分析[J]. 岩土工程学报，2011，33(增2)：339-344.(HAN Jinbao，XIONG Juhua，SUN Qing，et al. Multi-factor three- dimensional finite element analysis of effects of tunnel construction on adjacent pile foundation[J]. Chinese Journal of Geotechnical Engineering，2011，33(Supp.2)：339-344.(in Chinese))
[17]	王丽，郑刚. 盾构法开挖隧道对桩基础影响的有限元分析[J]. 岩土力学，2011，32(增1)：704-712.(WANG Li，ZHENG Gang. Finite element analysis of effects of shield driven tunneling on pile foundation[J]. Rock and Soil Mechanics，2011，32(Supp.1)：704-712.(in Chinese))
[18]	CHEN L T，POULOS H G，LOGANATHAN N. Pile responses caused by tunneling[J]. Journal of Geotechnical and Geoenvironmental Engineering，1999，125(3)：207-215.
[19]	HUANG M S，ZHANG C R，LI Z. A simplified analysis method for the influence of tunneling on grouped piles[J]. Tunnelling and Underground Space Technology，2009，24(4)：410-422.
[20]	MU L L，HUANG M S，FINNO R J. Tunnelling effects on lateral behavior of pile rafts in layered soil[J]. Tunnelling and Underground Space Technology，2012，28(3)：192-201.
[21]	熊巨华，王远，刘侃，等. 隧道开挖对邻近单桩竖向受力特性影响[J]. 岩土力学，2013，34(2)：475-482.(XIONG Juhua，WANG Yuan，LIU Kan，et al. Effects of tunneling on vertical bearing behaviors of adjacent single pile[J]. Rock and Soil Mechanics，2013，34(2)：475-482.(in Chinese))
[22]	张治国，徐晨，宫剑飞. 考虑桩侧土体三维效应和地基剪切变形的隧道开挖对邻近桩基影响分析[J]. 岩土工程学报，2016(待刊). (ZHANG Zhiguo，XU Chen，GONG Jianfei. Simplified analysis of pile deflection due to adjacent tunneling considering shearing deformation of foundation and 3D influences of lateral soils beside the pile[J]. Chinese Journal of Geotechnical Engineering，2016(to be pressed).(in Chinese))
[23]	NG C W W，LU H，PENG S Y. Three-dimensional centrifuge modelling of the effects of twin tunnelling on an existing pile[J]. Tunnelling and Underground Space Technology，2013，35(4)：189-199.
[24]	NG C W W，SOOMRO M A，HONG Y. Three-dimensional centrifuge modelling of pile group responses to side-by-side twin tunnelling[J]. Tunnelling and Underground Space Technology，2014，43(7)：350-361.
[25]	MARSHALL A M. Tunnelling in sand and its effect on pipelines and piles[Ph. D. Thesis][D]. Cambridge：University of Cambridge，2009.
[26]	MARSHALL A M. Tunnel-pile interaction analysis using cavity expansion methods[J]. Journal of Geotechnical and Geoenvironmental Engineering，2012，138(10)：1 237-1 246.
[27]	MARSHALL A M，HAJI T. An analytical study of tunnel-pile interaction[J]. Tunnelling and Underground Space Technology，2015，45(1)：43-51.
[28]	LOGANATHAN N，POULOS H G. Analytical prediction for tunneling-induced ground movements in clays[J]. Journal of Geotechnical and Geoenvironmental Engineering，1998，124(9)：846-856.
[29]	JACOBSZ S W. The effects of tunnelling on piled foundations[Ph. D. Thesis][D]. Cambridge：University of Cambridge，2002.
[30]	BOLTON M D. Discussion on the strength and dilatancy of sands[J]. Géotechnique，1987，37(2)：219-226.
[31]	YU H S，HOULSBY G T. Finite cavity expansion in dilatant soils：loading analysis[J]. Geotechnique，1991，41(2)：173-183.
[32]	BOLTON M D. The strength and dilatancy of sands[J]. Géotechnique， 1986，36(1)：65-78.
[33]	LEE R G，TURNER A J，WHITWORTH L J. Deformations caused by tunneling beneath a piled structure[C]// Proc. of the 13th ICSMFE. New Delhi：[s. n.]，1994：873-878.
[34]	POULOS H G，STEWART D P，LOGANATHAN N. Centrifuge model testing of tunnelling-induced ground and pile deformations[J]. Géotechnique，2000，50(50)：283-294.