隧道初期支护与围岩相互作用的时空演化特性

doi:10.13722/j.cnki.jrme.2017.0117

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摘要

支护–围岩动态相互作用机制是支护设计的核心问题。首先基于弹塑性软化模型和非关联流动法则，对深埋圆形隧道进行弹塑性解析，并进一步考虑喷射混凝土的时效特性和隧道施工过程特点，建立初期支护–围岩耦合模型，得到了在隧道开挖过程中，距开挖面不同距离的各分析断面支护与围岩的动态相互作用关系。通过具体实例计算，对型钢和格栅钢架结构在不同支护时机下的支护效果进行了对比分析，并研究喷射混凝土硬化特性对于围岩稳定性控制效果和支护结构安全性的影响，基于此给出了合理支护时机的确定方法。得到如下主要结论：格栅相对于型钢初期支护刚度较小，有利于围岩应力和位移的释放，但同时控制围岩变形能力较差，对于支护时机的变化也更为敏感；对于初期支护而言，喷射混凝土支护力的发展过程可分为缓慢增长、快速增长、增长减缓、趋于稳定4个阶段，且各阶段的分布比例随支护时机变化而有所不同；在支护结构施作早期，喷射混凝土承担的荷载可能大于其当前极限承载能力而导致其失稳；支护时机的选取应综合考虑钢架类型、喷射混凝土硬化特性及隧道掘进速率，在保证支护结构安全性的前提下达到理想的支护效果。该研究成果可对初期支护–围岩动态作用关系进行全过程预测，可使得收敛约束法在隧道支护设计中的应用更为准确，为隧道施工过程中支护结构设计提供理论依据。

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	孙振宇
	张顶立
	房倩
	台启民
	于富才

关键词 ：隧道工程；应变软化；应力释放；混凝土硬化；支护&ndash, 围岩动态相互作用；合理支护时机

Abstract：

The principle of dynamic interaction between surrounding rock and support is the core issue of tunnel support design. Based on the elastoplastic softening model and non-associated flow rule， the elastic-plastic analysis of deep buried circular tunnel is carried out. Then taking into account the aging characteristic of shotcrete and the process of tunnel construction，the coupling model of the interaction of primary support and surrounding rock is established. The dynamic interaction between surrounding rock and support of an analytical section at different places from the face is then obtained during tunnel excavation. Through a specific case study，the supporting effects of steel rib and lattice girder under different supporting opportunities are compared，and the effects of shotcrete hardening characteristic on the stability of surrounding rock control and the supporting structure safety are analyzed，thus the following conclusions are obtained. Lattice girder is more flexible than steel rib，which is favour of the release of surrounding rock stress and displacement，but less able to control surrounding rock deformation and more sensitive to the change of support opportunity. The development of shotcrete supporting force can be divided into four stages including slow growth，rapid growth，growth slowdown and stability，of which the distribution ratio for each stage varies with the supporting time. During the early stage of the supporting structure，the load on shotcrete can be greater than its current limit bearing capacity and leads to its failure. The selection of supporting opportunity should take the steel arch types，shotcrete hardening characteristic and tunnel advancing rate into consideration to achieve the ideal support effect under the premise of supporting safety. Dynamic interaction between primary support and surrounding rock can be forecast and the application of convergence confinement method in tunnel support design can be more accurate by the research results，thus provides a theoretical basis for the support design during tunnel construction process.

Key words： tunnel engineering strain softening stress relief concrete hardening dynamic interaction of support and surrounding rock reasonable supporting opportunity

引用本文:

孙振宇，张顶立，房倩，台启民，于富才. 隧道初期支护与围岩相互作用的时空演化特性[J]. 岩石力学与工程学报, 2017, 36(S2): 3943-3956.
SUN Zhenyu，ZHANG Dingli，FANG Qian，TAI Qimin，YU Fucai. Spatial and temporal evolution characteristics of interaction between primary support and tunnel surrounding rock. , 2017, 36(S2): 3943-3956.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0117 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/3943

[1] 张顶立，陈峰宾，房倩. 隧道初期支护结构受力特性及适用性研究[J]. 工程力学，2014，(7)：78–84.(ZHANG Dingli，CHEN Fengbin，FANG Qian. Study on mechanical characteristics and applicability of primary lining used in tunnel[J]. Engineering Mechanics，2014，(7)：78–84.(in Chinese))

[2] 蔡美峰，何满潮，刘东燕. 岩石力学与工程[M]. 北京：科学出版社，2002：327–328.(CAI Meifeng，HE Manchao，LIU Dongyan. Rock mechanics and engineering[M]. Beijing：Science Press，2002：327–328.(in Chinese))

[3] CARRANZA-TORRES C，FAIRHURST C. Application of the convergence-confinement method of tunnel design to rock masses that satisfy the Hoek-Brown failure criterion[J]. Tunnelling and Underground Space Technology，2000，15(2)：187–213.

[4] PARK K H，KIM Y J. Analytical solution for a circular opening in an elastic-brittle-plastic rock[J]. International Journal of Rock Mechanics and Mining Sciences，2006，43(4)：616–622.

[5] 侯公羽，李晶晶. 弹塑性变形条件下围岩-支护相互作用全过程解析[J]. 岩土力学，2012，33(4)：961–970.(HOU Gongyu，LI Jingjing. Analysis of complete process of interaction of surrounding rock and support under elastoplastic deformation condition[J]. Rock and Soil Mechanics，2012，33(4)：961–970.(in Chinese))

[6] 张常光，赵均海，张庆贺. 基于统一强度理论的深埋圆形岩石隧道收敛限制分析[J]. 岩土工程学报，2012，34(1)：110–114.(ZHANG Changguang，ZHAO Junhai，ZHANG Qinghe. Convergence- confinement analysis of deep circular rock tunnels based on unified strength theory[J]. Chinese Journal of Geotechnical Engineering，2012，34(1)：110–114.(in Chinese))

[7] 孙闯，张向东，李永靖. 高应力软岩巷道围岩与支护结构相互作用分析[J]. 岩土力学，2013，34(9)：2 601–2 607.(SUN Chuang，ZHANG Xiangdong，LI Yongjing. Analysis of interaction between surrounding rock and support structure in high stressed soft rock roadway[J]. Rock and Soil Mechanics，2013，34(9)：2 601–2 607.(in Chinese))

[8] ORESTE P P，PEILA D. Modelling progressive hardening of shotcrete in convergence-confinement approach to tunnel design[J]. Tunnelling and Underground Space Technology，1997，12(3)：425–431.

[9] 卞跃威，夏才初，肖维民，等. 考虑围岩软化特性和应力释放的圆形隧道黏弹塑性解[J]. 岩土力学，2013，34(1)：211–220.(BIAN Yuewei，XIA Caichu，XIAO Weimin，et al. Visco-elastoplastic solutions for circular tunnel considering stress release and softening behaviour of rocks[J]. Rock and Soil Mechanics，2013，34(1)：211–220.(in Chinese))

[10] 孙钧，朱合华. 软弱围岩隧洞施工性态的力学模拟与分析[J]. 岩土力学，1994，15(4)：20–23.(SUN Jun，ZHU Hehua. Mechanical simulation and analysis of behavior of soft and weak rocks in the construction of a tunnel opening[J]. Rock and Soil Mechanics，1994，15(4)：20–23.(in Chinese))

[11] PANET M，GUENOT A. Analysis of convergence behind the face of a tunnel[C]// Proceedings of the International Symposium on Tunnelling，IMM. London：[s. n. ]，1982：197–204.

[12] 姚国圣，李镜培，谷拴成. 考虑岩体扩容和塑性软化的软岩巷道变形解析[J]. 岩土力学，2009，30(2)：463–467.(YAO Guosheng，LI Jingpei，GU Shuangcheng. Analytic solution to deformation of soft rock tunnel considering dilatancy and plastic softening of rock mass[J]. Rock and Soil Mechanics，2009，30(2)：463–467.(in Chinese))

[13] FARMER I W. 岩石的工程性质[M]. 汪浩，译. 徐州：中国矿业大学出版社，1988：92–106.(FARMER I W. The engineering properties of rock[M]. Translated by WANG Hao. Xuzhou：China University of Mining and Technology Press，1988：92–106.(in Chinese))

[14] VLACHOPOULOS N，DIEDERICHS M S. Improved longitudinal displacement profiles for convergence confinement analysis of deep tunnels[J]. Rock Mechanics and Rock Engineering，2009，42(2)：131–146.

[15] ALEJANO L R，RODRIGUEZ-DONO A，VEIGA M. Plastic radii and longitudinal deformation profiles of tunnels excavated in strain- softening rock masses[J]. Tunnelling and Underground Space Technology，2012，30(1)：169–182.

[16] VLACHOPOULOS N，DIEDERICHS M S，MARINOS V，et al. Tunnel behaviour associated with the weak Alpine rock masses of the Driskos Twin Tunnel system，Egnatia Odos Highway[J]. Canadian Geotechnical Journal，2013，50(1)：91–120.

[17] BAY J A，STOKOE II K H. Field determination of stiffness and integrity of PCC members using the SASW method[C]// Proceedings of the Nondestructive Evaluation of Civil Structures and Materials Conference. Boulder：University of Colorado，1990：71–86.

[18] PAN Y W，DONG J J. Time-dependent tunnel convergence-I formulation of the model[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1991，28(6)：469–475.

[19] 徐帮树，杨为民，王者超，等. 公路隧道型钢喷射混凝土初期支护安全评价研究[J]. 岩土力学，2012，33(1)：248–254.(XU Bangshu，YANG Weimin，WANG Zhechao，et al. Study of initial support safety evaluation about shape steel reinforced shotcrete in highway tunnel[J]. Rock and Soil Mechanics，2012，33(1)：248–254.(in Chinese))

[20] 关宝树. 隧道力学概论[M]. 成都：西南交通大学出版社，1993：76–77.(GUAN Baoshu. Introduction of tunnel mechanics[M]. Chengdu：Southwest Jiaotong University Press，1993：76–77.(in Chinese))