超大断面隧道开挖围岩荷载释放过程的模型试验研究

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摘要以兰渝铁路两水隧道为工程背景，进行超大断面铁路隧道开挖支护的大比尺三维地质力学模型试验，对开挖过程中的围岩荷载释放过程进行研究。根据工程现场地质情况研制满足相似要求的新型模型试验相似材料，经室内试验验证，该相似材料与原岩材料的力学性质有很好的相似性，满足试验要求。结合现场实际工况在模型试验不同区段采用不同的开挖支护工法，首先研究全断面及台阶法开挖情况下的围岩荷载释放过程，通过试验数据的分析，揭示不同开挖工法隧道围岩荷载释放全过程的特点和差异。相同开挖工法下，同一断面上不同位置的荷载释放过程存在很大差异；同样，不同开挖工法条件下同一位置的围岩荷载释放过程也不尽相同。其次，掌子面前方围岩受开挖影响会在局部发生先行荷载集中，先行荷载集中程度与开挖工法和断面形式有很大关系，开挖面前方荷载集中程度过高会加剧掌子面围岩的挤出效应，不利于围岩的稳定。最后，通过有无支护开挖情况下围岩荷载释放过程的对比，说明施作支护能够有效缓解开挖过程中的掌子面先行荷载集中现象，减少荷载释放总量，优化隧道围岩荷载释放过程。

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关键词 ：隧道工程, 施工过程, 荷载释放, 开挖支护, 相似材料, 模型试验

Abstract：Against the background of the Liangshui tunnel of Lanzhou—Chongqing line and based on 3D large-scale geomechanical model test of excavation and support on large cross-section tunnel，the process of surrounding rock load releasing during tunnel excavation is studied. New similar material is developed according to the field geological condition，which is proved by the laboratory tests to be similar to original rock materials on mechanical properties and meets the test requirement. Construction methods of excavation and support on different sections are various and the load releasing processes of surrounding rock on full-face excavation and bench-cut excavation are compared firstly. Through analyzing the test data，the features and differences of load releasing processes with different excavation methods are revealed. There are great differences in load releasing processes at different locations of the same section using the same excavation method. Meanwhile，the load releasing process at the same locations of the same section are various when different excavation methods are used. Secondly，the phenomenon of first load concentration occurs in front of tunnel face affecting by the excavation. The degree of first load concentration is related with the excavation method and section form. High degree of load concentration in front of tunnel face would aggravate the crowding-out effect，which is unfavorable to surrounding rock stability. Lastly，by comparing the load releasing processes of support excavation and non-support excavation，it is known that support can response the first load concentration effectively，reduce the load releasing amount，and optimize the load releasing process of surrounding rock in construction.

Key words： tunnel engineering construction process load releasing excavation and support similar material model test

收稿日期: 2011-09-15

引用本文:

赵勇1，李术才2，赵岩2，3，李利平2. 超大断面隧道开挖围岩荷载释放过程的模型试验研究[J]. 岩石力学与工程学报, 2012, 31(s2): 3821-3830.
ZHAO Yong1，LI Shucai2，ZHAO Yan2，3，LI Liping2. MODEL TEST STUDY OF SURROUNDING ROCK LOAD RELEASING DURING SUPER-LARGE SECTION TUNNEL EXCAVATION. , 2012, 31(s2): 3821-3830.

链接本文:

http://www.rockmech.org/CN/Y2012/V31/Is2/3821

[1]	关宝树. 隧道工程设计要点集[M]. 北京：人民交通出版社，2003：2-19.(GUAN Baoshu. Essentials of construction in tunneling engineering[M]. Beijing：China Communications Press，2003：2-19.(in Chinese)). " target="_blank">
[5]	PELLI F，KAISER P K，MORGERNSTERN N R. Three-dimensional simulation of rock liner interaction near tunnel face[C]// Proceedings of the 2nd International Symposium on Numerical Models in Geomechanics. Ghent，Belgium：[s. n.]，1986：359-368. " target="_blank">
[8]	朱维申，李术才，白世伟，等. 施工过程力学原理的若干发展和工程实例分析[J]. 岩石力学与工程学报，2003，22(10)：1 586-1 591. (ZHU Weishen，LI Shucai，BAI Shiwei，et al. Some developments of principles for construction process mechanics and some case history studies[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(10)：1 586-1 591.(in Chinese)) " target="_blank">
[12]	晏启祥，何川，姚勇. 软岩隧道施工特性及其动态力学行为研究[J]. 岩石力学与工程学报，2006，25(3)：572-577.(YAN Qixiang，HE Chuan，YAO Yong. Study on construction characteristics and dynamic behavior of soft rock tunnel[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(3)：572-577.(in Chinese))
[15]	张素敏，宋玉香，朱永全. 隧道围岩特性曲线数值模拟与分析[J].岩土力学，2004，25(3)：455-458.(ZHANG Sumin，SONG Yuxiang，ZHU Yongquan. Numerical simulation and analysis of ground reaction curve[J]. Rock and Soil Mechanics，2004，25(3)：455-458.(in Chinese)) " target="_blank">
[17]	唐仪兴，张玉军. 近距离双隧道开挖与支护的稳定性有限元计算[J]. 岩土力学，1999，20(1)：87-92.(TANG Yixing，ZHANG Yujun. Plane viscoelasto-plastic FEM calculation for the stability of the excavation and lining structure of a nearby double tunnel[J]. Rock and Soil Mechanics，1999，20(1)：87-92.(in Chinese)) " target="_blank">
[2]	孙钧. 地下工程设计理论与实践[M]. 上海：上海科学技术出版社，1996：1-35.(SUN Jun. Design theory of underground engineering and application[M]. Shanghai：Shanghai Scientific and Technical Publishers，1996：1-35.(in Chinese)) " target="_blank">
[3]	冯卫星，徐明新. 铁路隧道新奥法施工新实践[J]. 岩石力学与工程学报，2001，20(4)：524-526.(FENG Weixing，XU Mingxin. New practice in railway tunnel NATM construction[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(4)：524-526.(in Chinese))
[4]	朱维申，何满朝. 复杂条件下围岩稳定性与岩体动态施工力学[M]. 北京：科学出版社，1996：82-105.(ZHU Weishen，HE Manchao. Stability of rock caverns in complex condition and mechanics of rock dynamic construction[M]. Beijing：Science Press，1996：82-105.(in Chinese)) " target="_blank">
[6]	SWOBODA G，MERTZ W，SCHMID A. Three-dimensional numerical model to simulate tunnel excavation[C]// Proceedings of the 3rd International Conference on Numerical Models in Geomechanics. Niagara Falls，USA：[s. n.]，1989：536-548. " target="_blank">
[7]	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)：20-33.(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)：20-33.(in Chinese)) " target="_blank">
[9]	GALLI G，GRIMALDI A，LEONARDI A. Three-dimensional modeling of tunnel excavation and lining[J]. Computers and Geotechnics，2004，31(3)：171-183.
[10]	金丰年，钱七虎. 隧洞开挖的三维有限元计算[J]. 岩石力学与工程学报，1996，15(3)：193-200.(JIN Fengnian，QIAN Qihu. Simulation of three-dimensional tunnel excavations[J]. Chinese Journal of Rock Mechanics and Engineering，1996，15(3)：193-200.(in Chinese))
[11]	佘健，何川. 软弱围岩段隧道施工过程中围岩位移的三维弹塑性数值模拟[J]. 岩石力学与工程学报，2006，25(3)：623-629.(SHE Jian，HE Chuan. 3D elastoplastic numerical simulation of surrounding rock displacement in soft surrounding rock section during construction process[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(3)：623-629.(in Chinese))
[13]	李术才，刘钦，李利平，等. 隧道施工过程大比尺模型试验系统的研制及应用[J]. 岩石力学与工程学报，2011，30(7)：1 368-1 374. (LI Shucai，LIU Qin，LI Liping，et al. Development of large-scale geomechanical model test system for tunnel construction and its application[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(7)：1 368-1 374.(in Chinese)) " target="_blank">
[14]	侯公羽. 围岩-支护作用机制评述及其流变变形机制概念模型的建立与分析[J]. 岩石力学与工程学报，2011，27(增)：3 618-3 629. (HOU Gongyu. Review of interaction mechanism between surrounding rock and support and analysis of conceptual model of rheological deformation mechanism[J]. Chinese Journal of Rock Mechanics and Engineering，2011，27(Supp.)：3 618-3 629.(in Chinese)) " target="_blank">
[16]	赵星光，蔡美峰，蔡明，等. 地下工程岩体剪胀与锚杆支护的相互影响[J]. 岩石力学与工程学报，2010，29(2)：2 056-2 062.(ZHAO Xingguang，CAI Meifeng，CAI Ming，et al. Mutual influence between shear dilatation of rock mass and rebar support around underground excavation[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(2)：2 056-2 062.(in Chinese)) " target="_blank">