节理岩体卸荷各向异性力学特性试验研究

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摘要针对节理岩体开挖卸荷所产生的各向异性力学难题，通过制作不同倾角单一预制节理试件，开展节理岩体三轴卸荷试验，研究卸荷条件下节理岩体的应力–应变关系、变形特征、强度特征和破坏模式。得到如下结论：(1) 进入卸荷阶段之后，0°，30°和90°倾角节理试件的应力–应变曲线依次出现屈服、软化和残余变形阶段，而45°和60°倾角节理试件只出现屈服阶段。(2) 节理试件的变形模量随节理倾角呈U型变化，其中，60°倾角节理试件的变形模量最小；随着围压升高，不同倾角节理试件之间的变形特性差异逐渐减小。(3) 0°，30°和90°倾角节理试件的抗压强度降低，而45°和60°倾角节理试件几乎未降低；节理试件的黏聚力随节理倾角呈U型变化，其中，60°倾角节理试件仍为最小；而内摩擦角随节理倾角增大而增大。(4) 0°，30°和90°倾角节理试件的破坏模式均为穿越节理的压剪破坏，且不受节理影响，而45°和60°倾角节理试件的破坏模式均为沿节理面滑动破坏。(5) 揭示节理岩体的卸荷力学特性分为受岩块强度控制和节理面强度控制。

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关键词 ：岩石力学, 节理岩体, 卸荷试验, 各向异性, 力学特性

Abstract：The triaxial unloading tests on the precasted rock samples of a single joint with different dip angles were conducted to investigate the anisotropic mechanical behaviour of jointed rock masses under excavation including the stress-strain curves，the deformation and strength characteristics and the failure modes. (1) The stress-strain curves of jointed samples with dip angles of 0°，30° and 90° had a yield phase，a softening phase and a residual phase upon unloading，while the samples with dip angles of 45° and 60°had a yield phase only. (2) The variation of the deformation moduli versus the angles of joint inclination is in U-shape and the deformation modulus of the sample with the dip angle of 60°is the smallest. The differences of the deformation characteristics of different samples decreased gradually with the increasing of the confining pressure. (3) The compressive strengths of the samples with dip angles of 0°，30°and 90°were reduced，and those of the samples with dip angles of 45°and 60°were changed little. The cohesion versus the angle of joint inclination is in U-shape. The cohesion of the sample with the dip angle of 60°is also the smallest. The internal angle of friction increased with increase of the angle of joint inclination. (4) The failure modes of the samples with dip angles of 0°，30°and 90° were all shear failure across the joint surface and were not effected by the joint. The samples with dip angles of 45°and 60° were sliding failure along the joint surface. (5) It was revealed that the unloading mechanical characteristics of the jointed rock masses were controlled by the strengths of both rocks and joint surfaces.

Key words： rock mechanics jointed rock masses unloading test anisotropy mechanical characteristics

收稿日期: 2013-07-22

引用本文:

李建林1，王乐华1，孙旭曙2. 节理岩体卸荷各向异性力学特性试验研究[J]. 岩石力学与工程学报, 2014, 33(05): 892-900.
LI Jianlin1，WANG Lehua1，SUN Xushu2. EXPERIMENTAL STUDY ON ANISOTROPIC MECHANICAL CHARACTERISTICS OF JOINTED ROCK MASSES UNDER UNLOADING CONDITION. , 2014, 33(05): 892-900.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/I05/892

[5]	KULATILAKE P，MALAMA B，WANG J. Physical and particle flow modeling of jointed rock block behavior under uniaxial loading[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(5)：641-657. " target="_blank">
[6]	YOSHINAKA R，YAMABE T. Joint stiffness and the deformation behaviour of discontinuous rock[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1986，23(1)：19-28. " target="_blank">
[8]	BROWN E T. Strength of models of rock with intermittent joints[J]. Journal of Soil Mechanics and Foundations Division，1970，96(6)： 1 935-l 949. " target="_blank">
[10]	陈新，廖志红，李德建. 节理倾角及连通率对岩体强度、变形影响的单轴压缩试验研究[J]. 岩石力学与工程学报，2011，30(4)：781-789.(CHEN Xin，LIAO Zhihong，LI Dejian. Experimental study of effects of joint inclination angle and connectivity rate on strength and deformation properties of rock masses under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(4)：781-789.(in Chinese))
[2]	哈秋舲. 岩体工程与岩体力学仿真分析——各向异性开挖卸荷岩体力学研究[J]. 岩土工程学报，2001，23(6)：664-668.(HA Qiuling. Simulation analysis for rock mass engineering and rock mass mechanics—the study on anisotropic excavation unloading rock mass mechanics[J]. Chinese Journal of Geotechnical Engineering，2001，23(6)：664-668.(in Chinese))
[15]	李建林，孟庆义. 卸荷岩体的各向异性研究[J]. 岩石力学与工程学报，2001，20(3)：338-341.(LI Jianlin，MONG Qingyi. Anisotropic study of unloaded rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(3)：338-341.(in Chinese))
[3]	朱伯芳. 有限单元法原理与应用[M]. 北京：中国水利水电出版社，2009：479-480.(ZHU Bofang. The finite element method theory and applications[M]. Beijing：China Water Power Press，2009：479-480.(in Chinese)) " target="_blank">
[13]	张波，李术才，张敦福，等. 含充填节理岩体相似材料试件单轴压缩试验及断裂损伤研究[J]. 岩土力学，2012，33(6)：1 647-1 652. (ZHANG Bo，LI Shucai，ZHANG Dunfu，et al. Uniaxial compression mechanical property test，fracture and damage analysis of similar material of jointed rock mass with filled cracks[J]. Rock and Soil Mechanics，2012，33(6)：1 647-1 652.(in Chinese))
[19]	夏才初，李宏哲，刘胜. 含节理岩石试件的卸荷变形特性研究[J]. 岩石力学与工程学报，2010，29(4)：697-704.(XIA Caichu，LI Hongzhe，LIU Sheng. Study of deformation properties of jointed specimens under unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(4)：697-704.(in Chinese))
[7]	BROWN E T，TROLLOPE D H. Strength of a model of jointed rock[J]. Journal of Soil Mechanics and Foundations Division，1970，96(2)：685-704. " target="_blank">
[11]	陈新，王仕志，李磊. 节理岩体模型单轴压缩破碎规律研究[J]. 岩石力学与工程学报，2012，31(5)：898-907.(CHEN Xin，WANG Shizhi，LI Lei. Characteristics of fragments of jointed rock mass model under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(5)：898-907.(in Chinese))
[1]	哈秋舲，李建林，张永兴，等. 节理岩体卸荷非线性岩体力学[M]. 北京：中国建筑工业出版社，1998：19-24.(HA Qiuling，LI Jianlin，ZHANG Yongxing，et al. Nonlinear mechanics of jointed rock during unloading[M]. Beijing：China Architecture and Building Press，1998：19-24.(in Chinese)) " target="_blank">
[4]	WASANTHA P L P，RANJITH P G，VIETE D R，et al. Influence of the geometry of partially-spanning joints on the uniaxial compressive strength of rock[J]. International Journal of Rock Mechanics and Mining Sciences，2012，50：140-146. " target="_blank">
[9]	EINSTEIN H H，HIRSCHFELD R C. Model studies on mechanics of jointed rock[J]. Journal of Soil Mechanics and Foundations Division，1973，99(3)：229-248. " target="_blank">
[12]	CHEN X，LIAO Z H，PENG X. Deformability characteristics of jointed rock masses under uniaxial compression[J]. International Journal of Mining Science and Technology，2012，22(2)：213-221. " target="_blank">
[14]	哈秋舲. 三峡工程永久船闸陡高边坡各向异性卸荷岩体力学研究[J]. 岩石力学与工程学报，2001，20(5)：603-618.(HA Qiuling. Study on the anisotropic unloading rock mass mechanics for the steep-high rock slope of the three gorges project permanent shiplock[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(5)：603-618.(in Chinese))
[16]	李建林，王乐华. 节理岩体卸荷非线性力学特性研究[J]. 岩石力学与工程学报，2007，26(10)：1 968-1 975.(LI Jianlin，WANG Lehua. Study on unloading nonlinear mechanical characteristics of jointed rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(10)：1 968-1 975.(in Chinese)) " target="_blank">
[17]	王瑞红，李建林，蒋昱州，等. 含预制节理岩体卸荷条件下力学特性试验研究[J]. 岩土力学，2012，33(11)：3 257-3 262.(WANG Ruihong，LI Jianlin，JIANG Yuzhou，et al. Experimental research on mechanical property of rock mass with prefabricated joints under unloading condition[J]. Rock and Soil Mechanics，2012，33(11)：3 257-3 262.(in Chinese)) " target="_blank">
[18]	王在泉，张黎明，孙辉. 含天然节理灰岩加、卸荷力学特性试验研究[J]. 岩石力学与工程学报，2010，29(增1)：3 308-3 313. (WANG Zaiquan，ZHANG Liming，SUN Hui. Experimental research on mechanical properties of limestone containing natural joints under loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.1)：3 308-3 313.(in Chinese)) " target="_blank">
[20]	李建林. 卸荷岩体力学理论与应用[M]. 北京：中国建筑工业出版社，1999：45.(LI Jianlin. Theory and application of unloading rock mass[M]. Beijing：China Architecture and Building Press，1999：45.(in Chinese)) " target="_blank">