断续节理岩体强度与破坏特征的数值模拟研究

梁正召; 肖东坤; 李聪聪; 吴宪锴; 龚斌

doi:10.11779/CJGE201411015

断续节理岩体强度与破坏特征的数值模拟研究 English Version

1. 大连理工大学土木工程学院,辽宁大连 116024;
2. 武汉大学岩土与结构工程安全湖北省重点试验室,湖北武汉 430072

基金项目: 国家重点基础研究发展计划（973计划）项目（2014CB047100,2011CB013500）; 国家自然科学基金项目（51274053）; 湖北省岩土与结构工程安全湖北省重点实验室开放基金项目

详细信息

作者简介:
梁正召(1977-),男,教授,主要从事岩石破坏机制及其数值模拟研究工作。E-mail:liangzz@dlut.edu.cn。

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出版历程
- 收稿日期: 2014-03-03
- 发布日期: 2014-11-19

Numerical study on strength and failure modes of rock mass with discontinuous joints

1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, China;
2 Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, Wuhan University, Wuhan 430072, China

摘要

摘要: 基于细观统计损伤数值模型,通过改变包含单组节理岩体的节理倾角、节理台阶角、层距d和岩桥长度l_r,建立不同节理分布的断续节理岩体数值试样,展开系列数值试验,模拟了节理岩体的破坏过程,探讨了节理结构几何参数和应力水平对破坏模式以及岩体力学参数的影响规律。研究结果表明,断续节理岩体破坏模式共分为4种：沿节理面破坏、转动块体破坏、台阶状破坏和混合破坏。沿节理面破坏与台阶状破坏的岩体峰值强度高、破坏应变大,转动破坏的岩体峰值强度低、破坏应变小。随着节理倾角的增大,岩体力学行为表现出脆性破坏—渐进破坏—脆性破坏的循环过程。随着应力水平的增加,岩体破坏区域由中间向端部扩展,并且对于强度的提高有显著作用,但提高水平随围压增加而降低。节理台阶角对于=90°时的破坏形式影响较大,由台阶状破坏转变为转动块体破坏,层距d对阶梯状破坏模式影响较小,对转动破坏模式影响较大,岩桥长度l_r不影响破坏模式,但对面破坏与台阶状破坏模式的峰值强度、破坏应变影响较大。通过对比,模拟结果与物理试验规律一致,但数值模拟结果可以清晰获得节理岩体中应力场分布、裂纹起裂点与扩展方向、破坏图像等,有利于分析其内在破坏规律与机理。
- 破坏模式 /
- 节理倾角 /
- 节理台阶角 /
- 层距 /
- 岩桥长度
Abstract: Based on a microscopic statistical damage model, different failure criteria are introduced into a numerical code to simulate tensile breaking and compression shear failure of jointed rock subjected to uniaxial compression and biaxial compression. Influences of geometrical parameters of the joints and lateral stress on fracture patterns and mechanical behaviors are investigated. The results show that the whole failure modes consist of four types: planar failure, stepped failure, rotating-block failure and mixed failure. The planar failure and stepped failure are associated with high strengths and strains, whereas the rotational failure is associated with low strengths and strains. As the joint inclination increases, the peak strength and elastic modulus increase and then decrease. As the lateral stress increases, the failure areas expand from the middle to both ends and appreciably improve the strength, but the increasing level will reduce when the lateral stress continues to increase. The step angle of joints has great influence on the failure modes when =90°, and the failure mode changes from stepped failure to the rotational failure. The layer distance d has slight influence on the stepped failure and great influence on the rotational failure. The rock bridge length l_r does not affect the transition of the failure mode, but it affects the peak strength and failure strain of both the planar failure and stepper failure. The results may provide guidance and reference to jointed rock engineering.
- failure mode /
- joint orientation /
- joint step angle /
- layer distance /
- rock bridge length

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参考文献(15)

[1]	李宁, SWOBODA G. 当前岩石力学数值方法的几点思考[J]. 岩石力学与工程学报, 1997, 16(5): 502-505. (LI Ning, SWOBODA G. Discussion on the application of numerical methods to rock mechanics and engineering[J]. Chinese Journal of Rock Mechanics and Rock Engineering, 1997, 16(5): 502-505. (in Chinese))
[2]	JAEGER J, COOK N. Fundamentals of rock mechanics[M]. London: Chapman and Hall LTD, 1969: 53-108.
[3]	RAMAMURTHY T, ARORA V. Strength predictions for jointed rocks in confined and unconfined states[J]. Int J Rock Mech Min Sci & Geomech Abstr, 1994, 31(1): 9-22.
[4]	LAJTAI E Z. Brittle fracture in compression[J]. International Journal of Fracture, 1974, 10(4): 525-536.
[5]	TIWARI R P. Point failure behavior of a rock mass under the influence of triaxial and true triaxial confinement[J]. Engineering Geology, 2006, 84(3/4): 112-129.
[6]	GERMANOVICH L N, SALGANIK R L, DYSKIN A V, et al. Mechanisms of brittle fracture of rocks with multiple pre-existing cracks in compression[J]. Pure Appl Geophys, 1994, 143(1/2/3): 117-149.
[7]	LIN P, ROBINA H C, WONG K T, et al. Multi-crack coalescence in rock-like material under uniaxial and biaxial loading[J]. Key Engineering Materials, 2000, 183(1): 809-814.
[8]	SAGONG M, BOBET A. Coalescence of multiple flaws in a rock-model material in uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences, 2002, 39(2): 229-241.
[9]	PRUDENCIO M, VAN SINT JAN M. Strength and failure modes of rock mass models with non-persistent joints[J]. International Journal of Rock Mechanics and Mining Sciences, 2007, 44(6): 890-902.
[10]	张志刚, 乔春生, 李晓. 单节理岩体强度试验研究[J]. 中国铁道科学, 2007, 28(4): 34-39. (ZHANG Zhi-gang, QIAO Chun-sheng, LI Xiao. Experimental study on the strength of single joint rock mass[J]. China Railway Science, 2007, 28(4): 34-39. (in Chinese))
[11]	蒲成志, 曹平, 赵延林, 等. 单轴压缩下多裂隙类岩石材料强度试验与数值分析[J]. 岩土力学, 2010, 31(11): 3661-3666. (PU Cheng-zhi, CAO Ping, ZHAO Yan-lin, et al. Numerical analysis and strength experiment of rock-like materials with multi-fissures under uniaxial compression[J]. Rock and Soil Mechanics, 2010, 31(11): 3661-3666. (in Chinese))
[12]	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 Zhi-hong, LI De-jian. 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))
[13]	汤明高, 许强, 黄润秋, 等. 小湾水电工程6#山梁节理岩体高边坡3DEC分析[J]. 水文地质工程地质, 2006(3): 57-60. (TANG Ming-gao, XU Qiang, HUANG Run-qiu. 3DEC analysis on 6# high rock slope with joints in Xiaowan Hydropower Projec[J]. Hydrogeology & Engineering Geology, 2006(3): 57-60. (in Chinese))
[14]	朱道建, 杨林德, 蔡永昌. 柱状节理岩体压缩破坏过程模拟及机制分析[J]. 岩石力学与工程学报, 2009, 28(4): 716-724. (ZHU Dao-jian, YANG De-lin, CAI Yong-chang. Simulation of compressive failure process of columnar jointed rock mass and its failure mechanism analysis[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(4): 716-724. (in Chinese))
[15]	唐春安, 王述红, 傅宇方. 岩石破裂过程数值试验[M]. 北京: 科学出版社, 2003. (TANG Chun-an, WANG Shu-hong, FU Yu-fang. Numerical tests of rock failure process[M]. Beijing: Science Press, 2003. (in Chinese))

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断续节理岩体强度与破坏特征的数值模拟研究 English Version

作者简介: 梁正召(1977-),男,教授,主要从事岩石破坏机制及其数值模拟研究工作。E-mail:liangzz@dlut.edu.cn。

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Numerical study on strength and failure modes of rock mass with discontinuous joints

期刊类型引用(2)

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出版历程

目录

作者简介:
梁正召(1977-),男,教授,主要从事岩石破坏机制及其数值模拟研究工作。E-mail:liangzz@dlut.edu.cn。