重复剪切作用下节理强度和形貌特征劣化规律

邓华锋; 肖瑶; 李建林; 段玲玲; 支永艳; 潘登

doi:10.11779/CJGE2018S2037

重复剪切作用下节理强度和形貌特征劣化规律 English Version

三峡库区地质灾害教育部重点实验室（三峡大学）,湖北宜昌 443002

基金项目: 湖北省自然科学基金重点项目（2015CFA140）; 国家自然科学基金项目（51679127）; 国家自然科学基金重点项目（51439003）; 三峡大学2015级硕士学位论文培优基金项目（2017YPY016）

详细信息

作者简介:
邓华锋(1979- ),男,博士,教授,主要从岩土工程方面的教学与研究工作。E-mail：dhf8010@ctgu.edu.cn。

中图分类号: TU452
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出版历程
- 收稿日期: 2018-07-21
- 发布日期: 2018-10-29

Degradation laws of joint strength and micro-morphology under repeated shear tests

Key Laboratory of Geological Hazards on Three Gorges Reservoir Area (China Three Gorges University), Ministry of Education, Yichang 443002, China

摘要

摘要: 为了分析重复剪切作用下节理面剪切力学特性及微观形貌特征劣化规律,制备了单节理砂岩试样,考虑4种法向应力分别进行了6次重复剪切试验。研究结果发现：①在重复剪切作用下,节理面剪应力-剪切变形曲线变化特征明显,经过2~3次剪切,不再出现明显峰值,剪切硬化现象明显,残余抗剪强度逐渐趋于稳定;②随着重复剪切次数增加,节理面的抗剪强度劣化趋势明显,呈先陡后缓的劣化趋势,前2次剪切的劣化幅度占总劣化值的65%以上,而且法向应力越大,抗剪强度劣化幅度和劣化速度越大;③在重复剪切作用下,节理面上相互咬合的微凸起和凹陷部分发生切齿、磨损和填充,节理面的凹凸起伏程度逐渐减小,使得其形貌特征参数及粗糙度系数逐渐降低,进而导致其剪切力学特性逐渐劣化;④建立了重复剪切作用下节理面粗糙度系数劣化方程,结合N.Barton提出的结构面抗剪强度经验公式,建立了考虑重复剪切作用的节理面抗剪强度计算公式,结果表明计算值与试验值吻合的较好。
- 岩石力学 /
- 节理 /
- 重复剪切 /
- 微观形貌 /
- 粗糙度系数 /
- 劣化规律
Abstract: In order to analyze the degradation laws of shear mechanics properties and micro-morphology of joint planes under repeated shear tests, single joint sandstone specimens are prepared and six times of repeated shear tests are carried out respectively considering four kinds of normal stresses. The results show that: (1) During the repeated shearing process, the shear stress-shear deformation curve changes obviously. After 2 or 3 times of shear tests, there is no obvious peak shear strength and the shear hardening phenomenon is obvious, and the residual shear strength is gradually stabilized. (2) With the increase times of repeated shearing, the shear strength of the joint planes are deteriorated obviously. The deterioration trend is fast in the first place and then become slow. The degradation rate of the first two times of shear tests is more than 65% of the total deterioration value. In addition, the greater the stress, the greater and fast the shear strength degradation rate. (3) Under the repeated shearing effect, the occlusive micro-embossment and depression begin to incise, wear and fill with each other on the joint plane, and the concavo-convex fluctuation of the joint plane gradually decreases, thus makes the morphological parameters and roughness coefficient gradually decrease, and then it leads to the gradual deterioration of shear mechanics properties. (4) The deterioration equation for roughness coefficient under repeated shearing is established. Combining with N. Barton's empirical formula for shear strength of structural planes, the formula for calculating the shear strength considering the repeated shearing effect is established. The results show that the calculated values agree well with the experimental ones.
- rock mechanics /
- joint /
- repeated shear /
- micro-morphology /
- roughness coefficient /
- deterioration law

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参考文献(19)

[1]	沈明荣, 陈建峰. 岩体力学[M]. 2版. 上海: 同济大学出版社, 2015: 66-83. (SHEN Ming-rong, CHEN Jian-feng.Rock mass mechanics[M]. 2nd ed. Shanghai: Tongji University Press, 2015: 66-83. (in Chinese))
[2]	杨洁, 荣冠, 程龙, 等. 节理峰值抗剪强度试验研究[J]. 岩石力学与工程学报, 2015, 34(5): 884-894. (YANG Jie, RONG Guan, CHENG Long, et al.Experimental study of peak shear strength of rock joints[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(5): 884-894. (in Chinese))
[3]	KWON T H, HONG E S, CHO G C.Shear behavior of rectangular-shaped asperities in rock joints[J]. KSCE Journal of Civil Engineering, 2010, 14(3): 323-332.
[4]	黄曼, 杜时贵, 罗战友, 等. 基于多尺度直剪试验的岩石模型结构面抗剪强度特征研究[J]. 岩土力学, 2013, 34(11): 3180-3186. (HUANG Man, DU Shi-gui, LUO Zhan-you, et al.Study of shear strength characteristics of simulation rock structural planes based on multi-size direct shear tests[J]. Rock and Soil Mechanics, 2013, 34(11): 3180-3186. (in Chinese))
[5]	唐志成, 王晓川. 不同接触状态岩石节理的剪切力学性质试验研究[J]. 岩土工程学报, 2017, 39(12): 2312-2319. (TANG Zhi-cheng, WANG Xiao-chuan.Experimental studies on the mechanical behavior of rock joints with varying matching degrees[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(12): 2312-2319. (in Chinese))
[6]	杨志全, 张震, 侯克鹏, 等. 开挖与卸载交替作用对上陡下缓型高陡层状岩质边坡变形失稳影响试验研究[J]. 四川大学学报(工程科学版), 2016, 48(6): 8-15. (YANG Zhi-quan, ZHANG Zhen, HOU Ke-peng, et al.Experiment of alternating actions of excavation and unload high and steep bedding rock slopes with upper effects on deformation and instability of steep and lower gentle style[J]. Journal of Sichuan University (Engineering Science Edition), 2016, 48(6): 8-15. (in Chinese))
[7]	黄润秋. 岩石高边坡发育的动力过程及其稳定性控制[J]. 岩石力学与工程学报, 2008, 27(8): 1525-1544. (HUANG Run-qiu.Geodynamical process and stability control of high rock slope development[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(8): 1525-1544. (in Chinese))
[8]	夏才初, 宋英龙, 唐志成, 等. 反复直剪试验节理强度与粗糙度变化的研究[J].中南大学学报(自然科学版), 2012, 43(9): 3589-3594. (XIA Cai-chu, SONG Ying-long, TANG Zhi-cheng, et al.Shear strength and morphology characteristic evolution of joint surface under cyclic loads[J]. Journal of Central South University (Science and Technology), 2012, 43(9): 3589-3594. (in Chinese))
[9]	BELEM T, HOMAND-ETIENNE F, SOULEY M.Quantitative parameters for rock joint surface roughness[J]. Rock Mechanics and Rock Engineering, 2000, 33(4): 217-242.
[10]	JAFARIA M K, AMINI HOSSEINIA K, PELLET F, et al.Evaluation of shear strength of rock joints subjected to cyclic loading[J]. Soil Dynamics and Earthquake Engineering, 2003, 23: 619-630.
[11]	尹显俊, 王光纶, 张楚汉. 岩体结构面切向循环加载本构关系研究[J]. 工程力学, 2005, 22(6): 97-103, 57.(YIN Xian-jun, WANG Guang-lun, ZHANG Chu-han. Study of constitutive model for rock interfaces and joints under cyclic shear loading[J]. Engineering Mechanics, 2005, 22(6): 97-103, 57. (in Chinese))
[12]	杜时贵, 胡晓飞, 郭霄, 等. JRC-JCS模型与直剪试验对比研究[J]. 岩石力学与工程学报, 2008, 27(增刊1): 2747-2753. (DU Shi-gui, HU Xiao-fei, GUO Xiao, et al.Comparison study of JRC-JCS model and direct shear test[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(S1): 2747-2753. (in Chinese))
[13]	陈世江, 朱万成, 于庆磊, 等. 基于多重分形特征的岩体结构面剪切强度研究[J]. 岩土力学, 2015, 36(3): 703-710, 718.(CHEN Shi-jiang, ZHU Wan-cheng, YU Qing-lei, et al. Shear strength research on rock joint surfaces based on multifractal theory[J]. Rock and Soil Mechanics, 2015, 36(3): 703-710, 718. (in Chinese))
[14]	孙辅庭, 佘成学, 万利台, 等. 基于三维形貌特征的岩石节理峰值剪切强度准则研究[J]. 岩土工程学报, 2014, 36(3): 529-5368. (SUN Fu-ting, SHE Cheng-xue, WAN Li-tai, et al.Peak shear strength criterion for rock joints based on three-dimensional morphology characteristics[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(3): 529-5368. (in Chinese))
[15]	游志诚, 王亮清, 杨艳霞, 等. 基于三维激光扫描技术的结构面抗剪强度参数各向异性研究[J]. 岩石力学与工程学报, 2014, 33(增刊1): 3003-3008. (YOU Zhi-cheng, WANG Liang-qing, YANG Yan-xia, et al.Anisotropic research on shear strength parameters of discontinuity based on three-dimensional laser scanning technology[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(S1): 3003-3008. (in Chinese))
[16]	GRASSELLI G.Manuel rocha medal recipient shear strength of rock joints based on quantified surface description[J]. Rock Mechanics and Mining Sciences. 2006, 39(4): 295-314.
[17]	PATTON F D.Multiple modes of shear failure in rock[C]// Proceedings of the 1st ISRM Congress. Lisbon, 1966: 509-513.
[18]	陈瑜, 曹平, 蒲成志, 等. 水-岩作用对岩石表面微观形貌影响的试验研究[J]. 岩土力学, 2010, 31(11): 3452-3458. (CHEN Yu, CAO Ping, PU Cheng-zhi, et al.Experimental study of effect of water-rock interaction on micro-topography of rock surface[J]. Rock and Soil Mechanics, 2010, 31(11): 3452-3458. (in Chinese))
[19]	YANG Z Y, LO S C, DI C C.Reassessing the joint roughness coefficient (JRC) estimation using Z2[J]. Rock Mechanics and Rock Engineering, 2001, 24(3): 243-251.