三轴压缩条件下共面双裂隙复合类岩断裂机制

PDF(7372 KB)

振动与冲击 ›› 2024, Vol. 43 ›› Issue (21) : 263-276.

论文

三轴压缩条件下共面双裂隙复合类岩断裂机制

司余洁1，肖桃李1，袁浩2，折海成1，赵云峰1

作者信息 +

Fracture mechanism of coplanar double-fracture composite rock under triaxial compression condition

SI Yujie1, XIAO Taoli1, YUAN Hao2, ZHE Haicheng1, ZHAO Yunfeng1

Author information +

文章历史 +

摘要

为了研究裂隙构型属性和围压对复合岩的破坏特性影响及裂隙在复合岩中的扩展规律，基于室内单轴和三轴压缩试验，采用PFC2D数值模拟软件建立含共面双裂隙复合岩三轴压缩颗粒模型，研究裂隙复合岩在不同裂隙倾角、裂隙长度和围压下的破坏特性和声发射演化规律。结果表明：岩样的破坏模式主要受裂隙倾角控制，而岩样的完整性主要受裂隙长度和围压控制。随着裂隙倾角的增加，岩样的破坏模式呈现张拉破坏→剪切破坏→拉-剪复合破坏的变化规律，随着裂隙长度和围压的增大，岩样的宏观裂纹减少，完整性越好；岩桥的贯通模式主要受裂隙倾角、结构面和围压的影响，裂隙倾角和围压越大，岩桥越容易贯通，结构面的存在会抑制岩桥的贯通；裂隙倾角越大，微裂纹呈“弥散式”分布于岩样的现象越明显，裂隙长度和围压越大，微裂纹的聚集现象越明显，岩样微裂纹的损伤积累随裂隙倾角和长度的增大而减小，随围压的增大而增大；岩样在变形加载过程中，声发射计数整体随裂隙倾角的增大而增大，随裂隙长度和围压的增大而减小，裂隙倾角、长度和围压主要改变的是声发射计数的数值大小。

Abstract

In order to study the effects of fracture configuration properties and confining pressure on the failure characteristics of composite rock and the law of fracture expansion in composite rock, based on indoor uniaxial and triaxial compression tests, a triaxial compression particle model of composite rock with coplanar double fractures was established by using PFC2D numerical simulation software, and the failure characteristics and acoustic emission evolution law of composite rock under different fracture inclination, length and confining pressure were studied. The results show that the failure mode of rock samples is mainly controlled by fracture inclination, while the integrity of rock samples is mainly controlled by fracture length and confining pressure. With the increase of crack inclination Angle, the failure mode of rock sample presents the change law of tensile failure → shear failure → tensile-shear combined failure. With the increase of crack length and confining pressure, the fewer macroscopic cracks of rock sample, the better the integrity. The larger the crack inclination is, the more obvious the distribution of micro-cracks in rock samples is. The larger the crack length and confining pressure are, the more obvious the accumulation of micro-cracks is. The damage accumulation of micro-cracks decreases with the increase of crack inclination and length and increases with the increase of confining pressure. The penetration mode of rock bridge is mainly affected by fracture inclination Angle, structural plane and confining pressure. The larger the fracture inclination Angle and confining pressure, the easier the rock bridge is to penetrate. In the process of deformation loading, the overall AE count increases with the increase of crack Angle but decreases with the increase of crack length and confining pressure. The main change of AE count is the value of crack Angle, length and confining pressure.

导出引用

司余洁1, 肖桃李1, 袁浩2, 折海成1, 赵云峰1. 三轴压缩条件下共面双裂隙复合类岩断裂机制[J]. 振动与冲击, 2024, 43(21): 263-276

SI Yujie1, XIAO Taoli1, YUAN Hao2, ZHE Haicheng1, ZHAO Yunfeng1. Fracture mechanism of coplanar double-fracture composite rock under triaxial compression condition[J]. Journal of Vibration and Shock, 2024, 43(21): 263-276

参考文献

[1] Cheng J L, Yang S Q, Chen K, et al. Uniaxial experimental study of the acoustic emission and deformation behavior of composite rock based on 3D digital image correlation (DIC)[J]. Acta Mechanica Sinica, 2017, 33(6): 999-1021.
[2] 许可, 肖桃李, 赵云峰, 等. 不同围压下裂隙位置对复合岩样力学特性的影响[J]. 矿业研究与开发, 2023, 43(1).
XU Ke, XIAO Taoli，ZHAO Yunfeng, et.al. Influence of fracture position on mechanical properties of composite rock samples under different confining pressures[J]. Mining Research and Development, 2023, 43(1): 67-75.
[3] 孙家军, 肖桃李, 折海成, 等. 围压作用下不同裂隙位置复合岩裂纹演化研究[J]. 水利水电技术(中英文), 2023(9).
SUN Jiajun, XIAO Taoli, SHE Haicheng, et al. Study on the fracture evolution of composite rocks with different fracture locations under the action of surrounding pressure[J]. Water Resources and Hydropower Engineering, 2023,54(09):190-200.
[4] Bozzano F, Lenti L, Martino S, et al. Earthquake triggering of landslides in highly jointed rock masses: Reconstruction of the 1783 Scilla rock avalanche (Italy)[J]. Geomorphology, 2011, 129(3): 294-308.
[5] Liu Z, Dong S, Wang H, et al. Mechanism and Control of Grout Propagation in Horizontal Holes in Fractured Rock[J]. Water, 2022, 14: 4062.
[6] Kilburn C. Precursory deformation and fracture before brittle rock failure and potential application to volcanic unrest[J]. Journal of Geophysical Research: Solid Earth, 2012.
[7] 肖桃李, 袁浩, 折海成, 等. 单轴压缩条件下类大理岩裂纹起裂特性与扩展规律[J]. 水利水电技术(中英文), 2022(8).
XIAO Taoli, YUAN Hao, SHE Haicheng, et al. Crack initiation characteristics and propagation law of marble-like rock under uniaxial compression[J]. Water Resources and Hydropower Engineering, 2022, 53(8): 161-171.
[8] 王春萍, 王璐, 刘建锋, 等. 单轴压缩条件下单裂隙花岗岩力学特性及破坏特征[J]. 西南交通大学学报, 2023, 59: 1-9.
WANG Chunping, WANG Lu, LIU Jianfeng, et al. Investigations on the mechanical behavior and failure mechanism of single fractured granite under uniaxial compression[J]. Journal of Southwest JiaoTong University:1-9.
[9] 章德超, 肖桃李, 折海成. 共面双裂隙对砂岩力学性质和破坏特征的影响[J]. 水电能源科学, 2023, 41(1).
ZHANG Dechao, XIAO Taoli, SHE Haicheng. Effect of coplanar double fissures on mechanical properties and failure characteristics of sandstone[J]. Water Resources and Power, 2023, 41(1): 151-154+111.
[10] 肖桃李, 李新平, 郭运华. 三轴压缩条件下单裂隙岩石的破坏特性研究[J]. 岩土力学, 2012, 33(11).
XIAO Taoli, LI Xinping, GUO Yunhua. Experimental study of failure characteristic of single jointed rock mass under triaxial compression tests[J]. Rock and Soil Mechanics, 2012, 33(11): 3251-3256.
[11] 段东,赵钰铤,张睿哲,等.基于显微CT的泥岩单轴压缩破坏特征的声发射表征[J].振动与冲击,2020,39(16):163-170+195.
DUAN Dong, ZHAO Yuting, ZHANG Ruizhe, et ai. Acoustic emission characterization of uniaxial compression failure characteristics of mudstone based on Micro-CT[J]. Journal of vibration and shock, 2020, 39(16): 163-170+195.
[12] Zhou X P, Cheng H, Feng Y F. An Experimental Study of Crack Coalescence behavior in Rock-Like Materials Containing Multiple Flaws Under Uniaxial Compression[J]. Rock Mechanics and Rock Engineering, 2014, 47(6): 1961-1986.
[13] Zhou X P, Lian Y J, Wong L N Y, et al. Understanding the fracture behavior of brittle and ductile multi-flawed rocks by uniaxial loading by digital image correlation[J]. Engineering Fracture Mechanics, 2018, 199: 438-460.
[14] Liu T, Cui M, Li Q, et al. Fracture and Damage Evolution of Multiple-Fractured Rock-like Material Subjected to Compression[J]. Materials, 2022, 15: 4326.
[15] 苗胜军,段懿轩,尹紫微,等.不同应力路径下辉绿岩能量演化与破坏机制研究[J].振动与冲击,2023,42(14):154-161.
MIAO Shengjun，DUAN Yixuan，YIN Ziwei, et al. Energy evolution and failure mechanism of diabase under different stress paths[J]. Journal of vibration and shock, 2023, 42(14): 154-161.
[16] Zhao Y, Zhang L, Asce F, et al. Experimental Study of Fracture Toughness and Subcritical Crack Growth of Three Rocks under Different Environments[J]. International Journal of Geomechanics, 2020, 20.
[17] Zhao Y, Liu Q, Zhang C, et al. Coupled seepage-damage effect in fractured rock masses: model development and a case study[J]. International Journal of Rock Mechanics and Mining Sciences, 2021, 144: 104822.
[18] Pakzad R, Wang S, Sloan S W. Three-dimensional finite element simulation of fracture propagation in rock specimens with pre-existing fissure(s) under compression and their strength analysis[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2020, 44(10): 1472-1494.
[19] Vásárhelyi B, Bobet A. Modeling of Crack Initiation, Propagation and Coalescence in Uniaxial Compression[J]. Rock Mechanics and Rock Engineering, 2000, 33(2): 119-139.
[20] 杜强, 王超, 赵光明等.考虑应变软化效应的裂隙岩体损伤本构模型的开发及应用[J]. 长江科学院院报, 2015, 32(11): 82-86+92.
DU Qiang, WANG Chao, ZHAO Guangming, et al. Development of Constitutive Model of Fractured Rock Mass Based on Strain Softening Effect and Its Application[J]. Journal of Changjiang River Scientific Research Institute, 2015, 32(11): 82-86+92.
[21] 张梅丽, 梁正召, 高敏, 等. 含交叉裂隙岩体力学性质数值模拟研究[J]. 地下空间与工程学报, 2020, 16(3): 758-769.
ZAHNG Meili, LIANG Zhengzhao, GAO Min, et al. Numerical Simulation of Mechanical Properties of Rock Specimens with Cross-crack under Different Confining Pressure[J]. Chinese Journal of Underground Space and Engineering, 2020, 16(3): 758-769.
[22] 刘相如. 断续裂隙岩石常规三轴压缩力学行为及破坏机理研究[D]. 中国矿业大学, 2021.
LIU Xiangru. Compression Mechanism of Fissured Rock under Triaxial Study on the Mechanical Behavior and Failure[D]. China University of Mining and Technology, 2021.
[23] Lee H, Jeon S. An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression[J]. International Journal of Solids and Structures, 2011, 48(6): 979-999.
[24] Fan X, Kulatilake P H S W, Chen X. Mechanical behavior of rock-like jointed blocks with multi-non-persistent joints under uniaxial loading: A particle mechanics approach[J]. Engineering Geology, 2015, 190: 17-32.
[25] Min K B, Jing L. Numerical determination of the equivalent elastic compliance tensor for fractured rock masses using the distinct element method[J]. International Journal of Rock Mechanics and Mining Sciences, 2003, 40(6): 795-816.
[26] 李新平, 肖桃李, 汪斌, 等. 锦屏二级水电站大理岩不同应力路径下加卸载试验研究[J]. 岩石力学与工程学报, 2012, 31(5).
LI Xinping，XIAO Taoli，WANG Bin，et al. Experimental study of jinping ii hydropower station marble under loading and unloading stress paths[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(5): 882-889.
[27] 肖桃李, 李新平, 贾善坡. 深部单裂隙岩体结构面效应的三轴试验研究与力学分析[J]. 岩石力学与工程学报, 2012, 31(8).
XIAO Taoli1，LI Xinping，JIA Shanpo, Triaxial test research and mechanical analysis based on structure surface effect of deep rock mass with single fissure[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(8): 1666-1673.
[28] Yuan H, Xiao T L, She H C, et al. Crack propagation law of rock with single fissure based on PFC2D[J]. Frontiers in Earth Science, 2023, 10: 977054.
[29] Yuan H, Xiao T L, She H C, et al. Mechanical properties and failure law of composite rock containing two coplanar fractures[J]. Frontiers in Earth Science, 2023, 10: 1007439.
[30] 郝保钦, 张昌锁, 王晨龙, 等. 岩石PFC~(2D)模型细观参数确定方法研究[J]. 煤炭科学技术, 2022, 50(4): 132-141.
HAO Baoqin, ZHANG Changsuo, WANG Chenglong, et al. Study on determination micro-parameters of rock PFC2D model[J]. coal Science and Technology, 2022, 50(4): 132-141.
[31] Huang Y H, Yang S Q, Zeng W. Experimental and numerical study on loading rate effects of rock-like material specimens containing two unparallel fissures[J]. Journal of Central South University, 2016, 23(6): 1474-1485.
[32] Potyondy D O. A flat-jointed bonded-particle material for hard rock[C]//Proceedings of the 46textsuperscriptth U.S. Rock Mechanics / Geomechanics Symposium. 2012.
[33] 陈鹏宇,孔莹,余宏明.岩石单轴压缩PFC2D模型细观参数标定研究[J].地下空间与工程学报, 2018, 14(5):10.
CHEN Pengyu, KONG Ying, YU Hongming. Research on the Calibration Method of Microparameters of a Uniaxial Compression PFC2D Model for Rock[J]. Chinese Journal of Underground Space and Engineering, 2018, 14(5):10.
[34] Martin C D, Chandler N A. The progressive fracture of Lac du Bonnet granite[J]. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1994, 31(6): 643-659.
[35] Nicksiar M, Martin C D. Evaluation of Methods for Determining Crack Initiation in Compression Tests on Low-Porosity Rocks[J]. Rock Mechanics and Rock Engineering, 2012, 45(4): 607-617.
[36] ERDOGAN F, SIH G C. On the crack extension in plates under plane loading and transverse shear[J]. Journal of Basic Engineering, 1963, 85(4): 519-525.