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| Uniaxial creep test and three-dimensional numerical simulation of double flawed sandstone with different rock bridge angles |
| YANG Chao，WANG Jiao，DONG Xingchen，WANG Lehua，WANG Ruihong |
| (Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，Ministry of Education，China Three Gorgers University，Yichang，Hubei 443002，China) |
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Abstract To analyse the influence of rock bridge angle on the strength and failure characteristics of rock mass under different stress paths，seven kinds of double flawed sandstone samples with different were prepared，then uniaxial compression tests，single and multi-stage creep tests were carried out. Results show that the rock bridge angle has significant effect on the critical stress，but the ratio of the critical stress of the same sample is less affected by . The long-term strength of the samples is very close to the crack initiation stress ，thus the long-term strength of the rock mass can be estimated only through the conventional compression test. In terms of crack propagation，the penetration characteristics of the same samples under the four loading paths are basically the same：the rock bridge is not penetrated when the samples with ????°–??°are damaged，while the samples with ???60°–90°show the mode of direct penetration failure of the rock bridge. It is shown that the influence of on the crack propagation is greater than that of the stress path. In addition，some samples also show the phenomenon that the apparent crack and the internal crack propagation are not consistent. In view of this，based on the continuous medium element simulation，a crack propagation judgment method based on plastic strain was proposed，and a three-dimensional model was established for calculation. The simulation results show that they are consistent with the test results. This method is more accurate than the traditional method of judging the crack propagation through the plastic zone，and can provide some reference for the three-dimensional time-dependent propagation simulation of rock fracture.
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[1] HUANG D，GU D，YANG C，et al. Investigation on mechanical behaviors of sandstone with two preexisting flaws under triaxial compression[J]. Rock Mechanics and Rock Engineering，2016，49(2)：375–399.
[2] HUANG D，ZHONG Z，GU D. Experimental investigation on the failure mechanism of a rock landslide controlled by a steep-gentle discontinuity pair[J]. Journal of Mountain Science，2019，16(6)：1 258–1 274.
[3] 陈国庆，赵 聪，刘 辉，等. 不同应力路径下岩桥试验的声发射特征研究[J]. 岩石力学与工程学报，2016，35(9)：1 792–1 804. (CHEN Guoqing，ZHAO Cong，LIU Hui，et al. Acoustic emission characteristics of rock bridge test under different stress paths[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(9)：1 792–1 804.(in Chinese))
[4] 陈国庆，刘 辉，秦昌安，等. 中部锁固岩桥三轴加卸荷力学特性及裂纹扩展研究[J]. 岩石力学与工程学报，2017，36(5)：1 162–1 173.(CHEN Guoqing，LIU Hui，QIN Chang?an，et al. Mechanical properties and crack model of central rock bridge in triaxial unloading test[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(5)：1 162–1 173.(in Chinese))
[5] 陈国庆，刘 顶，徐 鹏，等. 节理岩桥真三轴开挖卸荷试验研究[J]. 岩石力学与工程学报，2018，37(2)：325–338.(CHEN Guoqing，LIU Ding，XU Peng，et al. True-triaxial test on unloading failure of jointed rock bridge[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(2)：325–338.(in Chinese))
[6] 杨 超，冯振华，王 鑫，等. 多级时效荷载下双裂隙砂岩变形与破裂特征试验研究[J]. 岩石力学与工程学报，2017，36(9)：2 092–2 101.(YANG Chao，FENG Zhenhua，WANG Xin，et al. Experimental research on deformation and crack coalescence properties of sandstone containing two pre-existing fissures under multistage time-dependent loading[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(9)：2 092–2 101.(in Chinese))
[7] SHI G，YANG X，YU H，et al. Acoustic emission characteristics of creep fracture evolution in double-fracture fine sandstone under uniaxial compression[J]. Engineering Fracture Mechanics，2019，210：13–28.
[8] HUANG B L，DONG X C，YANG C，et al. Structural damage to carbonate pillar hazardous rock masses subject to long-term water-level fluctuations in the Three Gorges reservoir area，China[J]. Quarterly Journal of Engineering Geology and Hydrogeology，2022，55(2)：1–9.
[9] 岑夺丰，黄 达，黄润秋. 岩质边坡断续裂隙阶梯状滑移模式及稳定性计算[J]. 岩土工程学报，2014，36(4)：695–706.(CEN Duofeng，HUANG Da，HUANG Runqiu，et al. Step-path failure mode and stability calculation of jointed rock slopes[J]. Chinese Journal of Geotechnical Engineering，2014，36(4)：695–706.(in Chinese))
[10] LI X，KONIETZKY H. Numerical simulation schemes for time-dependent crack growth in hard brittle rock[J]. Acta Geotechnica，2015，10(4)：513–531.
[11] 高文华，刘 正，张志敏. 基于FLAC3D的粉砂岩压缩蠕变试验数值模拟研究[J]. 土木工程学报，2015，48(3)：96–102.(GAO Wenhua，LIU Zheng，ZHANG Zhimin. Numerical simulation study on compression creep experiment of siltstone based on FLAC3D[J]. China Civil Engineering Journal，2015，48(3)：96–102.(in Chinese))
[12] 陆银龙，王连国. 基于微裂纹演化的岩石蠕变损伤与破裂过程的数值模拟[J]. 煤炭学报，2015，40(6)：1 276–1 283.(LU Yinlong，WANG Lianguo. Numerical modeling of time-dependent damage and failure process of rocks based on micro-crack propagation[J]. Journal of China Coal Society，2015，40(6)：1 276–1 283.(in Chinese))
[13] CHEN W，KONIETZKY H. Simulation of heterogeneity，creep，damage and lifetime for loaded brittle rocks[J]. Tectonophysics，2014，633：164–175.
[14] GU D M，HUANG D，ZHANG W G，et al. A 2D DEM-based approach for modeling water-induced degradation of carbonate rock[J]. International Journal of Rock Mechanics and Mining Sciences，2020，126：104188.
[15] 周瑞鹤，程 桦，蔡海兵，等. 三轴压缩分级卸荷条件下粉砂岩蠕变特性及蠕变模型[J]. 岩石力学与工程学报，2022，41(6)：1 136–1 147.(ZHOU Ruihe，CHENG Hua，CAI Haibing，et al. Creep characteristics and creep model of siltstone under triaxial compression and graded unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(6)：1 136–1 147.(in Chinese))
[16] 栾茂田，武亚军，年廷凯. 强度折减有限元法中边坡失稳的塑性区判据及其应用[J]. 防灾减灾工程学报，2003，23(3)：1–8.(LUAN Maotian，WU Yajun，NIAN Tingkai. A criterion for evaluating slope stability based on development of plastic zone by shear strength reduction FEM[J]. Journal of Disaster Prevention and Mitigation Engineering，2003，23(3)：1–8.(in Chinese))
[17] 付金伟，朱维申，王向刚，等. 节理岩体裂隙扩展过程一种新改进的弹脆性模拟方法及应用[J]. 岩石力学与工程学报，2012，31(10)：2 088–2 095.(FU Jinwei，ZHU Weishen，WANG Xianggang，et al. An improved elastic-brittle simulation method of crack propagation process in jointed rock mass and its application[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(10)：2 088–2 095.(in Chinese))
[18] 杨振伟，金爱兵，周 喻，等.伯格斯模型参数调试与岩石蠕变特性颗粒流分析[J]. 岩土力学，2015，36(1)：240–248.(YANG Zhenwei，JIN Aibing，ZHOU Yu，et al. Parametric analysis of Burgers model and creep properties of rock with particle flow code[J]. Rock and Soil Mechanics，2015，36(1)：240–248.(in Chinese))
[19] 胡光辉，徐 涛，陈崇枫，等. 基于离散元法的脆性岩石细观蠕变失稳研究[J]. 工程力学，2018，35(9)：26–36.(HU Guanghui，XU Tao，CHEN Chongfeng，et al. A microscopic study of creep ang fracturing of brittle bocks based on discrete element method[J]. Engineering Mechanics，2018，35(9)：26–36.(in Chinese))
[20] 刘小军，刘新荣，王铁行，等. 考虑含水劣化效应的浅变质板岩蠕变本构模型研究[J]. 岩石力学与工程学报，2014，33(12)：2 384– 2 389.(LIU Xiaojun，LIU Xinrong，WANG Tiehang，et al. Creep model of low-grade metamorphic slate considering moisture degradation effect[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(12)：2 384–2 389.(in Chinese))
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2023, Vol. 42 
