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WANG Jianming, CUI Xinnan, CHEN Zhonghui, CHEN Chong. Mechanism and stability of unloading fracture in rock slopes containing trailing edge cracks in open pit mines[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(2): 345-353. DOI: 10.11779/CJGE20211541
Citation: WANG Jianming, CUI Xinnan, CHEN Zhonghui, CHEN Chong. Mechanism and stability of unloading fracture in rock slopes containing trailing edge cracks in open pit mines[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(2): 345-353. DOI: 10.11779/CJGE20211541

Mechanism and stability of unloading fracture in rock slopes containing trailing edge cracks in open pit mines

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  • Received Date: December 23, 2021
  • Available Online: February 23, 2023
  • Based on the real structural characteristics of slopes and using the theory of fracture mechanics, the formulas for calculating the stress intensity factor and the critical instability height of trailing edge crack tip under unloading are deduced, Considering the extension length of branch cracks, the mechanical model for crack expansion in slope rock mass is established, and the method for the stability coefficient of slopes is put forward, and is verified through an engineering example. The results show that: (1) The stronger the unloading effects, the greater the intensity factor of compound stress at the tip of the trailing edge crack, and the worse the stability of the slope. (2) The larger the inclination angle of the trailing edge crack, the smaller the critical expansion height and the larger the crack initiation angle. The larger the average height, the smaller the critical expansion height, and the larger the crack initiation angle. The crack is more and more deviating from the slope expansion, and the crack length has no effects on the critical propagation height and the initiation angle. (3) The factor of safety of the slope increases with the increase of the crack inclination angle, average height and fracture toughness, and decreases with the increase of the crack length, lower crack angle and unloading tensile stress. The research results may provide some theoretical reference for understanding and controlling the collapse and landslide disasters of rock slopes with trailing edge cracks induced by excavation unloading.
  • [1]
    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. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201802007.htm

    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) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201802007.htm
    [2]
    王建明, 陈忠辉, 周子涵, 等. 不同卸荷速率下节理岩桥变形破坏及裂隙扩展演化试验研究[J]. 矿业科学学报, 2020, 5(4): 382-392. doi: 10.19606/j.cnki.jmst.2020.04.004

    WANG Jianming, CHEN Zhonghui, ZHOU Zihan, et al. Experimental study on deformation failure and crack propagation evolvement of jointed rock bridge under different unloading rates[J]. Journal of Mining Science and Technology, 2020, 5(4): 382-392. (in Chinese) doi: 10.19606/j.cnki.jmst.2020.04.004
    [3]
    黄达, 张晓景, 顾东明. "三段式"岩石滑坡的锁固段破坏模式及演化机制[J]. 岩土工程学报, 2018, 40(9): 1601-1609. http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/abstract/abstract17502.shtml

    HUANG Da, ZHANG Xiaojing, GU Dongming. Failure pattern and evolution mechanism of locking section in rock slope with three-section landslide mode[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(9): 1601-1609. (in Chinese) http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/abstract/abstract17502.shtml
    [4]
    ZHANG K, TAN P, MA G W, et al. Modeling of the progressive failure of an overhang slope subject to differential weathering in Three Gorges Reservoir, China[J]. Landslides, 2016, 13(5): 1303-1313. doi: 10.1007/s10346-015-0672-4
    [5]
    WU L Z, SHAO G Q, HUANG R Q, et al. Overhanging rock: theoretical, physical and numerical modeling[J]. Rock Mechanics and Rock Engineering, 2018, 51(11): 3585-3597. doi: 10.1007/s00603-018-1543-9
    [6]
    王来贵, 习彦会, 刘向峰, 等. 地震载荷作用下岩质边坡应力状态调整与破坏规律分析[J]. 土木工程学报, 2015, 48(12): 109-115. https://www.cnki.com.cn/Article/CJFDTOTAL-TMGC201512015.htm

    WANG Laigui, XI Yanhui, LIU Xiangfeng, et al. Analysis on stress state adjustment and collapse of rock slope subject to seismic loads[J]. China Civil Engineering Journal, 2015, 48(12): 109-115. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-TMGC201512015.htm
    [7]
    钟助, 黄达, 黄润秋. "挡墙溃屈"型滑坡锁固段抗滑稳定性研究[J]. 岩土工程学报, 2016, 38(9): 1734-1740. http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/abstract/abstract16725.shtml

    ZHONG Zhu, HUANG Da, HUANG Runqiu. Anti-sliding stability of locked patch of rock slopes with landslide mode of retaining wall collapse[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(9): 1734-1740. (in Chinese) http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/abstract/abstract16725.shtml
    [8]
    吴永, 何思明, 王东坡, 等. 开挖卸荷岩质坡体的断裂破坏机理[J]. 四川大学学报(工程科学版), 2012, 44(2): 52-58. https://www.cnki.com.cn/Article/CJFDTOTAL-SCLH201202010.htm

    WU Yong, HE Siming, WANG Dongpo, et al. Fracture failure mechanism of rock slope under excavation[J]. Journal of Sichuan University (Engineering Science Edition), 2012, 44(2): 52-58. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SCLH201202010.htm
    [9]
    常远, 常来山, 任富强, 等. 节理岩体边坡采动损伤与可靠性分析[J]. 煤炭学报, 2018, 43(5): 1305-1311. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201805013.htm

    CHANG Yuan, CHANG Laishan, REN Fuqiang, et al. Reliability and damage analysis on jointed rock mass slope[J]. Journal of China Coal Society, 2018, 43(5): 1305-1311. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201805013.htm
    [10]
    CHANG Z G, CAI Q X, ZHOU W, et al. Effects of the loading and unloading conditions on crack propagation in high composite slope of deep open-pit mine[J]. Advances in Civil Engineering, 2019, 2019: 1-11.
    [11]
    李明, 张嘎, 胡耘, 等. 边坡开挖破坏过程的离心模型试验研究[J]. 岩土力学, 2010, 31(2): 366-370. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201002009.htm

    LI Ming, ZHANG Ga, HU Yun, et al. Centrifuge model tests on excavation-induced failure of slopes[J]. Rock and Soil Mechanics, 2010, 31(2): 366-370. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201002009.htm
    [12]
    习朝辉, 裴向军, 穆成林, 等. 顺层岩质边坡开挖变形特征模型试验研究[J]. 铁道建筑, 2018, 58(12): 100-103. https://www.cnki.com.cn/Article/CJFDTOTAL-TDJZ201812024.htm

    XI Zhaohui, PEI Xiangjun, MU Chenglin, et al. Model test study of deformation characteristics of bedding rock slope excavation[J]. Railway Engineering, 2018, 58(12): 100-103. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-TDJZ201812024.htm
    [13]
    ZHU C, HE M C, KARAKUS M, et al. Investigating toppling failure mechanism of anti-dip layered slope due to excavation by physical modelling[J]. Rock Mechanics and Rock Engineering, 2020, 53(11): 5029-5050.
    [14]
    李韬, 徐奴文, 戴峰, 等. 白鹤滩水电站左岸坝肩开挖边坡稳定性分析[J]. 岩土力学, 2018, 39(2): 665-674. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201802034.htm

    LI Tao, XU Nuwen, DAI Feng, et al. Stability analysis of left bank abutment slope at Baihetan hydropower station subjected to excavation[J]. Rock and Soil Mechanics, 2018, 39(2): 665-674. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201802034.htm
    [15]
    李新坡, 何思明. 节理岩质边坡破坏过程的PFC2D数值模拟分析[J]. 四川大学学报(工程科学版), 2010, 42(增刊1): 70-75. https://www.cnki.com.cn/Article/CJFDTOTAL-SCLH2010S1012.htm

    LI Xinpo, HE Siming. Numerical analysis of the failure of heavily jointed rock slopes using PFC2D[J]. Journal of Sichuan University (Engineering Science Edition), 2010, 42(S1): 70-75. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SCLH2010S1012.htm
    [16]
    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. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200808004.htm

    HUANG Runqiu. 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) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200808004.htm
    [17]
    哈秋舲. 加载岩体力学与卸荷岩体力学[J]. 岩土工程学报, 1998, 20(1): 114. http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/abstract/abstract10086.shtml

    HA Qiuling. Loading rock mechanics and unloading rock mechanics[J]. Chinese Journal of Geotechnical Engineering, 1998, 20(1): 114. (in Chinese) http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/abstract/abstract10086.shtml
    [18]
    赵延林, 曹平, 万文, 等. 随机卸荷岩体裂纹流变断裂模型与数值模拟[J]. 中南大学学报(自然科学版), 2015, 46(12): 4647-4656. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGD201512035.htm

    ZHAO Yanlin, CAO Ping, WAN Wen, et al. Model and numerical simulation of rheological fracture of random unloading rock mass cracks[J]. Journal of Central South University (Science and Technology), 2015, 46(12): 4647-4656. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGD201512035.htm
    [19]
    周子涵, 陈忠辉, 王建明, 等. 卸荷条件下岩石平行偏置双裂隙的扩展规律研究[J]. 岩土工程学报, 2020, 42(4): 721-730. http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/abstract/abstract18179.shtml

    ZHOU Zihan, CHEN Zhonghui, WANG Jianming, et al. Propagation of offset parallel cracks in rock under unloading conditions[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(4): 721-730. (in Chinese) http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/abstract/abstract18179.shtml
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