Thermal-Force Coupled Unloading Failure Characterization in Granite with Different Fracture Inclinations

  • Zeng Weihao ,
  • Chen Zhenghong ,
  • Chen Qiunan ,
  • Xiong Guangwei ,
  • Chen Ying
Expand
  • 1. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411100, P.R. China;
    2. School of Transportation Engineering, Changsha University of Science and Technology, Changsha 410000, P.R. China

Received date: 2025-04-29

  Online published: 2026-04-28

Abstract

A large number of different inclinations of tectonic fracture exist for the Sichuan-Tibet Railway along the tunnel peripheral rock, and often in the high ground temperature and high stress coupling environment. In order to study the influence of fracture inclination on the unloading failure characteristics of hard rock under high temperature and high stress coupling, this paper analyzes the unloading rupture characteristics of granite specimens of a tunnel of Sichuan-Tibet Railway under 50 ℃ real-time temperature field through unloading test by adopting indoor test and numerical simulation method. The results show that: the unloading strength decreases with the increase of fracture inclination angle, when the fracture inclination angle is 0°, the unloading strength of the specimen under the 50 ℃ real-time temperature field is obviously smaller than the unloading strength at room temperature; the fracture specimen under the unloading condition has strong tensile damage characteristics, and the dilatancy phenomenon of the specimen under the 50 ℃ real-time temperature field is more obvious when the fracture inclination angle is 30°; When the fracture inclination angle is 0°, a penetrating fracture through the center of the pre-fracture is generated; under the real-time temperature field of 50 ℃, the larger the fracture inclination angle is, the more dispersed microcracks are developed in the unloading process of the specimen, and the smaller the inclination angle is of the pre-fracture, the earlier the accelerated point of fracture development occurs.

Cite this article

Zeng Weihao , Chen Zhenghong , Chen Qiunan , Xiong Guangwei , Chen Ying . Thermal-Force Coupled Unloading Failure Characterization in Granite with Different Fracture Inclinations[J]. Chinese Journal of Underground Space and Engineering, 2026 , 22(2) : 517 -527 . DOI: 10.20174/j.JUSE.2026.02.13

References

[1] 彭建兵, 崔鹏, 庄建琦.川藏铁路对工程地质提出的挑战[J]. 岩石力学与工程学报, 2020, 39(12): 2377-2389. (Peng Jianbing, Cui Peng, Zhuang Jianqi. Challenges to engineering geology of Sichuan—Tibet railway[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(12): 2377-2389. (in Chinese))
[2] 杨继华,崔臻,万伟锋,等.引黄济宁工程隧洞穿越活动性断裂响应特征研究[J].地下空间与工程学报,2025,21(1):283-292.(Yang Jihua, Cui Zhen, Wan Weifeng,et al.Study on the Response Characteristics of Tunnel Crossing Active Faults of the Yellow River to Xining Water Diversion Project[J].Chinese Journal of Underground Space and Engineering,2025,21(1):283-292.(in Chinese))
[3] 曹振生,徐海斌,虎晓敏,等.穿越断裂带隧道变形机制及NPR支护数值模拟研究[J].地下空间与工程学报,2025,21(6):2122-2132.(Cao Zhensheng,Xu Haibin,Hu Xiaomin,et al.Study on the deformation mechanism of tunnels crossing fault zones and numerical simulation of NPR support[J].Chinese Journal of Underground Space and Engineering,2025,21(6):2122-2132.(in Chinese))
[4] Wong R H C, Huang M L, Jiao M R, et al. The mechanisms of crack propagation from surface 3-d fracture underuniaxial compression[J]. Key Engineering Materials, 2004(261-263): 219-224.
[5] Wong R H C, Law C M,Chau K T, et al. Crack propagation from 3-D surface fractures in pmma and marble specimens under uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences, 2004, 43(3): 360.
[6] Robina H C, Wong Y S H, Guo L Y, et al. Anti-wing crack growth from surface flaw in real rock under uniaxial compression[A]// Fracture of Nano and Engineering Materials and Structures[C]. Alexandroupolis: Kluwer Academic Publishers, 2006.
[7] Xu R C, Zhao Y, Hu Y B, et al. Experimental investigation on the effect of preexisting orthogonal cross flaws on cracking behaviors and acoustic emission characteristics of red sandstone[J]. Theoretical & Applied Fracture Mechanics, 2022(122): 103634.
[8] 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): 3251-3256. (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. (in Chinese))
[9] 余明坤, 许国伟, 唐国栋, 等.预制裂隙类岩石材料的分步卸载试验研究[J].地下空间与工程学报,2020,16(6):1672-1681. (Yu Mingkun, Xu Guowei, Tang Guodong, et al. Experimental study on stepped unloading of rock-like materials with pre-existing fissure[J]. Chinese Journal of Underground Space and Engineering, 2020, 16(6):1672-1681. (in Chinese))
[10] 陈鹏宇.PFC2D模拟裂隙岩石裂纹扩展特征的研究现状[J].工程地质学报,2018,26(2):528-539. (Cheng Pengyu. Research progress on PFC2D simulation of crack propaga-tion characteristics of cracked rock[J]. Journal of Engineering Geology, 2018, 26(2):528-539. (in Chinese))
[11] Huang Y H, Yang S Q,Tian W L. Crack coalescence behavior of sandstone specimen containing two pre-existing flaws under different confining pressures(Article)[J]. Theoretical and Applied Fracture Mechanics, 2019(99): 118-130.
[12] 郭颖泉, 岑夺丰, 李悦, 等. 卸荷条件下岩体裂隙扩展贯通及能量演化机制[J].地下空间与工程学报,2022,18(5):1521-1531. (Guo Yingquan, Cen Duofeng, Li Yue, et al. Mechanism of Crack Propagation,Coalescence and Energy Evolution of Rock Mass under Unoading Condition[J]. Chinese Journal of Underground Space and Engineering,2022, 18(5):1521-1531. (in Chinese))
[13] 许锡昌, 刘泉声. 高温下花岗岩基本力学性质初步研究[J]. 岩土工程学报, 2000(3): 332-335. (Xu Xichang, Liu Quansheng. A preliminary study on basic mechanical properties for granite at high temperature)[J]. Chinese Journal of Geotechnical Engineering, 2000(3): 332-335. (in Chinese))
[14] Zhang L Y, Mao X B, Lu A H. Experimental study on the mechanical properties of rocks at high temperature[J]. Science China Technological Sciences, 2009, 52(3): 641-646.
[15] 李建林, 陈星, 党莉, 等. 高温后砂岩三轴卸荷试验研究[J]. 岩石力学与工程学报, 2011, 30(8): 1587-1595. (Li Jianlin, Chen Xing, Dang Li, et al. Triaxial unloading test of sandstone after high temperture[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(8): 1587-1595. (in Chinese))
[16] 陈国庆, 李天斌, 何勇华, 等. 深埋硬岩隧道卸荷热-力效应及岩爆趋势分析[J]. 岩石力学与工程学报, 2013, 32(8): 1554-1563. (Chen Guoqing, Li Tianbin, He Yonghua, et al. Thermo-mechanical coupling and rockburst tendency analysis of deep hard rock tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(8): 1554-1563. (in Chinese))
[17] Yin T B, Zhuang D D, Li M J, et al. Numerical simulation study on the thermal stressevolution and thermal cracking law of granite under heat conduction[J]. Computers and Geotechnics,2022.148:104813.
[18] 黄润秋, 黄达. 卸荷条件下花岗岩力学特性试验研究[J]. 岩石力学与工程学报, 2008(11): 2205-2213. (Huang Runqiu, Huang Da. Experimental research on mechanical proerties of granites under unloading condition[J]. Chinese Journal of Rock Mechanics and Engineering, 2008(11): 2205-2213. (in Chinese))
[19] 邱士利, 冯夏庭, 张传庆, 等. 不同初始损伤和卸荷路径下深埋大理岩卸荷力学特性试验研究[J]. 岩石力学与工程学报, 2012, 31(8): 1686-1697. (Qiu Shili, Feng Xiating, Zhang Chuanqing, experimental reaserch on mechanical properties of deep marble under diffrent initial damage levels and unloading paths[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(8): 1686-1697. (in Chinese))
[20] 吴刚, 孙钧. 卸荷应力状态下裂隙岩体的变形和强度特性[J]. 岩石力学与工程学报, 1998(6): 615-621.(Wu Gang, Sun Jun. Deformation and strength characters of jointed rock mass under unloading stress states[J]. Chinese Journal of Rock Mechanics and Engineering, 1998(6): 615-621. (in Chinese))
[21] 李夕兵, 陈正红, 曹文卓, 等. 不同卸荷速率下大理岩破裂时效特性与机理研究[J]. 岩土工程学报, 2017, 39(9): 1565-1574.(Li Xibing, Chen Zhenghong, Cao Wenzhuo, et al. Time-effect properties and mechanisms of marble failure under different unloading rates[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(9): 1565-1574. (in Chinese))
[22] Li X B, Chen Z H,Weng L, et al. Unloading responses of pre-flawed rock specimens under different unloading rates(Article)[J]. Transactions of Nonferrous Metals Society of China (English Edition), 2019, 29(7): 1516-1526.
[23] Yang S Q, Jing H W, Huang Y H, et al. Fracture mechanical behavior of red sandstone containing a single fissure and two parallel fissures after exposure to different high temperature treatments[J]. Journal of Structural Geology, 2014, 69: 245-264.
[24] Yang Z, Yang S Q, Chen M.Peridynamic simulation on fracture mechanical behavior of granite containing a single fissure after thermal cycling treatment[J]. Computers and Geotechnics, 2020, 120: 103414.
[25] 龙运丁.真三轴条件下高温裂隙花岗岩的力学及声发射特性研究[D].重庆: 重庆大学,2023. (Long Yunding. Study on the mechanies and acoustic emission characteristics of high temperature treatment fractured graniteunder true triaxial conditions[D]. Chongqing: Chongqing University, 2005.(in Chinese))
[26] 中华人民共和国水利部. 水利水电工程岩石试验规程(SL 264-2001)[S]. 北京: 水利水电出版社, 2001(Ministry of Water Resources of the People's Republic of China. Specifications for rock tests in water conservancy and hydroelectric engineering(SL 264-2001) [S].Beijing: China Water & Power Press, 2001. (in Chinese))
[27] 易婷, 唐建新, 王艳磊. 裂隙倾角及数目对岩体强度和破坏模式的影响[J]. 地下空间与工程学报, 2021, 17(1): 98-106, 134.(Yi Ting, Tang Jianxin, Wang Yanlei. Effect of fracture dip angle and number on mechanical properties and failure modes of rock mass[J]. Chinese Journal of Underground Space and Engineering, 2021, 17(1): 98-106, 134. (in Chinese))
[28] Zhao Z H. Thermal influence on mechanical properties of granite: Amicrocracking perspective[J]. Rock Mechanics and Rock Engineering, 2016,49(3): 747-762.
Outlines

/