|
|
|
| Experimental research on deformation and instability characteristics of hollow cylindrical granite with weak interlayers under fatigue-creep loading |
| YI Xuefeng1，2，WANG Yu1，2，LI Peng1，2，CAI Meifeng1，2 |
(1. School of Civil and Resource Engineering，University of Science and Technology Beijing，Beijing 100083，China；
2. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines，University of Science
and Technology Beijing，Beijing 100083，China) |
|
|
|
|
Abstract To investigate the physical processes and mechanical responses of deep-seated tectonic fragmentation zones in metal mines induced by alternative fatigue-creep loads，hollow cylindrical granite specimens with varying inclinations of weak interlayers were prepared，and the impact of weak interlayer inclinations on the time-dependent instability of the composite structure specimens was investigated by employing a combination of macroscopic mechanical tests and microscopic CT scanning. The findings indicate that：(1) The resistance of composite structure specimens to alternative fatigue-creep loads is significantly influenced by the inclination of weak interlayers. As the inclination of weak interlayers increases from 5° to 35°，the confining pressure unloading at the point of failure gradually decreases，with values of 11.58，7.49，7.22 and 5.07 MPa，respectively. (2) When subjected to the loading path of alternative fatigue and creep，the composite structure specimens exhibit nonlinear，exponential relationships in their axial，radial，and volumetric strains，as well as in dissipated strain energy，with the loading stages. However，during the final loading stage，the composite structure specimens display unique deformation and energy evolution characteristics. (3) The energy dissipation of the composite structure is characterized by the initiation，propagation，and connection of internal cracks in the rock matrix，alongside the shear slip deformation of the weak interlayers. The incompatible deformation between the weak interlayers and the rock matrix leads to volume expansion and rock matrix fracturing. Notably，with the increase in interlayer inclinations，the energy dissipation of the composite structure shows a decreasing- then-increasing trend. (4) CT scanning test results indicate that the connection of failure surfaces between the weak interlayers and cavities is the fundamental cause of failure in the composite structure. The final plastic deformation of the weak interlayers shows a positive correlation with the interlayer inclinations. These research findings have significant theoretical implications for revealing the temporal disturbance mechanism of large deformations in the surrounding rocks of deep-seated tectonic fragmentation zones in mining engineering.
|
|
|
|
|
|
[1] 朱要亮，俞 缙，许汉华，等. 大理岩短时蠕变–低周疲劳交替作用力学特性试验研究[J]. 岩土工程学报，2022，44(11)：2 115–2 124. (ZHU Yaoliang，YU Jin，XU Hanhua，et al. Experimental study on mechanical properties of marble under alternation between short-time creep and low-cycle fatigue[J]. Chinese Journal of Geotechnical Engineering，2022，44(11)：2 115–2 124.(in Chinese))
[2] 赵然惠，周端光，孙广忠. 软弱结构面的工程力学效应[J]. 工程勘察，1981，11(6)：56–59.(ZHAO Ranhui，ZHOU Duanguang，SUN Guangzhong. Engineering mechanical effects of weak structural surfaces[J]. Geotechnical Investigation and Surveying，1981，11(6)： 56–59.(in Chinese))
[3] 李桂臣. 软弱夹层顶板巷道围岩稳定与安全控制研究[博士学位论文][D]. 北京：中国矿业大学，2008.(LI Guichen. Study on the surrounding rock stability and safety control of roadways roof embedded weak intercalated seam[Ph. D. Thesis][D]. Beijing：China University of Mining and Technology，2008.(in Chinese))
[4] 张 玉，赵海斌，徐卫亚，等. 某水电站坝基挠曲破碎带工程力学特性试验研究[J]. 岩土力学，2013，34(12)：3 437–3 445.(ZHANG Yu，ZHAO Haibin，XU Weiya，et al. Experimental investigations on engineering mechanical properties of sandstone in the deflection fractured zone in dam foundation of a hydropower station[J]. Rock and Soil Mechanics，2013，34(12)：3 437–3 445.(in Chinese))
[5] 杨 辉. 穿越断层破碎带隧道围岩大变形机制及控制技术研究[硕士学位论文][D]. 阜新：辽宁工程技术大学，2022.(YANG Hui. Study on large deformation mechanism and control technology of surrounding rock in tunnel crossing fault broken zone[M. S. Thesis][D]. Fuxin：Liaoning Technical University，2022.(in Chinese))
[6] 张声宇. 断层破碎带夹泥岩体力学特性试验与数值分析[硕士学位论文][D]. 南昌：华东交通大学，2022.(ZHANG Shengyu. Test and numerical analysis of mechanical properties of muddy rock mass in fault fracture zone[M. S. Thesis][D]. Nanchang：East China Jiaotong University，2022.(in Chinese))
[7] 顾锦健，徐卫亚，张 玉，等. 挠曲核部破碎带岩石力学特性的试验研究[J]. 地下空间与工程学报，2012，8(5)：975–980.(GU Jinjian，XU Weiya，ZHANG Yu，et al. Experimental investigations on the mechanical properties of rock in the fractured zone of deflection core[J]. Chinese Journal of Underground Space and Engineering，2012，8(5)：975–980.(in Chinese))
[8] 张 玉，徐卫亚，王 伟，等. 破碎带软岩流变力学试验与参数辨识研究[J]. 岩石力学与工程学报，2014，33(增2)：3 412–3 420. (ZHANG Yu，XU Weiya，WANG Wei，et al. Study of rheological tests and its parameters identification of soft rock in fractured belt[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.2)：3 412–3 420.(in Chinese))
[9] ZHANG Y，SHAO J，XU W，et al. Time-dependent behavior of cataclastic rocks in a multi-loading triaxial creep test[J]. Rock Mechanics and Rock Engineering，2016，49：3 793–3 803.
[10] 何 川，李 林，张 景，等. 隧道穿越断层破碎带震害机制研究[J]. 岩土工程学报，2014，36(3)：427–434.(HE Chuan，LI Lin，ZHANG Jing，et al. Seismic damage mechanism of tunnels through fault zones[J]. Chinese Journal of Geotechnical Engineering，2014，36(3)：427–434.(in Chinese))
[11] SONG Z，ZHANG J，WANG S，et al. Energy evolution characteristics and weak structure-“energy flow”impact damaged mechanism of deep-bedded sandstone[J]. Rock Mechanics and Rock Engineering，2023，56：2 017–2 047.
[12] 李夕兵，吴秋红，董陇军，等. 含充填物的厚壁圆筒砂岩的力学性质研究[J]. 岩土工程学报，2015，37(12)：2 149–2 156.(LI Xibing，WU Qiuhong，DONG Longjun，et al. Mechanical property of thick-walled hollow cylinders of sandstone with filling[J]. Chinese Journal of Geotechnical Engineering，2015，37(12)：2 149–2 156.(in Chinese))
[13] YANG S Q. Fracturing mechanism of compressed hollow-cylinder sandstone evaluated by X-ray micro-CT scanning[J]. Rock Mechanics Rock Engineering，2018，51：2 033–2 053.
[14] WANG S，LIU Y，DU K，et al. Waveform features and failure patterns of hollow cylindrical sandstone specimens under repetitive impact and triaxial confinements[J]. Geomechanics and Geophysics for Geo- Energy and Geo-Resources，2020，6：1–18.
[15] WANG J，MA D，LI Z，et al. Experimental investigation of damage evolution and failure criterion on hollow cylindrical rock samples with different bore diameters[J]. Engineering Fracture Mechanics，2022，260：108182.
[16] ZHOU X，ZHANG D，NOWAMOOZ H，et al. Experimental and numerical analyses of double flawed sandstone with a circular cavity under static-dynamic loads[J]. Theoretical and Applied Fracture Mechanics，2023，126：103975.
[17] 王 宇，杨浩男，易雪枫，等. 增幅疲劳荷载作用下含双裂隙花岗岩空心圆柱破裂演化试验研究[J]. 岩石力学与工程学报，2022，41(7)：1 325–1 337.(WANG Yu，YANG Haonan，YI Xuefeng， et al. Investigation on fracture evolution of pre-flawed hollow-cylinder granite under increasing-amplitude cyclic loads[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(7)：1 325–1 337.(in Chinese))
[18] HU X，GONG X，HU H，et al. Cracking behavior and acoustic emission characteristics of heterogeneous granite with double pre-existing filled flaws and a circular hole under uniaxial compression：Insights from grain-based discrete element method modeling[J]. Bulletin of Engineering Geology and the Environment，2022，81：162.
[19] 颜丙乾. 三山岛金矿节理岩体变形破坏机制及滨海开采突水防治[博士学位论文][D].北京：北京科技大学，2021.(YAN Bingqian. Study on failure mechanism of jointed rock mass and prevention of water inrush from coastal mining in Sanshandao Gold Mine[Ph. D. Thesis][D]. Beijing：University of Science Technology Beijing，2021.(in Chinese))
[20] 严荣富. 采动–断层双重影响下竖井变形破坏规律及机制研究[博士学位论文][D]. 北京：北京科技大学，2023.(YAN Rongfu. Law and mechanism of shaft deformation and failure under the dual influence of mining and fault[Ph. D. Thesis][D]. Beijing：University of Science Technology Beijing，2023.(in Chinese))
[21] BRUNEAU G，TYLER D B，HADJIGEORIOU J，et al. Influence of faulting on a mine shaft—a case study：part I—Background and instrumentation[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(1)：95–111.
[22] 安 平. 三山岛金矿床断裂带渗透性结构及其控矿模式[硕士学位论文][D]. 北京：中国地质大学，2018.(AN Ping. Ore-controlling model of permeability structures in fault zone Sanshandao gold deposit，Shandong Province，China[M. S. Thesis][D]. Beijing：China University of Geosciences，2018.(in Chinese))
[23] CHOENS R，LEE M，INGRAHAM M，et al. Experimental studies of anisotropy on borehole breakouts in Mancos Shale[J]. Journal of Geophysical Research：Solid Earth，2019，124(4)：4 119–4 141.
[24] 李 鹏. 静动态荷载下节理化岩体硐室围岩破坏机制及其稳定性与控制研究[博士学位论文][D]. 北京：北京科技大学，2020.(LI Peng. study on failure mechanism and stability control of surrounding rock of underground openings in jointed rock mass under static and dynamic loading[Ph. D. Thesis][D]. Beijing：University of Science Technology Beijing，2020.(in Chinese))
[25] 徐文杰，胡瑞林. 土石混合体概念、分类及意义[J]. 水文地质工程地质，2009，36(4)：50–56.(XU Wenjie，HU Ruilin. Conception，classification and significations of soil-rock mixture[J]. Hydrogeology and Engineering Geology，2009，36(4)：50–56.(in Chinese))
[26] 王乐华，牛草原，张冰祎，等. 不同应力路径下深埋软岩力学特性试验研究[J]. 岩石力学与工程学报，2019，38(5)：973–981.(WANG Lehua，NIU Caoyuan，ZHANG Bingyi，et al. Experimental study on mechanical properties of deep-buried soft rock under different stress paths[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(5)：973–981.(in Chinese))
[27] WANG Yu，YI X，LONG D，et al. On the fracture and energy characteristics of rock-backfill composite structure specimens exposed to fatigue-creep interaction loading[J]. Fatigue and Fracture of Engineering Materials and Structures，2023，47(1)：153–169.
[28] HUANG D，LI Y. Conversion of strain energy in triaxial unloading tests on marble[J]. International Journal of Rock Mechanics and Mining Sciences，2014，66：160–168.
[29] WANG Y，TANG P，HAN J，et al. Energy-driven fracture and instability of deeply buried rock under triaxial alternative fatigue loads and multistage unloading conditions：Prior fatigue damage effect[J]. International Journal of Fatigue，2023，168：107410. |
|
|
|
2024, Vol. 43 
