XU Jin-xing;LI Wen;ZHU Sheng;LIU Ai-jing;LIU Ying-qi;WU Li;

• 1:CCCC SHEC (Kunming) Construction Co.
• 2:Ltd.
• 3:Faculty of Engineering
• 4:China University of Geosciences

Abstract：

To study the influence of saturation on dynamic mechanical behavior and energy absorption in layered phyllite,phyllite specimens with varying bedding angles(0°,30°,60°,90°) and moisture conditions(dry versus saturated) were prepared,and then a dynamic impact test was carried out by using the Split Hopkinson Pressure Bar(SHPB) test system. Finally,the mechanical properties and energy absorption characteristics of the specimens under varying bedding angles and saturation levels were analyzed. The results show that the deformation and failure mode of phyllite are influenced by the combined effects of bedding dip angle and moisture conditions. The mechanical parameter variation follows the sequence 0° > 90° > 30° > 60° for bedding angles,with saturated specimens exhibiting lower values than dry specimens. Specimens predominantly exhibited crushing failure at 0° inclination,shear failure along bedding planes at 30° and 60°,and compressive bar instability at 90°,while showing higher degrees of fragmentation under saturated conditions. Experimental results demonstrate that saturated phyllite specimens exhibit higher energy dissipation density across all tested bedding angles compared to dry specimens,with maximum energy absorption occurring at 0° inclination angle and minimum dissipation observed at 90° inclination angle.

Key Words： layered phyllite;Split Hopkinson Pressure Bar;dynamic loading;saturated conditions;energy dissipation

Abstract:

Keywords:

Foundation: 国家自然科学基金项目(41672260)~~

Authors: XU Jin-xing;LI Wen;ZHU Sheng;LIU Ai-jing;LIU Ying-qi;WU Li;

References：

• [1]CHEN Long-long,WANG Zhi-feng,WANG Ya-qiong,et al.Characteristics and failure analysis of a railway tunnel collapse influenced by cavity in phyllite strata[J].Engineering Failure Analysis,2022,142:106794．
• [2]WU Ya-bin,YANG Dong-jie.Study on mechanical characteristics of phyllite by conventional triaxial compression under multi-factors coupling action[J].Scientific Reports,2024,14(1):1-12．
• [3]许江波，余洋林，孙国政，等．静动态压缩下千枚岩长径比效应影响研究[J]．重庆大学学报，2024,47(6):43-57．[3]XU Jiang-bo,YU Yang-lin,SUN Guo-zheng,et al.Influence of phyllite aspect ratio under static and dynamic compression[J].Journal of Chongqing University,2024,47(6):43-57.(in Chinese)
• [4]常伟学，梁庆国，李奇伟，等．富水千枚岩隧道大变形特征及控制措施研究[J]．现代隧道技术，2024,61(3):236-244,252．[4]CHANG Wei-xue,LIANG Qing-guo,LI Qi-wei,et al.Study on large deformation characteristics and control measures of water-rich phyllite rock tunnels[J].Modern Tunnelling Technology,2024,61 (3):236-244,252.(in Chinese)
• [5]CHEN Jian-xun,LUO Yan-bin,LI Yao,et al.Variation of rock mass pressure during tunnel construction in phyllite stratum[J].Mathematical Problems in Engineering,2020,2020(1):3918787．
• [6]XU Guo-wen,HE Chuan,BAI Rong-min,et al.Experimental and numerical study of phyllite's anisotropic behavior in 3D space under brazilian test conditions[J].Rock Mechanics and Rock Engineering,2024,57:10747-10784．
• [7]ZHANG Jia-bing,DU Rong-huan,CHEN Yi-ling,et al.Experimental investigation of the mechanical properties and energy evolution of layered phyllite under uniaxial multilevel cyclic loading[J].Rock Mechanics and Rock Engineering,2023,56(6):4153-4168．
• [8]ZHAO Jin-peng,TAN Zhong-sheng,LI Qing-lou,et al.Characteristics and mechanism of large deformation of squeezing tunnel in phyllite stratum[J].Canadian Geotechnical Journal,2023,61(1):59-74．
• [9]LI Yong-fei,ZHAO Bao-yun,YANG Jiao-sheng,et al.Experimental study on the influence of confining pressure and bedding angles on mechanical properties in coal[J].Minerals,2022,12(3):345．
• [10]GUO Xiao-long,TAN Zhong-sheng,WANG Xiao,et al.Effect of bedding angle and mineral composition on mechanical properties and fracture behavior of phyllite under unloading confining pressures[J].Geotechnical and Geological Engineering,2020,38:3611-3621．
• [11]FU He-lin,HU Kai-xun,SHI Yue,et al.Deformation behaviour and damage evolution of carbonaceous phyllite under cyclic triaxial loading[J].Materials,2023,16(13):4612．
• [12]GUO Xiao-long,FAN Xiang-sen,TAN Zhong-sheng.Deformation control benchmarks and secondary lining construction timing in squeezing phyllite tunnels:A case study of Chengdu-Lanzhou Railway[J].Tunnelling and Underground Space Technology,2024,143:105454．
• [13]VILLALOBOS F A,RODRíGUEZ P A,VERA M.Study of the anisotropic tensile and compressive strength of a foliated phyllite[J].Proceedings of the Institution of Civil Engineers-Geotechnical Engineering,2023,176(1):15-26．
• [14]王小良．深部复杂应力路径下煤力学行为各向异性研究[D]．北京:中国矿业大学(北京)，2023．[14]WANG Xiao-liang.Anisotropic study of coal mechanical behavior under deepcomplex stress paths[D].Beijing:China University of Mining and Technology-Beijing,2023.(in Chinese)
• [15]侯振坤，杨春和，郭印同，等．单轴压缩下龙马溪组页岩各向异性特征研究[J]．岩土力学，2015,36(9):2541-2550．[15]HOU Zhen-kun,YANG Chun-he,GUO Yin-tong,et al.Experimental study on anisotropic properties of Longmaxi formation shale under uniaxial compression[J].Rock and Soil Mechanics,2015,36(9):2541-2550.(in Chinese)
• [16]邓华锋，李涛，李建林，等．层状岩体各向异性声学和力学参数计算方法研究[J]．岩石力学与工程学报，2020,39(S1):2725-2732．[16]DENG Hua-feng,LI Tao,LI Jian-lin,et al.Study on calculation method of anisotropic acoustic and mechanical parameters of layered rock[J].Chinese Journal of Rock Mechanics and Engineering,2020,39(S1):2725-2732.(in Chinese)
• [17]KOU Bao-fu,ZHANG Deng-ke,MENG Tao,et al.Micro and macro evaluation of tensile characteristics of anisotropic rock mass after high temperatures treatment-a case study of Lingshi Gneiss[J].Geothermics,2022,102:102409．
• [18]SHI Xiao-shan,ZHAO Yi-xin,DANESH N N,et al.Role of bedding plane in the relationship between Mode-Ifracture toughness and tensile strength of shale[J].Bulletin of Engineering Geology and the Environment,2022,81(2):14．
• [19]刘奇，许家杭，李青海，等．酸腐蚀下层状砂岩各向异性力学特性研究[J]．采矿与岩层控制工程学报，2024,6(6):66-77．[19]LIU Qi,XU Jia-hang,LI Qing-hai,et al.Study on the anisotropic mechanical properties of bedding sandstone under acid corrosion[J].Journal of Mining and Strata Control Engineering,2024,6(6):66-77.(in Chinese)
• [20]刘运思，何楚韶，傅鹤林，等．层状板岩动静拉伸力学特性及破坏模式研究[J]．铁道科学与工程学报，2020,17(11):2789-2797．[20]LIU Yun-si,HE Chu-shao,FU He-lin,et al.Study on dynamic and static mechanical properties and failure mode of layered slate[J].Journal of Railway Science and Engineering,2020,17(11):2789-2797.(in Chinese)
• [21]周喻，邹世卓，高永涛，等．动载下层状岩体力学特性试验与数值模拟[J]．哈尔滨工业大学学报，2023,55(6):93-109．[21]ZHOU Yu,ZOU Shi-zhuo,GAO Yong-tao,et al.Test and numerical simulation for mechanical properties of laminated rock mass under dynamic loading[J].Journal of Harbin Institute of Technology,2023,55 (6):93-109.(in Chinese)
• [22]王健，李二兵，谭跃虎，等．层状盐岩及泥岩夹层动态力学特性对比试验研究[J]．岩石力学与工程学报，2017,36(12):3002-3011．[22]WANG Jian,LI Er-bing,TAN Yue-hu,et al.Comparative experimental study on dynamic mechanical properties of bedded salt rock and mudstone interbed[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(12):3002-3011.(in Chinese)
• [23]杨仁树，李炜煜，方士正，等．层状复合岩体冲击动力学特性试验研究[J]．岩石力学与工程学报，2019,38(9):1747-1757．[23]YANG Ren-shu,LI Wei-yu,FANG Shizheng,et al.Experimental study on impact dynamic characteristics of layered composite rocks[J].Chinese Journal of Rock Mechanics and Engineering,2019,38 (9):1747-1757.(in Chinese)
• [24]ZHANG Xue-min,OU Xue-feng,GONG Feng-qiang,et al.Effects of bedding on the dynamic compressive properties of low anisotropy slate[J].Rock Mechanics and Rock Engineering,2019,52:981-990．
• [25]李地元，高飞红，刘濛，等．动静组合加载下含孔洞层状砂岩破坏机制探究[J]．岩土力学，2021,42(8):2127-2140．[25]LI Di-yuan,GAO Fei-hong,LIU Meng,et al.Research on failure mechanism of stratified sandstone with precracked hole under combined static-dynamic loads[J].Rock and Soil Mechanics,2021,42(8):2127-2140.(in Chinese)
• [26]HUANG Lin-qi,GUO Yi-de,LI Xi-bing.Mechanical response to dynamic compressive load applied to shale after thermal treatment[J].Journal of Natural Gas Science and Engineering.2022;102:104565．
• [27]王礼立，胡时胜．应力波基础[M].3版．北京:国防工业出版社，2023．[27]WANG Li-li,HU Shi-sheng.Foundation of stress waves[M].3th ed.Beijing:National Defense Industry Press,2023.(in Chinese)
• [28]LI Bo,YE Xin-na,DOU Zi-hao,et al.Shear strength of rock fractures under dry,surface wet and saturated conditions[J].Rock Mechanics and Rock Engineering,2020,53:2605-2622．
• [29]JAEGER J C.Shear failure of anistropic rocks[J].Geological Magazine,1960,97(1):65-72.