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| Brazilian splitting tests of slate considering three-dimensional foliation effect |
| DING Changdong1，2，HU Dawei1，2，ZHOU Hui1，2，LU Jingjing1，2，MA Dongdong1，2，ZHANG Yang3 |
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；
3. PetroChina Tarim Oilfield Company，Korla，Xinjiang 841000，China) |
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Abstract The slate with foliations exhibits significant anisotropies in terms of physical and mechanical properties. Brazilian splitting tests were carried out considering two factors such as the foliation angle and the loading direction，and the three-dimensional structure effects of foliation planes were studied in depth. The results show that the three-dimensional structure effects of foliation planes have a significant influence on the mechanical strength and failure characteristics of slate and that the variation trends of Brazilian splitting strength with loading direction are obviously different at different foliation angles. When the foliation angle ranges from 0°to 15° or from 75°to 90°，the three-dimensional spatial effect of the fracture surface is not obvious and the macroscopic cracks on both sides of the disc have certain similarities. When both the foliation angle and the loading direction are in the range of 30° to 60°，however，the fracture surfaces present a three-dimensional spatial distribution due to the coupling effect of the two factors and the macroscopic cracks formed on both sides of the disc exhibit an approximately anti-symmetric positional relationship. The energy storage capacity of slate in Brazilian splitting tests is negatively correlated with the foliation angle but positively with the Brazilian splitting strength. It is also revealed that the foliation angle and the loading direction respectively have more significant effects on the Brazilian splitting strength and the fracture pattern，and that，with increasing the foliation angle，the anisotropy ratios of the Brazilian splitting strength and the energy show an increasing trend. The research results can provide a reference for the analysis of tensile mechanical properties of transversely isotropic rocks.
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[1] CARNEIRO F，BARCELLOS A. International association of testing and research laboratories for materials and structures[J]. RILEM Bull，1953，13：99–125.
[2] WANG J，XIE L，XIE H，et al. Effect of layer orientation on acoustic emission characteristics of anisotropic shale in Brazilian tests[J]. Journal of Natural Gas Science and Engineering，2016，36：1 120–1 129.
[3] ZHANG S W，SHOU K J，XIAN X F，et al. Fractal characteristics and acoustic emission of anisotropic shale in Brazilian tests[J] Tunnelling and Underground Space Technology，2018，71：298–308.
[4] 侯 鹏，高 峰，杨玉贵，等. 考虑层理影响页岩巴西劈裂及声发射试验研究[J]. 岩土力学，2016，37(6)：1 603–1 612.(HOU Peng，GAO Feng，YANG Yugui，et al. Effect of bedding plane direction on acoustic emission characteristics of shale in Brazilian tests[J]. Rock and Soil Mechanics，2016，37(6)：1 603–1 612.(in Chinese))
[5] XU G，HE C，CHEN Z，et al. Transverse isotropy of phyllite under brazilian tests：laboratory testing and numerical simulations[J]. Rock Mechanics and Rock Engineering，2018，51(4)：1 111–1 135.
[6] DEBECKER B，VERVOORT A. Experimental observation of fracture patterns in layered slate[J]. International Journal of Fracture，2009，159(1)：51–62.
[7] TAVALLALI A，VERVOORT A. Effect of layer orientation on the failure of layered sandstone under Brazilian test conditions[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(2)：313–322.
[8] VERVOORT A，MIN K B，KONIETZKY H，et al. Failure of transversely isotropic rock under Brazilian test conditions[J]. International Journal of Rock Mechanics and Mining Sciences，2014，70：343–352.
[9] 许 多，张 茹，高明忠，等. 基于间接拉伸试验的煤岩层理效应研究[J]. 煤炭学报，2017，42(12)：3 133–3 141.(XU Duo，ZHANG Ru，GAO Mingzhong，et al. Research on coal bedding effect based on indirect tensile test[J]. Journal of China Coal Society，2017，42(12)：3 133–3 141.(in Chinese))
[10] WANG P，CAI M，REN F. Anisotropy and directionality of tensile behaviours of a jointed rock mass subjected to numerical Brazilian tests[J]. Tunnelling and Underground Space Technology，2018，73：139–153.
[11] 刘运思，傅鹤林，饶军应，等. 不同层理方位影响下板岩各向异性巴西圆盘劈裂试验研究[J]. 岩石力学与工程学报，2012，31(4)：785–791.(LIU Yunsi，FU Helin，RAO Junying，et al. Research on brazilian disc splitting tests for anisotropy of slate under influence of different bedding orientations[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(4)：785–791.(in Chinese))
[12] 刘运思，傅鹤林，伍毅敏，等. 基于单弱面理论对板岩巴西劈裂试验研究[J]. 煤炭学报，2013，38(10)：1 775–1 780.(LIU Yunsi，FU Helin，WU Yimin，et al. Study on Brazilian splitting test for slate based on single weak plane theory[J]. Journal of China Coal Society，2013，38(10)：1 775–1 780.(in Chinese))
[13] 喻 勇，王天雄. 三峡花岗岩劈裂抗拉特性与弹性模量关系的研究[J]. 岩石力学与工程学报，2004，23(19)：3 258–3 261.(YU Yong，WANG Tianxiong. Study on relationship between splitting behaviour and elastic modulus of Three Gorges granite[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(19)：3 258–3 261.(in Chinese))
[14] 宫凤强，李夕兵，ZHAO J. 巴西圆盘劈裂试验中拉伸模量的解析算法[J]. 岩石力学与工程学报，2010，29(5)：881–891.(GONG Fengqiang，LI Xibing，ZHAO J. Analytical algorithm to estimate tensile modulus in Brazilian disk splitting tests[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(5)：881–891.(in Chinese))
[15] QIU J，LI D，LI X. Dynamic failure of a phyllite with a low degree of metamorphism under impact Brazilian test[J]. International Journal of Rock Mechanics and Mining Sciences，2017，94：10–17.
[16] 李地元，邱加冬，李夕兵. 冲击载荷作用下层状砂岩动态拉压力学特性研究[J]. 岩石力学与工程学报，2015，34(10)：2 091–2 097.(LI Diyuan，QIU Jiadong，LI Xibing. Experimental study on dynamic tensile and compressive properties of bedding sandstone under impact loading[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(10)：2 091–2 097.(in Chinese))
[17] CHO J W，KIM H，JEON S，et al. Deformation and strength anisotropy of Asan gneiss，Boryeong shale，and Yeoncheon schist[J]. International Journal of Rock Mechanics and Mining Sciences，2012，50：158–169.
[18] GHOLAMI R，RASOULI V. Mechanical and elastic properties of transversely isotropic slate[J]. Rock Mechanics and Rock Engineering，2014，47(5)：1 763–1 773.
[19] 王慧文，李江腾，高吉超，等. 干燥及饱水状态下基于巴西劈裂法的板岩抗拉强度[J]. 中南大学学报：自然科学版，2017，48(4)：1 044–1 048.(WANG Huiwen，LI Jiangteng，GAO Jichao，et al. Tensile strength of slates under Brazilian splitting test in dry and saturated condition[J]. Journal of Central South University：Science and Technology，2017，48(4)：1 044–1 048.(in Chinese))
[20] MA T，PENG N，ZHU Z，et al. Brazilian tensile strength of anisotropic rocks：review and new insights[J]. Energies，2018，11(2)：304.
[21] TAN X，KONIETZKY H，FRÜHWIRT T，et al. Brazilian tests on transversely isotropic rocks：laboratory testing and numerical simulations[J]. Rock Mechanics and Rock Engineering，2015，48(4)：1 341–1 351.
[22] 谭 鑫，HEINZ Konietzky. 含层理构造的非均质片麻岩巴西劈裂试验及离散单元法数值模拟研究[J]. 岩石力学与工程学报，2014，33(5)：938–946.(TAN Xin，HEINZ Konietzky. Brazilian split tests and numerical simulation by discrete element method for heterogeneous gneiss with bedding structure[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(5)：938–946.(in Chinese))
[23] CAI M，KAISER P K. Numerical simulation of the Brazilian test and the tensile strength of anisotropic rocks and rocks with pre-existing cracks[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(3)：450–451.
[24] MA Y，HUANG H. DEM analysis of failure mechanisms in the intact Brazilian test[J]. International Journal of Rock Mechanics and Mining Sciences，2018，102：109–119.
[25] DUAN K，KWOK C Y. Discrete element modeling of anisotropic rock under Brazilian test conditions[J]. International Journal of Rock Mechanics and Mining Sciences，2015，78：46–56.
[26] CHONG Z，LI X，HOU P，et al. Numerical investigation of bedding plane parameters of transversely isotropic shale[J]. Rock Mechanics and Rock Engineering，2017，50(5)：1–22.
[27] DAN D Q，KONIETZKY H，HERBST M. Brazilian tensile strength tests on some anisotropic rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2013，58：1–7.
[28] 张晓平. 片状岩石变形破坏过程及强度特性研究——以丹巴二云英片岩为例[博士学位论文][D]. 北京：中国科学院地质与地球物理研究所，2010.(ZHANG Xiaoping. The strength and deformation of schistose rock——a case study of DanBa Quartz mica schist[Ph. D. Thesis][D]. Beijing：Institute of Geology and Geophysics，Chinese Academy of Sciences，2010.(in Chinese))
[29] ISRM. Suggested methods for determining tensile strength of rock materials[J]. International Journal of Rock Mechanics and Mining Science and Geomechanics Abstracts，1978，15(15)：99–103.
[30] CLAESSON J，BOHLOLI B. Brazilian test：stress field and tensile strength of anisotropic rocks using an analytical solution[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(8)：991–1 004.
[31] 陈子全，何 川，吴 迪，等. 深埋碳质千枚岩力学特性及其能量损伤演化机制[J]. 岩土力学，2018，39(2)：445–456.(CHEN Ziquan，HE Chuan，WU Di，et al. Mechanical properties and energy damage evolution mechanism of deep-buried carbonaceous phyllite[J]. Rock and Soil Mechanics，2018，39(2)：445–456.(in Chinese)) |
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2019, Vol. 38 
