|
|
|
| Fracturing behavior and failure pattern of sandstone in three-point bending test under freezing-thawing cycles |
| HE Jingjing，SHI Junping |
| (Civil Engineering and Architecture College，Xi?an University of Technology，Xi?an，Shaanxi 710048，China) |
|
|
|
|
Abstract Three-point bending test on sandstone with different initial crack-depth ratios was carried out under different freezing-thawing cycles. The variation of the three-dimensional shape of the failure surface of specimens under the cyclic freezing-thawing was analyzed，and the relationships between the roughness coefficient and the initial load of fracture，peak load，fracture toughness and fracture energy were explored. The results show that the cyclic freezing-thawing reduces the values of initial load of fracture，peak load，fracture toughness and fracture energy of sandstone specimens to various extent and the extent of reduction is affected by the initial crack-depth ratio. The roughness coefficient of the failure surface of specimens increase with increasing freezing-thawing cycles and initial crack-depth ratio. When the initial crack-depth ratio is fixed，the relationship between the roughness coefficient and the freeze-thaw cycles is an exponential function. Under the effect of cyclic freezing-thawing，the damage factors of the peak load and the fracture toughness increase linearly with the increment of roughness coefficient.
|
|
|
|
|
|
[1] 张慧梅，杨更社. 冻融荷载耦合作用下岩石损伤力学特性[J]. 工程力学，2011，28(5)：161–165.(ZHANG Huimei，YANG Gengshe. Damage mechanical characteristics of rock under freeze-thaw and load coupling[J]. Engineering Mechanics，2011，28(5)：161–165.(in Chinese))
[2] ARGANDOÑA V G R D，REY A R，CELORIO C，et al. Characterization by computed X-ray tomography of the evolution of the pore structure of a dolomite rock during freeze-thaw cyclic tests[J]. Physics and Chemistry of the Earth Part A Solid Earth & Geodesy，1999，24(7)：633–637.
[3] NICHOLSON D T，NICHOLSON F H. Physical deterioration of sedimentary rocks subjected to experimental freeze–thaw weathering[J]. Earth Surface Processes and Landforms，2000，25(12)：1 295–1 307.
[4] WORSTER M G，WETTLAUFER J S. Premelting dynamics[J]. Annual Review of Fluid Mechanics，2006，38(1)：427–452.
[5] MUTLUTÜRK M，ALTINDAG R，TÜRK G. A decay function model for the integrity loss of rock when subjected to recurrent cycles of freezing-thawing and heating-cooling[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(2)：237–244.
[6] TAN X，CHEN W，YANG J，et al. Laboratory investigations on the mechanical properties degradation of granite under freeze-thaw cycles[J]. Cold Regions Science and Technology，2011，68(3)：130–138.
[7] MARTÍNEZ-MARTÍNEZ J，BENAVENTE D，GOMEZ-HERAS M，et al. Nonlinear decay of building stones during freeze-thaw weathering processes[J]. Construction and Building Materials，2013，38(1)：443–454.
[8] VLAHOU I，WORSTER M G. Ice growth in a spherical cavity of a porous medium[J]. Journal of Glaciology，2010，56(196)：271–277.
[9] 张慧梅，杨更社. 冻融与荷载耦合作用下岩石损伤模型的研究[J]. 岩石力学与工程学报，2010，29(3)：471–476.(ZHANG Huimei，YANG Gengshe. Research on damage model of rock under coupling action of freeze-thaw and load[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(3)：471–476.(in Chinese))
[10] 贾海梁，项 伟，申艳军，等. 冻融循环作用下岩石疲劳损伤计算中关键问题的讨论[J]. 岩石力学与工程学报，2017，36(2)：335–346.(JIA Hailiang，XIANG Wei，SHEN Yanjun，et al. Discussion of the key issues within calculation of the fatigue damage of rocks subjected to freeze-thaw cycles[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(2)：335–346.(in Chinese))
[11] 李新平，路亚妮，王仰君. 冻融荷载耦合作用下单裂隙岩体损伤模型研究[J]. 岩石力学与工程学报，2013，32(11)：2 307–2 315.(LI Xinping，LU Yani，WENG Yangjun. Research on damage model of single jointed rock masses under coupling action of freeze-thaw and loading[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(11)：2 307–2 315.(in Chinese))
[12] 周科平，李杰林，许玉娟，等. 冻融循环条件下岩石核磁共振特性的试验研究[J]. 岩石力学与工程学报，2012，31(4)：731–737.(ZHOU Keping，LI Jielin，XU Yujuan，et al. Experimental study of NMR characteristics in rock under freezing and thawing cycles[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(4)：731–737.(in Chinese))
[13] 刘泉声，黄诗冰，康永水，等. 岩体冻融疲劳损伤模型与评价指标研究[J]. 岩石力学与工程学报，2015，34(6)：1 116–1 127.(LIU Quansheng，HUANG Shibing，KANG Yongshui，et al. Fatigue damage model and evaluation index for rock mass under freezing- thawing cycles[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(6)：1 116–1 127.(in Chinese))
[14] CICCOTTI M，GONZATO G，MULARGIA F. The double torsion loading configuration for fracture propagation：an improved methodology for the load-relaxation at constant displacement[J]. International Journal of Rock Mechanics and Mining Sciences，2000，37(7)：1 103–1 113.
[15] CUI Z D，LIU D A，AN G M，et al. A comparison of two ISRM suggested chevron notched specimens for testing mode-I rock fracture toughness[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(5)：871–876.
[16] AYATOLLAHI M R，ALIHA M R M. Fracture toughness study for a brittle rock subjected to mixed mode I/II loading[J]. International Journal of Rock Mechanics and Mining Sciences，2007，44(4)：617–624.
[17] ERARSLAN N，WILLIAMS D J. The damage mechanism of rock fatigue and its relationship to the fracture toughness of rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2012，56(56)：15–26.
[18] 李晓东，董 伟，吴智敏，等. 小尺寸混凝土试件双K断裂参数试验研究[J]. 工程力学，2010，27(2)：166–171.(LI Xiaodong，DONG Wei，WU Zhimin，et al. Experimental investigation on double-K fracture parameters for small size specimens of concrete[J]. Engineering Mechanics，2010，27(2)：166–171.(in Chinese))
[19] 左建平，黄亚明，刘连峰. 含偏置缺口玄武岩原位三点弯曲细观断裂研究[J]. 岩石力学与工程学报，2013，32(4)：740–746.(ZUO Jianping，HUANG Yaming，LIU Lianfeng. Investigation on meso-fracture mechanism of basalt with offset notch based on in-situ three-point bending tests[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(4)：740–746.(in Chinese))
[20] XU S，REINHARDT H W. Determination of double-determination of double-k criterion for crack propagation in quasi-brittle fracture part i：experimental investigation of crack propagation[J]. International Journal of Fracture，1999，98(2)：111–149.
[21] XU S，REINHARDT H W. Determination of double-K，criterion for crack propagation in quasi-brittle fracture，Part II：Analytical evaluating and practical measuring methods for three-point bending notched beams[J]. International Journal of Fracture，1999，98(2)：151–177.
[22] XU S，REINHARDT H W. Determination of double-K，criterion for crack propagation in quasi-brittle fracture，Part III：Compact tension specimens and wedge splitting specimens[J]. International Journal of Fracture，1999，98(2)：179–193.
[23] 华 文，董世明，徐积刚. 复合型加载条件下锈岩断裂韧度试验研究[J]. 岩土力学，2016，37(3)：753–758.(HUA Wen，DONG Shengming，XU Jigang. Experimental study on the fracture toughness of rust stone under mixed mode loading condition[J]. Material Research Innovations，2016，37(3)：753–758.(in Chinese))
[24] 左建平，谢和平，刘瑜杰，等. 不同温度热处理后砂岩三点弯曲的断裂特性[J]. 固体力学学报，2010，31(2)：119–126.(ZUO Jianping，XIE Heping，LIU Yujie，et al. Investigation on fracture characteristics of sandstone after thermal effects through three-bending point experiments[J]. Chinese Journal of Solid Mechanics，2010，31(2)：119–126.(in Chinese))
[25] MANNING J M，LEE C K，CERAMI A，et al. Draft recommendation：Determination of the fracture energy of mortar and concrete by means of three-point bend tests on notched beams[J]. Materials and Structures，1985，18(6)：484.
[26] 朱珍德，徐卫亚，张爱军. 脆性岩石损伤断裂机制分析与试验研究[J]. 岩石力学与工程学报，2003，22(9)：1 411–1 416.(ZHU Zhende，XU Wenya，ZHANG Aijun. Mechanism analysis and testing study on damage and fracture of brittle rock[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(9)：1 411–1 416.(in Chinese))
[27] 谢和平，高 峰，周宏伟，等. 岩石断裂和破碎的分形研究[J]. 防灾减灾工程学报，2003，23(4)：1–9.(XIE Heping，GAO Feng，ZHOU Hongwei，et al. Fractal fracture and fragmentation in rocks[J]. Journal of Seismology，2003，23(4)：1–9.(in Chinese))
[28] EL-SOUDANI S M. Profilometric analysis of fractures[J]. Metallography，1978，11(3)：247–33 |
|
|
|
2017, Vol. 36 
