含多裂隙岩体裂隙扩展与贯通的室内试验研究
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摘要
采用石膏配制类岩石材料,制作了含五裂隙的中尺寸试件进行室内单轴压缩试验。采用PMLABDIC-3D系统进行试验过程的图像采集和试验后的数据分析,对最终裂隙扩展形式、裂隙宽度及起裂应力等方面开展研究,探讨了含多裂隙岩体在单轴加载条件下预制裂隙扩展和贯通规律。结果表明:所有试件在破坏时均产生主裂隙;预制裂隙的存在对新生裂隙的生成条件、宽度以及分布有很大的影响;虽然新生裂隙产生的先后次序规律并不明显,但是开裂荷载与对应峰值荷载的比值随着预制裂隙角度的增加而呈现出先增大后减小的趋势。
Uniaxial compression tests were conducted on medium-sized artificial rock samples made from gypsum according to a selected mixing ratio. A PMLAB DIC-3D system was used to collect the images during the tests and process the data post the tests.The mechanism of propagation and coalescence of the pre-exist fractures under uniaxial compression is studied considering the final cracking patterns, crack width and crack initiation stress. It is shown that for all the testing specimens dominant cracks appeared when the failure occurred. The presence of the pre-exist cracks has significant influences on the generation condition, width and distribution of new cracks. Although the generation of the new fractures may not follow an obvious sequential order, the ratio between the crack initiation load and the peak load firstly increases and then decreases with the increasing angle of the pre-exist cracks.
Uniaxial compression tests were conducted on medium-sized artificial rock samples made from gypsum according to a selected mixing ratio. A PMLAB DIC-3D system was used to collect the images during the tests and process the data post the tests.The mechanism of propagation and coalescence of the pre-exist fractures under uniaxial compression is studied considering the final cracking patterns, crack width and crack initiation stress. It is shown that for all the testing specimens dominant cracks appeared when the failure occurred. The presence of the pre-exist cracks has significant influences on the generation condition, width and distribution of new cracks. Although the generation of the new fractures may not follow an obvious sequential order, the ratio between the crack initiation load and the peak load firstly increases and then decreases with the increasing angle of the pre-exist cracks.
引文
A. Bobet andⅡ.Ⅱ. Einstein. 1998. Fracture Coalescence in Rock-type Materials under Lniaxial and Biaxial Compression[J]. International Journal of Fracture, 35(7):863-888.
C.Ⅱ. Park, A. Bobet. 2009. Crack coalescence in specimens with open and closed flaws:A comparison[J]. international Journal of Rock Mechanics&Mining Sciences,(46):819-829.
C.Ⅱ. Park, A. Bobet. 2010. Crack initiation, propagation and coalescence from frictional flaws in uniaxial compression[J]. Engineering Fracture Mechanics,(77):2727-2748.
K. Duan, C. Y. Kwok. 2015. Discrete element modeling of anisotropic rock under Brazilian test conditions[J]. Internatioal Journal of Rock Mechanics&Mining Sciences,78:46-56.
M. Prudencio, M.,Mn Sint Jan. 2007. Strength and failure muodes of rock mass models with non-persistent joints[J]. international Journal of Rock Mechanics and Mining Science, 44:890-902.
付金伟,朱维申,谢富东等.2013.岩石中三维双裂隙组扩展和贯通过程的实验研究和弹脆性模拟[J].岩土力学,34(9):2489-2495.
高彦萍,吴国振.2006.用石膏模型制作耐磨备件的可行性研究[J].甘肃冶金,28(3):40-42.
何森林,黄昕,张子新.2016.石膏试件的力学特性研究[J].地下空间与工程学报,(z1):49-55.
罗西锋,邱变变.2007.产品设计中的石膏模型制作技术研究[J].包装工程,28(10):194-196.
吴莉.2002.缓凝剂对建筑石膏性能的影响和作用机理研究[D].重庆:重庆大学.
夏强,蒋林华,仲超,等.2011.硼砂对脱硫建筑石膏水化的影响及其机理分析[J].新型建筑材料,38(10):5-8.
杨圣奇,黄彦华,刘相如.2014.断续双裂隙岩石抗拉强度与裂纹扩展颗粒流分析[J].中国矿业大学学报,43(2):220-226.
杨圣奇.2013.断续三裂隙砂岩强度破坏和裂隙扩展特征研究[J].岩土力学,34(1):32-39.
C.Ⅱ. Park, A. Bobet. 2009. Crack coalescence in specimens with open and closed flaws:A comparison[J]. international Journal of Rock Mechanics&Mining Sciences,(46):819-829.
C.Ⅱ. Park, A. Bobet. 2010. Crack initiation, propagation and coalescence from frictional flaws in uniaxial compression[J]. Engineering Fracture Mechanics,(77):2727-2748.
K. Duan, C. Y. Kwok. 2015. Discrete element modeling of anisotropic rock under Brazilian test conditions[J]. Internatioal Journal of Rock Mechanics&Mining Sciences,78:46-56.
M. Prudencio, M.,Mn Sint Jan. 2007. Strength and failure muodes of rock mass models with non-persistent joints[J]. international Journal of Rock Mechanics and Mining Science, 44:890-902.
付金伟,朱维申,谢富东等.2013.岩石中三维双裂隙组扩展和贯通过程的实验研究和弹脆性模拟[J].岩土力学,34(9):2489-2495.
高彦萍,吴国振.2006.用石膏模型制作耐磨备件的可行性研究[J].甘肃冶金,28(3):40-42.
何森林,黄昕,张子新.2016.石膏试件的力学特性研究[J].地下空间与工程学报,(z1):49-55.
罗西锋,邱变变.2007.产品设计中的石膏模型制作技术研究[J].包装工程,28(10):194-196.
吴莉.2002.缓凝剂对建筑石膏性能的影响和作用机理研究[D].重庆:重庆大学.
夏强,蒋林华,仲超,等.2011.硼砂对脱硫建筑石膏水化的影响及其机理分析[J].新型建筑材料,38(10):5-8.
杨圣奇,黄彦华,刘相如.2014.断续双裂隙岩石抗拉强度与裂纹扩展颗粒流分析[J].中国矿业大学学报,43(2):220-226.
杨圣奇.2013.断续三裂隙砂岩强度破坏和裂隙扩展特征研究[J].岩土力学,34(1):32-39.