多级时效荷载下双裂隙砂岩变形与破裂特征试验研究

doi:10.13722/j.cnki.jrme.2016.1508

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摘要实际工程中，岩体在进入最终应力状态前会经历多级时效荷载的作用。为研究该荷载下裂隙岩体强度、裂纹扩展和变形特征等的变化规律，以通过对砂岩切割并充填水泥砂浆制备的裂隙试样为对象，开展多级时效荷载下的三轴压缩试验。试验结果表明：多级时效荷载下，3种不同裂隙组合试样的强度较常规压缩均有一定程度的降低，陡缓和陡陡裂隙岩体的强度均在起裂强度?ci和扩容应力?cd之间。裂纹扩展特征方面，在相同应力路径下，随着围压的增大，裂隙岩体的破坏呈现更强的剪切性质；缓缓裂隙组合岩体的破坏形式主要受裂隙本身的分布形态所控制，受应力水平和加载路径的影响较小，在试验中均以裂隙岩桥直接贯通发生破坏；相同围压条件下，陡缓和陡陡裂隙组合岩体在时效荷载作用下的破坏较常规压缩下的破坏表现出更强的张拉性质。利用Burgers蠕变损伤模型分析各岩体间的关系，指出岩体间变形的差异主要由裂隙特征导致的初始损伤差别和岩体处于不同强度区间而导致的不同时效损伤引起，为建立岩体时效损伤模型的进一步研究提供了参考。

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	杨超1
	冯振华1
	王鑫1
	黄达2

关键词 ：岩石力学, 双裂隙砂岩, 多级时效荷载作用, 裂纹扩展, 时效损伤模型

Abstract：Rocks in engineering projects experience usually the multistage time-dependent loading before reaching the final stress state. The triaxial compression experiments in laboratory were performed in order to investigate the effect of multistage time-dependent loading on the strength failure and crack coalescence behavior. The tests results showed that all the strengths of sandstone samples with three types of preexisting closed flaw pairs respectively under the multistage time-dependent loading decreased to some extent compared with those under conventional triaxial compression tests. For the type of specimens with high-low angle and high-high angle，the values of the strength under the multistage time-dependent loading were between the initiation stress level ?ci and the critical stress of dilation ?cd. Under the same stress loading path，the fractured rock showed the strong characteristics of shear failure with the increase of confining pressure. All of the low-low angle type of specimens showed the mode of rock bridge failure，indicating that the failure mode of the low-low angle type of specimens is mainly controlled by the distribution of the fracture itself，the influence of stress level and loading path is small. Under the multistage time-dependent loading，the failure of high-low angle and high-high angle type of specimens showed the mode of tensile failure. Burgers model for damage creep was used to analyze the relationship of these rock masses.

Key words： rock mechanics sandstone containing two pre-existing fissures multistage time-dependent loading crack coalescence time dependent damage model

引用本文:

杨超1，冯振华1，王鑫1，黄达2. 多级时效荷载下双裂隙砂岩变形与破裂特征试验研究[J]. 岩石力学与工程学报, 2017, 36(9): 2092-2101.
YANG Chao1，FENG Zhenhua1，WANG Xin1，HUANG Da2. Experimental research on deformation and crack coalescence properties of sandstone containing two pre-existing fissures under multistage time-dependent loading. , 2017, 36(9): 2092-2101.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2016.1508 或 http://www.rockmech.org/CN/Y2017/V36/I9/2092

[7]	LI X，KONIETZKY H. Numerical simulation schemes for time-dependent crack growth in hard brittle rock[J]. Acta Geotechnica，2014，DOI：10.1007/s11440-014-0337-9. " target="_blank">
[11]	HUANG D，GU D，YANG C，et al. Investigation on mechanical behaviors of sandstone with two preexisting flaws under triaxial compression[J]. Rock Mechanics and Rock Engineering，2016，49(2)：375-399. " target="_blank">
[1]	李永盛. 单轴压缩条件下四种岩石的蠕变和松弛试验研究[J]. 岩石力学与工程学报，1995，14(1)：39-47.(LI Yongsheng. Creep and relaxation of 4 kinds of rock under uniaxial compression[J]. Chinese Journal of Rook Mechanics and Engineering，1995，14(1)：39-47.(in Chinese))
[5]	邓广哲，朱维申. 蠕变裂隙扩展与岩石长时强度效应实验研究[J]. 实验力学，2002，17(2)：178-183.(DENG Guangzhe，ZHU Weishen. An Experiment research on the crack propagation in rockmass[J]. Journal of Experimental Mechanics，2002，17(2)：178-183.(in Chinese))
[14]	徐鹏，杨圣奇. 循环加卸载下煤的黏弹性蠕变本构关系研究[J]. 岩石力学与工程学报，2015，34(3)：537-545.(XU Peng，YANG Shengqi. Study of voscp-elastic-plastic constitutive model of coal under cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(3)：537-545.(in Chinese))
[9]	HUANG D，CEN D F，MA G W，et al. Step-path failure of rock slopes with intermittent joints[J]. Landslides，DOI：10.1007/ s10346-014-014-0517-6. " target="_blank">
[6]	赵延林，万文，王卫军，等. 类岩石裂纹压剪流变断裂与亚临界扩展实验及破坏机制[J]. 岩土工程学报，2012，34(6)：1 050-1 059. (ZHAO Yanlin，WAN Wen，WANG Weijun，et al. Compressive-shear rheological fracture of rock-like cracks and subcritical crack propagation test and fracture mechanism[J]. Chinese Journal of Geotechnical Engineering，2012，34(6)：1 050-1 059.(in Chinese))
[15]	赵延林，唐劲舟，付成成，等. 岩石黏弹塑性应变分离的流变试验与蠕变损伤模型[J]. 岩石力学与工程学报，2016，35(7)：1 297-1 308. (ZHAO Yanlin，TANG Jinzhou，FU Chengcheng，et al. Rheological test of separation between viscoelactic-plastic strains and creep damage model[J]. Chinese Journal of Rock Mechanics and Engineering， 2016，35(7)：1 297-1 308.(in Chinese))
[4]	黄润秋，黄达，段绍辉，等. 锦屏I级水电站地下厂房施工期围岩变形开裂特征及地质力学机制研究[J]. 岩石力学与工程学报，2011，30(1)：23-35.(HUANG Runqiu，HUANG Da，DUAN Shaohui，et al. Geomechanics mechanism and characteristics of surrounding rock mass deformation failure in construction phase for underground powerhouse of Jinping I hydropower station[J]. Chinese Journal of Rook Mechanics and Engineering，2011，30(1)：23-35.(in Chinese))
[8]	黄达，杨超，黄润秋，等. 分级卸荷量对大理岩三轴卸荷蠕变特性影响规律试验研究[J]. 岩石力学与工程学报，2015，34(增1)：2 801-2 807.(HUANG Da，YANG Chao，HUANG Runqiu，et al. Experimental research of unloading triaxial rheological characteristics of marble affected by different step unloading values[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(Supp.1)： 2 801-2 807.(in Chinese))
[13]	朱维申，齐银萍，郭运华，等. 锦屏I级水电站地下厂房围岩变形破裂的三维损伤流变分析[J]. 岩石力学与工程学报，2012，31(5)：865-872.(ZHU Weishen，QI Yinping，GUO Yunhua，et al. 3D damage rheology analysis of deformation and fracture of surrounding rocks in Jinping I hydropower station underground powerhouse[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(5)：865-872.(in Chinese))
[2]	杨超. 硬质裂隙岩体三轴加载及卸荷蠕变特性研究[博士学位论文][D]. 重庆：重庆大学，2015.(YANG Chao. Study on the triaxial loading and unloading creep properties of fractured hard rock[Ph. D. Thesis][D]. Chongqing：Chongqing University，2015.(in Chinese)) " target="_blank">
[3]	陈德基，余永志，马能武，等. 三峡工程永久船闸高边坡稳定性研究中的几个主要问题[J]. 工程地质学报，2000，8(1)：7-15.(CHEN Deji，YU Yongzhi，MA Nengwu，et al. Some main problems on the stability of high permanent shiplock slope for three-gorges project[J]. Journal of Engineering Geology，2000，8(1)：7-15.(in Chinese))
[10]	杨超，黄达，黄润秋，等. 断续双裂隙砂岩三轴卸荷蠕变特性试验及损伤蠕变模型[J]. 煤炭学报，2016，41(9)：2 203-2 211. (YANG Chao，HUANG Da，HUANG Runqiu，et al. Experimental research on the triaxial unloading creep characteristics of stone with two pre-existing cracks and its damage creep model[J]. Journal of China Coal Society，2016，41(9)：2 203-2 211.(in Chinese))
[12]	闫子舰，夏才初，李宏哲，等. 分级卸荷条件下锦屏大理岩流变规律研究[J]. 岩石力学与工程学报，2008，27(10)：2 153-2 159.(YAN Zijian，XIA Caichu，LI Hongzhe，et al. Study on rheological rules of marble in Jinping Hydropower Station under conditions of step unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(10)：2 153-2 159.(in Chinese))