| 循环冻融条件下节理岩体损伤破坏试验研究 |
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| 引用本文： | 刘红岩,刘冶,邢闯锋,张力民,马敏.循环冻融条件下节理岩体损伤破坏试验研究[J].岩土力学,2014,35(6):1547-1554. |
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| 作者姓名： | 刘红岩 刘冶 邢闯锋 张力民 马敏 |
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| 作者单位： | 1.中国地质大学（北京）工程技术学院，北京 100083；2.西藏大学 工学院，拉萨 850000； 3.北京科技大学 土木工程与环境学院，北京100083；4.河北承德钢铁公司，河北 承德067000 |
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| 基金项目： | 国家自然科学基金项目（No. 41002113；No. 41162009）；教育部科学技术研究重点项目（No. 211175）；西藏大学国家大学生创新计划项目（No. 1069411048）。 |
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| 摘 要： | 通过循环冻融和相似材料试验，研究了节理岩体在冻融条件下的损伤破坏机制及其相应的力学特性。通过对经历冻融循环后的试件损伤破坏模式的观察和单轴压缩试验，重点研究了节理倾角、节理贯通度、节理条数、节理充填物厚度、节理充填物类型、试件饱和度、冻融循环次数等对试件冻融损伤破坏模式、单轴抗压强度和弹性模量的影响。研究发现：节理存在及其物理力学性质对岩体的冻融损伤破坏模式及强度均有很大影响。节理倾角通过影响冻融裂纹的起裂位置进而影响其破坏模式和强度；随着贯通度的增加，试件表面裂纹由稀变密；随着节理条数增加，试件受冻融影响明显加剧；随着节理充填物厚度增加，试件冻融损伤程度先增加后减小；节理充填物类型对试件冻融损伤程度也有一定影响；随着试件饱和度的增加，试件冻融损伤程度先减小后增加；随着冻融循环次数的增加，节理试件表面因冻胀引起的裂纹逐渐增多、变宽，且其抗冻融特性较完整试件差。上述研究成果对寒区岩体工程建设及安全运营具有重要的参考价值。
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| 关 键 词： | 循环冻融 节理岩体 损伤 单轴抗压强度 弹性模量 破坏模式 |
| 收稿时间： | 2013-03-05 |
Test study of damage failure of jointed rock mass under freezing-thawing cycles |
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| LIU Hong-yan,LIU Ye,XING Chuang-feng,ZHANG Li-min,MA Min.Test study of damage failure of jointed rock mass under freezing-thawing cycles[J].Rock and Soil Mechanics,2014,35(6):1547-1554. |
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| Authors: | LIU Hong-yan LIU Ye XING Chuang-feng ZHANG Li-min MA Min |
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| Institution: | 1. School of Engineering & Technology, China University of Geoseiences (Beijing), Beijing 100083, China；2. School of Engineering, Tibet University, Lasha 850000, China；3. School of Civil and Environmental Engineering, Beijing University of Science and Technology, Beijing 100083, China； 4. Hebei Chengde Iron and Steel Corporation, Chengde, Hebei 067000, China |
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| Abstract: | The damage failure mechanism and mechanical characteristics of jointed rock mass have been studied through freezing- thawing cycles and similar material test method. Through the observation of the damage failure modes and uniaxial compression test of the samples after freezing-thawing cycles, the effects of joint dip angle, joint continuity degree, joint set, joint filling depth, sort of joint filling, sample’s saturation degree and number of cycles on the damage failure mode, uniaixal compression strength and elastic modulus are studied. It is shown that the existence of joint and its physico-mechanical properties have much effect on the damage failure modes and strength. The joint dip angle affects the failure modes and strength by affecting the occurrence position of freezing-thawing cracks. The cracks become more with joint continuity degree. The effect of freezing-thawing on the samples becomes worse with number of joints. The freezing-thawing damage degree first increases then decreases with joint filling depth. The sort of joint filling has certain effect on the freezing-thawing damage degree. The freezing-thawing damage degree first decreases then increases with the sample’s saturation degree. The cracks become more and wider with the number of cycles; and its anti-freezing-thawing property is worse than that of the intact one. The above research conclusions can provide valuable references to the constructions and safety operation of rock mass projects in cold regions. |
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| Keywords: | freezing-thawing cycle jointed rock mass damage uniaxial compression strength elastic modulus failure mode |
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