| 层状白云岩破裂演化机制及力学特性研究 |
| Study on the Fracture Evolution Mechanism and Mechanical Properties of Layered Dolomite |
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| 中文关键词:层状白云岩 非匀质性 破裂机制 力学特性 层理组数 层理倾角 |
| 英文关键词:layered dolomite heterogeneity fracture mechanism mechanical properties number of bedding groups bedding dip angle |
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| 中文摘要: |
| 为了研究层状岩体的非均质性和破裂演化特性，开展了不同层理组数、层理倾角下白云岩的单轴试验，并分析了试样的变形历程及破坏模式。研究结果表明：层理岩样会经历裂隙萌生 发育 扩张 最终破坏的演化历程，随着层理组数的增加，试件总加载时长减少，但宏观破裂历程更长，局部衍生多条张拉剪切裂隙，破坏特征更复杂；相较之下，完整白云岩总加载历程长，岩石强度大，但宏观破裂历程短，试件破碎彻底，脆性破坏特征明显。水平层状白云岩和竖向层状白云岩主要发生多裂隙诱导的张拉剪切复合破坏；30°倾角层状白云岩存在两种破坏模式，当层理组数较少时、以层理面的剪切滑移破坏为主，当层理组数较多时、以矿物基质张拉和层理面剪切滑移的复合破坏为主；60°倾角层状白云岩主要以层理面滑移剪切破坏为主。白云岩单轴强度、弹性模量随层理倾角呈“U”型变化，随层理组数增加逐渐降低。 |
| 英文摘要: |
| To investigate the heterogeneity and fracture evolution characteristics of layered rock masses, uniaxial tests were conducted on dolomite with varying numbers of bedding groups and bedding dip angles, and the deformation processes and failure modes of the samples were analyzed. The results show that layered rock samples undergo an evolution process of crack initiation, development, propagation, and ultimate failure. As the number of bedding groups increases, the total loading time of the specimens decreases, but the macroscopic fracture process becomes longer, with multiple tensile shear cracks locally developing, leading to more complex failure characteristics. In contrast, intact dolomite exhibits a longer total loading duration and higher rock strength but a shorter macroscopic fracture process, with complete fragmentation and pronounced brittle failure characteristics. Horizontal and vertical layered dolomite primarily exhibit composite tensile shear failure induced by multiple cracks. Layered dolomite with a 30° dip angle shows two failure modes: with fewer bedding groups, shear slip failure along the bedding plane dominates; with more bedding groups, a composite failure of mineral matrix tension and bedding plane shear slip becomes dominant. Layered dolomite with a 60° dip angle primarily undergoes bedding plane slip shear failure. The uniaxial strength and elastic modulus of dolomite exhibit a 'U' shape variation with bedding dip angle and decrease gradually with an increasing number of bedding groups. |
| 张彪.层状白云岩破裂演化机制及力学特性研究[J].国防交通工程与技术,2024,22(6):12~19,34 |
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