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高烈度下双裂缝主控结构面危岩的断裂破坏机制分析

唐红梅 周福川 陈松 王林峰

唐红梅, 周福川, 陈松, 王林峰. 高烈度下双裂缝主控结构面危岩的断裂破坏机制分析[J]. 应用数学和力学, 2021, 42(6): 645-655. doi: 10.21656/1000-0887.410187
引用本文: 唐红梅, 周福川, 陈松, 王林峰. 高烈度下双裂缝主控结构面危岩的断裂破坏机制分析[J]. 应用数学和力学, 2021, 42(6): 645-655. doi: 10.21656/1000-0887.410187
TANG Hongmei, ZHOU Fuchuan, CHEN Song, WANG Linfeng. Fracture Mechanism of Unstable Rock With Double-Crack Control Discontinuity Subjected to High Earthquake Intensities[J]. Applied Mathematics and Mechanics, 2021, 42(6): 645-655. doi: 10.21656/1000-0887.410187
Citation: TANG Hongmei, ZHOU Fuchuan, CHEN Song, WANG Linfeng. Fracture Mechanism of Unstable Rock With Double-Crack Control Discontinuity Subjected to High Earthquake Intensities[J]. Applied Mathematics and Mechanics, 2021, 42(6): 645-655. doi: 10.21656/1000-0887.410187

高烈度下双裂缝主控结构面危岩的断裂破坏机制分析

doi: 10.21656/1000-0887.410187
基金项目: 

国家自然科学基金(51378521

51678097)

详细信息
    作者简介:

    唐红梅(1968—),女,研究员,博士生导师(通讯作者. E-mail: hmtang6778@sina.com).

    通讯作者:

    唐红梅(1968—),女,研究员,博士生导师(通讯作者. E-mail: hmtang6778@sina.com).

  • 中图分类号: TU43

Fracture Mechanism of Unstable Rock With Double-Crack Control Discontinuity Subjected to High Earthquake Intensities

Funds: 

The National Natural Science Foundation of China(51378521

51678097)

  • 摘要: 灰岩地区危岩具有典型类砌体结构特征,结构面发育复杂,其破坏本质是主控结构面在荷载作用下的断裂扩展失稳问题.基于地貌演化分析了灰岩地带陡崖复杂结构面形成与演化,获得了双裂缝主控结构面危岩的地质模型.构建了此类危岩的力学模型和断裂力学模型,按照最大周向应力准则,基于危岩自重、裂隙水压力及地震荷载作用,构建了双裂缝主控结构面危岩的断裂稳定系数表达式.通过案例分析验证了其合理性;各烈度对应的断裂稳定系数随贯通度增加而下降,基本地震烈度为Ⅷ度和Ⅸ度时,危岩处于不稳定状态;危岩稳定性受到主控结构面的裂隙贯通度与地震诱发的耦合作用影响,临界失稳贯通度随地震烈度的提高而降低;Ⅶ度地震的临界失稳贯通度理论值为25.8%,略小于贯通度实际值27.7%,略偏安全,其建立的断裂稳定系数表达式具有较好的适用性.研究结果可为推动此类危岩合理化防治提供重要的理论支撑.
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出版历程
  • 收稿日期:  2020-06-19
  • 修回日期:  2020-10-13

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