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Sensitivity Analysis of Factors Affecting Time-Dependent Slope Stability under Freeze-Thaw Cycles

机译：冻融循环作用下时变边坡稳定性影响因素的敏感性分析

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摘要

With open-pit mines excavated, the slopes will be exposed to the natural environment for a long time. Affected by factors like temperature, seepage, mining, freeze-thaw, etc., slope structural integrity and strength will gradually decline as slope exposure time extends. Besides, the development of defect structure within the rocks is closely correlated with time. In this paper, freeze-thaw cycle tests were conducted on the saturated sandstones collected from a certain open-pit mine. According to the test results, the mass density and longitudinal wave velocity gradually increased with more times of freeze-thaw cycles while mechanical properties such as internal friction angle, cohesion, elastic modulus, and uniaxial compressive strength decreased instead. The constitutive model of saturated rock deterioration was established by taking the volume of phase transition of water in microcracks as a variable. Based on the tests results and theoretical analysis, the sensitivity of the factors affecting slope stability under freeze-thaw damage was studied by Control Variable Method (CVM) and Orthogonal Design Method (ODM). It was determined that the internal friction angle and cohesion had a highly significant effect on the test results, while the mass density had a significant effect. The conclusions may play a certain role in guiding slope construction and protection.
机译：开挖露天矿山后，这些山坡将长时间暴露在自然环境中。受温度，渗流，采矿，冻融等因素的影响，随着边坡暴露时间的延长，边坡结构的完整性和强度将逐渐下降。此外，岩石内部缺陷结构的发展与时间密切相关。本文对从某露天矿采集的饱和砂岩进行了冻融循环试验。根据试验结果，随着冻融循环次数的增加，质量密度和纵波速度逐渐增加，而内摩擦角，内聚力，弹性模量和单轴抗压强度等机械性能却下降。以微裂纹中水的相变体积为变量，建立了饱和岩石劣化的本构模型。根据试验结果和理论分析，采用控制变量法（CVM）和正交设计法（ODM）研究了冻融破坏作用下边坡稳定性影响因素的敏感性。可以确定，内摩擦角和内聚力对测试结果具有非常显着的影响，而质量密度则具有显着的影响。结论对指导边坡建设与防护具有一定的指导意义。

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  • 来源
    《Mathematical Problems in Engineering》 |2018年第6期|7431465.1-7431465.10|共10页
  • 作者

    Chang Zhiguo; Cai Qingxiang; Ma Li; Han Liu;

  • 作者单位

    China Univ Min & Technol, Sch Mines, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Sch Mines, Xuzhou 221116, Jiangsu, Peoples R China;

    Liaoning Tech Univ, Res Ctr Coal Resources Safe Mining & Clean Utiliz, Fuxing 123000, Liaoning, Peoples R China;

    China Univ Min & Technol, Sch Mines, Xuzhou 221116, Jiangsu, Peoples R China;

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