罗小杰, 罗程. 2016: 泥流型岩溶地面塌陷物理模型. 工程地质学报, 24(s1): 1054-1059. DOI: 10.13544/j.cnki.jeg.2016.s1.152
    引用本文: 罗小杰, 罗程. 2016: 泥流型岩溶地面塌陷物理模型. 工程地质学报, 24(s1): 1054-1059. DOI: 10.13544/j.cnki.jeg.2016.s1.152
    LUO Xiaojie, LUO Cheng. 2016: PHYSICAL MODEL OF MUD-FLOW TYPE KARST GROUND COLLAPSE. JOURNAL OF ENGINEERING GEOLOGY, 24(s1): 1054-1059. DOI: 10.13544/j.cnki.jeg.2016.s1.152
    Citation: LUO Xiaojie, LUO Cheng. 2016: PHYSICAL MODEL OF MUD-FLOW TYPE KARST GROUND COLLAPSE. JOURNAL OF ENGINEERING GEOLOGY, 24(s1): 1054-1059. DOI: 10.13544/j.cnki.jeg.2016.s1.152

    泥流型岩溶地面塌陷物理模型

    PHYSICAL MODEL OF MUD-FLOW TYPE KARST GROUND COLLAPSE

    • 摘要: 为了进一步深入研究覆盖型岩溶地面塌陷的发生条件和机理,在罗小杰关于土体塌陷理论的基础上,着重研究了泥流型地面塌陷地质现象、地质模型、物理模型及其数学表达式。根据软弱土在塌陷中的运动学响应特征及其周围土体变形表现,建立了泥流型岩溶地面塌陷的地质模型。由于软弱土具有高含水量、高液限、低抗剪强度和可流动的特点,将其视为高黏滞性的流体,在塌陷过程中呈层流状态流动;进而概化了泥流型岩溶地面塌陷的物理模型;依据牛顿内摩擦定律及极限平衡理论,提出了相应的数学表达式,探讨了泥流型地面塌陷的基本特征。认为泥流型地面塌陷将以一固定的速度发生,塌陷速度与岩溶通道直径的平方、软弱土的重度和天然含水量成正比,与黏性系数成反比。塌陷历时与软弱土的黏稠程度和厚度成正比,与重度和岩溶通道直径的平方正反比。

       

      Abstract: In order to further study the occurrence conditions and mechanism of the Covered Karst Ground Collapse(CKGC),on the basis of Luo Xiaojie's theory about CKGC,the geological phenomena, geological model, physical model and mathematical expression of the mud-flow type ground collapse are studied. According to the characteristics of the kinematic response of soft soil and the deformation of surrounding soil during collapse, the geological model of mud-flow type karst collapse is established. The soft soil is regarded as high viscosity fluid based on its characteristics of higher water content and liquid limit, lower shear strength, flowablity, and it flows in laminar state in the course of collapse. A generalized physical model of the Mud-flow type ground collapse is proposed, the corresponding mathematical expressions are given according to the law of Newton inner friction and Limit Equilibrium Theory, the basic characteristics of Mud-flow type ground collapse is discussed.it is that Mud-flow type ground collapse will occur at a fixed rate, and the collapse speed is proportional to the square of the diameter of the karst channel, the density and natural moisture content of the soft soil, and is inversely proportional to the viscosity coefficient. the duration of the collapse is proportional to the coefficient of viscosity and thickness of the soft soil, is inversely proportional to the density of soft soil and the square of the diameter of the karst channel.

       

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