ISSN 1003-8035 CN 11-2852/P
    陶小虎,叶明,龚建师,等. 基于LBM-DEM细观数值模拟的水力诱导覆盖型岩溶地面塌陷发育过程分析[J]. 中国地质灾害与防治学报,2024,35(1): 1-8. DOI: 10.16031/j.cnki.issn.1003-8035.202207027
    引用本文: 陶小虎,叶明,龚建师,等. 基于LBM-DEM细观数值模拟的水力诱导覆盖型岩溶地面塌陷发育过程分析[J]. 中国地质灾害与防治学报,2024,35(1): 1-8. DOI: 10.16031/j.cnki.issn.1003-8035.202207027
    TAO Xiaohu,YE Ming,GONG Jianshi,et al. Formation process of the cover-collapse sinkhole induced by groundwater changes based on the coupled LBM-DEM numerical simulation at micro scale[J]. The Chinese Journal of Geological Hazard and Control,2024,35(1): 1-8. DOI: 10.16031/j.cnki.issn.1003-8035.202207027
    Citation: TAO Xiaohu,YE Ming,GONG Jianshi,et al. Formation process of the cover-collapse sinkhole induced by groundwater changes based on the coupled LBM-DEM numerical simulation at micro scale[J]. The Chinese Journal of Geological Hazard and Control,2024,35(1): 1-8. DOI: 10.16031/j.cnki.issn.1003-8035.202207027

    基于LBM-DEM细观数值模拟的水力诱导覆盖型岩溶地面塌陷发育过程分析

    Formation process of the cover-collapse sinkhole induced by groundwater changes based on the coupled LBM-DEM numerical simulation at micro scale

    • 摘要: 文章以水力驱动的覆盖型岩溶地面塌陷为背景,基于离散元方法和格子Boltzmann方法,采用Bouzidi插值反弹边界格式和动量交换法,建立一种可以从细观角度模拟覆盖型岩溶塌陷的二维格子Boltzmann方法—离散元方法流固耦合模型。在此基础上对承压水下降引起覆盖型岩溶塌陷数值模拟开展了探索性研究。模拟结果表明:承压水位下降工况中地下水主要对隔水层岩溶开口处的颗粒产生影响,对土洞周围土体产生向下的作用力;土体颗粒的剥落容易造成土颗粒原位置和上方位置处水压的陡降,从而造成较强的水力坡降,使得地下水对内部颗粒作用力陡增,容易引起上方颗粒在地下水作用力和重力作用下失稳,导致从土体颗粒失稳至土层塌陷逐渐加速。研究成果对进一步从细观尺度进行水力驱动的覆盖型岩溶地面塌陷的发育过程与特征研究具有理论及实际意义。

       

      Abstract: To investigate the hydraulic characteristics and soil behaviors during the formation of cover-collapse sinkholes induced by the groundwater changes, a 2D fluid-solid coupling model was developed based on discrete element method and lattice Boltzmann method. This model utilizes the linearly interpolated bounce-back scheme of Bouzidi and the momentum exchange method, allowing for the simulation of the formation of cover-collapse sinkhole from a microscopic perspective. Using the fluid-solid coupling model, an exploratory study was conducted to simulate the formation of cover-collapse sinkholes induced by a decrease in the hydraulic head of confined aquifers. Simulation results indicate that when the water level of a confined aquifer declines, the groundwater flow mainly affects the particles located above a cave opening and produces a downward force on the surrounding soil. When soil particles spall, the hydraulic heads at the positions of the spalled soil particles drop sharply. This results in a significant increase in the hydraulic gradient, causing the groundwater force on internal particles to sharply increase as well. As a result, the upper particles lose stability due to the combined force of groundwater dragging and gravitational force, which can lead to a gradual acceleration process of collapse. The research results provide valuable insights into the understanding of cover-collapse sinkhole formation induced by the groundwater changes.

       

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