Zhengzheng Cao, Shuaiyang Zhang, Zhenhua Li, Feng Du, Cunhan Huang, Wenqiang Wang
International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454000, Henan, China.
Henan Mine Water Disaster Prevention and Control and Water Resources Utilization Engineering Technology Research Center, Henan Polytechnic University, Jiaozuo, 454000, Henan, China.
Sci Rep. 2024 Jun 17;14(1):13900. doi: 10.1038/s41598-024-63344-w.
In order to reveal the disastrous mechanism of seepage instability of karst collapse column considering variable mass effect, a variable mass fluid-solid coupling mechanical model of water inrush is established, by considering the random distribution characteristics of a collapse column. Taking Qianjin coal mine as the research background, based on the Weibull distribution theory, the heterogeneous distribution characteristics of rock mass is described, and COMSOL Multiphysics numerical simulation software is employed to simulate the seepage characteristics and inrush water changes in collapse columns under different conditions of homogeneity, water pressure, and initial porosity. The research results show that the greater the homogeneity is, the more water conduction channels are formed, and the porosity increases accordingly, when considering the influence of different homogeneity on the seepage characteristics of broken rock mass, which eventually leads to water inrush accidents and a sharp increase in water inflow. Besides, when studying the seepage evolution law of different water pressures on a broken rock mass, an elevation of water pressure dramatically increases the porosity and seepage rate of the water. Over time, the broken rock particles gradually migrate and the fine particles are transported and eroded by the water flow, resulting in changes in the seepage characteristics and the formation of potential water diversion channels. Finally, when taking into account the effect of different initial porosity on the fractured rock mass seepage characteristics, the greater the original porosity is, the higher the seepage velocity is, and the particle migration increases the permeability. This leads to a more pronounced conductive water passage formation, which reveals the disastrous mechanism of seepage instability of karst collapse column considering variable mass effect.
为揭示考虑变质量效应的岩溶陷落柱渗流失稳灾害机制，考虑陷落柱的随机分布特征，建立了突水变质量流固耦合力学模型。以前进煤矿为研究背景，基于 Weibull 分布理论描述岩体的非均匀分布特征，采用 COMSOL Multiphysics 数值模拟软件模拟不同均匀性、水压和初始孔隙率条件下陷落柱的渗流特征及突水变化。研究结果表明，考虑不同均匀性对破碎岩体渗流特征的影响时，均匀性越大，形成的导水通道越多，孔隙率相应增加，最终导致突水事故及涌水量急剧增大。此外，研究不同水压作用下破碎岩体渗流演化规律时，水压升高会显著增大水体的孔隙率和渗流速度。随着时间推移，破碎岩颗粒逐渐迁移，细颗粒被水流搬运侵蚀，导致渗流特征发生变化并形成潜在的导水通道。最后，考虑不同初始孔隙率对裂隙岩体渗流特征的影响时，原始孔隙率越大，渗流速度越高，颗粒迁移增加了渗透率，导致导水通道形成更为明显，揭示了考虑变质量效应的岩溶陷落柱渗流失稳灾害机制。
