Shao Jianli, Zhang Wenquan, Wu Xunan, Lei Yu, Wu Xintao
State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology, Qingdao 266590, China.
ACS Omega. 2022 Apr 13;7(16):13604-13614. doi: 10.1021/acsomega.1c07087. eCollection 2022 Apr 26.
Mining-induced fractures often constitute water inrush channels, which lead to mine water inrush accidents. In this paper, a coupled model of stress-seepage-damage based on micromechanics is established, which simulates the initiation and propagation of cracks in rock materials and their interaction with fluid flow. The method combines the continuous damage model with the effective stress principle, in which the elastic modulus and permeability are related to the damage variables. The model is implemented via the COMSOL code based on the finite element method, and the reliability of the model is verified by the axial compression-seepage test of standard rock samples. According to the actual geological conditions of F13 fault in Wugou Coal Mine, Anhui Province, the damage of the floor rock mass and the risk of fault water inrush in the 1033 mining face with 50, 40, 30, and 20 m waterproof coal pillars are predicted. When the coal pillar width is 30 or 20 m, the fault, the surrounding rock of the fault, and the failure zone of the floor constitute the water inrush channel. This model provides an intuitive understanding of the rock damage and water inrush evolution, which is difficult to observe, and will contribute to prevent water inrush disasters in practical engineering.
采动诱发的裂隙往往构成突水通道，导致矿井突水事故。本文建立了基于细观力学的应力-渗流-损伤耦合模型，模拟了岩石材料中裂纹的萌生、扩展及其与流体流动的相互作用。该方法将连续损伤模型与有效应力原理相结合，其中弹性模量和渗透率与损伤变量相关。该模型基于有限元方法通过COMSOL代码实现，并通过标准岩石样品的轴向压缩-渗流试验验证了模型的可靠性。根据安徽省五沟煤矿F13断层的实际地质条件，预测了1033采煤工作面留设50、40、30和20m防水煤柱时底板岩体的损伤及断层突水危险性。当煤柱宽度为30m或20m时，断层、断层围岩及底板破坏带构成突水通道。该模型为难以观测的岩石损伤和突水演化提供了直观认识，有助于在实际工程中预防突水灾害。
