水浸煤柱坝体动静载累积损伤灾变机理及防控

地下水库是实现煤矿水资源保护与利用的有效途径，其中煤柱坝体损伤破坏机理及稳定控制是地下水库工程的关键。煤柱坝体受复杂应力、长期水浸及“孔隙—裂隙”双重结构影响，产生“损伤—渗流—累积损伤”效应，严重时将导致坝体失稳溃决灾害。本项目基于浅埋近水平和深部倾斜煤层两种典型工程背景，监测量化煤柱坝体的应力与水环境场量，表征重构不同损伤煤体“孔隙—裂隙”结构；构建煤体结构力学模型及“孔隙—裂隙”双渗流本构关系，进而阐明煤柱坝体强扰动作用下动静载应力响应机制和长期水浸作用下“孔隙—裂隙”双渗流场演化规律；探索动静载与水浸多场耦合综合模拟实验方法，揭示“应力—水”多场耦合作用下煤柱坝体累积损伤灾变机理；提出煤柱坝体合理尺寸设计方法，形成地下水库煤柱坝体长期安全运行智能化监测控制技术。预期研究成果将为煤矿地下水库系统建设与长期安全运行提供科学依据。

Underground reservoir is an effective way to protect and utilize coal mine water resources, to which the damage evolution mechanism and stability control of coal pillar dams are the key. Due to the influences of complex stress, long-term water immersion, and “pore-fissure” dual structure, coal pillar dams have the effect of “damage-seepage-accumulated damage”, which leads to instability and burst of the dams in severe cases. Based on the study of two typical shallow buried nearly horizontal coal seams and deep buried inclined coal seams, this project will monitor and quantifiably represent the stress and water environment, and carry out the three-dimensional reconstruction of coal structures. The coal structural mechanics model and the “pore-fissure” dual seepage constitutive relation will be established to uncover the stress response mechanism of coal pillar dams with dynamic and static loads, and reveal its “pore-fissure” dual seepage evolution law with long-term water immersion affect. With comprehensive simulation system exploration, the project will consider the multi-field coupling effect of dynamic-static loads and water immersion, and thereby uncover the accumulated damage catastrophic mechanism of coal pillar dams. Finally, it will present the reasonable size design method, intelligent security monitoring system and long-term stability control technology. The research results will provide scientific basis for the construction and long-term safe operation of underground reservoirs.