煤矿地下水库是我国西部矿区水资源保护的重要工程，煤柱坝体蠕变失稳将导致煤矿地下水库失效，并引起严重的生态环境灾害和生产事故。项目围绕浸水软化-应力-渗透压作用下的煤岩体蠕变失稳机理、不同条件下煤矿地下水库煤柱坝体蠕变失稳致灾机理等关键科学问题开展研究。拟采用室内试验、理论分析和数值模拟相结合的方法，分析损伤煤岩浸水后力学性能的时效劣化机理和应力-渗透压作用下浸水煤岩蠕变力学参数的演化规律，建立考虑浸水软化、应力和渗透压影响的煤岩蠕变理论模型。基于该模型，采用数值模拟分析不同地质条件、工程条件和工作条件下煤矿地下水库煤柱坝体的蠕变失稳致灾机理。以煤柱坝体蠕变失稳区扩展速度和煤柱坝体宽度为参量，建立煤柱坝体蠕变寿命预测模型，并对典型煤矿地下水库煤柱坝体工程开展实际的蠕变寿命评价。项目研究将为煤矿地下水库煤柱坝体设计提供指导，丰富煤矿地下水库安全理论体系，具有重要的应用价值和科学意义。

Coal mine underground reservoirs (CMUR) are efficient infrastructures for protecting the water resource in the coal mine area of western China, whereas the creep instability of coal pillar dam will destruct the safe operation of CMUR, as a consequence, causing serious eco-environmental disasters and industrial accidents. In this project, two key scientific issues will be solved, specifically, the creep mechanism of coal considered the influence of long-term water immersion and hydro-mechanical coupling in CMUR, and the instability mechanism of coal pillar dam induced by creep under different conditions of CMUR. Laboratory experiments, theoretical analysis and multi-field numerical modelling will be applied to study the primary contents of this project, involves the time-dependent mechanical performance of damaged and chemical water immersed coal, and the evolution of creep parameters of chemical water immersed coal, thereby proposing a creep model of coal that considered the influence of water immersion soften, stress and hydraulic pressure in CMUR. Based on the proposed creep model, numerical modelling will be launched targeting the disaster-causing mechanism induced by creep instability of coal pillars under the geological, engineering and operating conditions in CMUR. A creep life forecasting model will be proposed, in which the expanding speed of creep instability zone and the width of coal pillar dam will be regarded as the variate. At last, the creep life of a real engineering case will be evaluated. The outcomes of this project will provide guidance for the design of coal pillar dam in CMUR and enrich the safety theory of underground reservoir of coal mine, which have important application prospects and scientific significance.