煤矿深部开采动力灾害多场耦合监测预警研究

Deep coal mining dynamic disaster have complex formation mechanism, induced by many factors restrict the development of the dynamic disaster warning technology. In view of the inseparable relation between coal mine dynamic disaster and the coal rock physical and mechanical properties, and the relation between ground temperature and the occurrence of coal seam, and coal mine dynamic disaster is the result of the interaction such as ground stress and gas pressure. The Project using the method of site visits, theoretical analysis, numerical simulation, experimental research and field applications study mechanism of multi-factor coupling warning for dynamical disaster in deep colliery, and accomplish the multi-factor coupled warning for dynamic disaster. Main research contents: (1)The quantitative study of the impact of the physical and mechanical properties of coal and rock dynamic disasters deep coal mining; (2)Establishing the nonlinear mathematical relationship between deep coal mining ground stress and rock pressure; (3)Developing the multi-factor coupled dynamic disaster experimental apparatus, and analyzing the disaster coupled mechanism of ground stress, gas pressure and ground temperature in deep mining conditions,Establishing a nonlinear mathematical model, quantitative studying multi-factor coupling criterion of dynamic disaster; (4) Establishing multi-factor coupled monitoring system, obtain monitor data and analysis the operation effect by field opration, verifying the multi-factor coupling result of experimental and theoretical analysis, and putting forward the deep dynamic disasters multi-factor coupled monitoring and early warning program. Lay the foundation for the development of colliery multi-factor coupling dynamic disaster warning system.

煤矿深部开采动力灾害形成机制复杂，诱发因素众多，制约了动力灾害监测预警技术的发展。煤矿动力灾害与煤岩物理力学性质相关，与地温、煤层赋存和地质构造等因素有关，是地应力和瓦斯压力等因素共同作用的结果。项目采用现场调研、理论分析、实验研究、数值模拟和现场应用的研究方法，探讨煤矿动力灾害多场耦合监测预警机制，实现动力灾害多场耦合监测预警。主要研究内容：（1）定量研究煤岩物理力学性质对动力灾害的影响规律；（2）建立煤矿深部开采地应力和矿山压力数学统计模型；（3）利用动力灾害多场耦合实验装置，实验分析煤矿地应力、瓦斯压力和地温对动力灾害耦合作用机理，研究多场耦合监测预警非线性数学模型，建立动力灾害多场耦合作用判据；（4）组建动力灾害多场耦合监测系统，煤矿现场应用，在线获取监测数据，分析运行效果，验证多场耦合实验和理论分析结果，提出动力灾害多场耦合预警方案，为动力灾害多场耦合预警系统研发奠定基础。

煤矿深部开采动力灾害形成机制复杂，诱发因素众多，制约了动力灾害监测预警技术的发展。煤矿动力灾害与煤岩物理力学性质相关，与地温、煤层赋存和地质构造等因素有关，是地应力和瓦斯压力等因素共同作用的结果。项目采用现场调研、理论分析、实验研究、数值模拟和现场应用的研究方法，研究煤矿动力灾害多场耦合监测预警机制，实现了动力灾害多场耦合监测预警。主要研究成果如下。.利用自主研发的DDTS-500煤岩动力灾害监测系统进行煤与瓦斯突出的模拟试验。在固定垂直应力作用下发生突出时，瓦斯压力与水平应力呈减函数变化。当水平应力增大时，发生突出时所需最大瓦斯压力变小；当水平应力减小时，发生突出时所需最大瓦斯压力变大。在固定水平压力作用下发生突出时，瓦斯压力与垂直压力呈减函数变化。当垂直应力增大时，发生突出时所需最大瓦斯压力变小；当垂直应力较小时，发生突出时所需最大瓦斯压力变大。煤与瓦斯突出是地应力和瓦斯压力共同作用的结果，采掘作业破坏了煤层原岩应力平衡，引起地应力重新分布，使煤岩裂隙发育，煤层中吸附瓦斯解吸为游离瓦斯，使煤体内瓦斯压力增大。.通过实验室实验与分析，分析了深部开采条件下煤岩物理力学参数对动力灾害发生的影响规律，建立了深部开采条件下动力灾害多物理场耦合数学模型。结合所建立的煤岩应力场、瓦斯压力场与温度场三场的耦合数学模型，分析了在多场耦合作用下含瓦斯煤岩体埋深、瓦斯压力及温度之间的相互作用及其对动力灾害发生的影响规律，为进行更切合现场实际的煤岩动力灾害规律研究提供理论基础。.在龙煤集团动力灾害严重矿井进行了现场工业性试验，实验室测试了煤岩物理力学性质，现场应用多场耦合实验装置，在线监测收集动力灾害前兆信息，研究了地应力、瓦斯压力等因素对动力灾害耦合作用规律，并组建了动力灾害多场耦合监测预警系统。