中国井工煤矿区采动岩土体协同形变研究进展

Research progress in synergistic deformation between rock mass and soil due to underground coal mining in China

  • 摘要: 随着我国煤炭开采逐步转向深部以及煤炭开发战略西移,煤矿区采动岩土体形变问题更加突出,可对矿区生态及建(构)筑物安全造成严重影响,威胁矿区生态保护与高质量发展。为深入认识采动岩土体协同形变特征与机理,提升采动损害防控与土地生态损伤修复的有效性与针对性,根据不同覆土类型对采动岩土体协同形变研究进行分类,明确了层状结构为煤系地层结构的主要特征,阐明了采动岩土体协同形变效应与协同形变过程。系统梳理了黏质松散层、黄土、风积沙等3类覆土条件下采动岩土体协同形变研究进展,分析了采动岩土体协同形变的影响因素,指出岩层与土层厚度组合关系为采动岩土体协同形变的重要影响因素,岩土体界面为岩土体协同形变过程的关键界面。对现场实测、数值模拟、物理模拟、理论分析等技术手段进行评述,从研究方法、协同形变机理、岩土体交界面力学行为、岩土体形变空间形态、岩土体形变预测模型、新开采工艺与多煤层耦合条件下采动岩土体协同形变等方面讨论了现有研究存在的不足与关键科学问题,提出了科学研究路径,强调了应遵循的科学研究原则。分析认为,采动岩层−土层不同厚度组合以及不同土层类型组合的力学行为与机理、岩层−土层交界面的界面应力应变传递与扩展机制、构建可靠且适用性强的顾及采动岩土体协同形变效应的开采沉陷预测模型、采动岩土体协同形变空间形态演变特征、多技术方法力学原理的一致性与兼容性、西部生态脆弱矿区高强度开采与深部开采以及开采新技术引起的采动岩土体协同形变特征与机理、土层载荷传递效应定量研究等是未来研究的重点与发展方向。

     

    Abstract: With the gradual shift of coal mining from shallow to deep and the westward shift of coal development strategy in China, the deformation between rock mass and soil due to underground coal mining in coal mining areas has become more prominent, which can seriously affect the ecology of mining areas and the safety of construction (structure), thus threaten the ecological protection and high-quality development of mining areas. To further understand the characteristics and mechanism of synergistic deformation between mining rock mass and soil, and to improve the effectiveness and pertinence of mining damage prevention and control as well as land ecological damage restoration, some studies on mining rock mass and soil synergistic deformation are classified according to different soil cover types, and the stratified structure is the main feature of coal measure formation structure. The synergistic deformation effect and synergistic deformation process of mining rock mass and soil are clarified. The research progress of mining rock mass and soil synergistic deformation under three types of soil covering conditions, such as clay loose layer, loess layer and aeolian sand layer, are reviewed. The influencing factors of mining rock mass and soil synergistic deformation are analyzed, pointing out that the combination of rock layer and soil layer thickness is an important influencing factor of mining rock mass and soil synergistic deformation, and the interface of mining rock mass and soil is the key interface in the synergistic deformation process of rock mass and soil. The technological means such as field measurement, numerical simulation, physical simulation and theoretical analysis are reviewed. The shortcomings and key scientific problems of existing research are discussed from the aspects of research methods, synergistic deformation mechanism, interface mechanical behavior of mining rock mass and soil, spatial shape of rock mass and soil deformation, prediction model of rock and soil deformation, synergistic deformation of mining rock and soil under the coupling condition of new mining technology and multiple coal seams, etc. The scientific research path is proposed, and the principles of scientific research that should be followed are emphasized. Finally, future research emphasis and development directions are put forward, including: mechanical behavior and mechanism of different thickness combinations of mining rock mass and soil layers, as well as combination of different types of soil layer, interfacial stress-strain transfer and extension mechanism of rock mass and soil layer interface, construction of a reliable and applicable mining subsidence prediction model taking into account the synergistic deformation effect of mining rock mass and soil, spatial shape evolution characteristics of mining rock mass and soil deformation, consistency and compatibility of mechanical principles of multi-technical methods, synergistic deformation characteristics and mechanism due to high-intensive mining and deep mining in western ecological fragile region and new coal mining technology, quantitative study of load transfer effect of soil layer, etc.

     

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