Zhang Haoyu, Guo Guangli, Li Huaizhan, Wang Tiening, Ni Jie, Meng Hao
School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221116, China.
Collaborative Innovation Center for Resource Utilization and Ecological Restoration of Old Industrial Base, China University of Mining and Technology, Xuzhou, 221116, China.
Sci Rep. 2025 Apr 2;15(1):11207. doi: 10.1038/s41598-025-94001-5.
Globally, extensive land regions have fallen victim to coal mining subsidence, rendering the reuse of goaf sites a crucial concern. The residual deformation amount of these sites is the linchpin for determining their reusability. Presently, numerical computations of residual deformation in goafs, which overlook water-rock coupling, breed significant errors, posing severe threats to the safety of on-site structures. To remedy the situation, this research hinges on the mechanical experiment results of fractured rock masses under water-rock interaction within the goaf. By leveraging an embedded programming language, it pinpoints the irregular damage range of overlying strata due to water-rock effects. Then, corresponding mechanical parameters are allocated to the surrounding rocks at diverse spatial positions, with the erosive impact of water-soaked coal pillars also factored in. This gives rise to a novel numerical method that more precisely gauges groundwater's influence on strata movement and surface subsidence. Using the 01 working face of a Shandong mine as a practical backdrop, the new method verifies its reliability and accuracy. When contrasted with traditional approaches, be it neglecting water filling or assuming full saturation in the goaf, it slashes the calculation error by 20%, furnishing new approaches for residual deformation calculation and novel perspectives for evaluating site stability under complex geological conditions.
在全球范围内，大量土地因采煤沉陷而受损，使得采空区场地的再利用成为一个至关重要的问题。这些场地的残余变形量是决定其可再利用性的关键因素。目前，采空区残余变形的数值计算忽略了水岩耦合，产生了较大误差，对现场结构安全构成严重威胁。为解决这一问题，本研究基于采空区内水岩相互作用下破碎岩体的力学实验结果。通过利用嵌入式编程语言，确定了水岩作用导致的上覆岩层不规则损伤范围。然后，将相应的力学参数分配到不同空间位置的围岩中，并考虑了浸水煤柱的侵蚀影响。由此产生了一种新的数值方法，能够更精确地测量地下水对岩层移动和地表沉陷的影响。以山东某煤矿的01工作面为实际背景，新方法验证了其可靠性和准确性。与传统方法相比，无论是忽略采空区充水还是假设采空区完全饱和，新方法都将计算误差降低了20%，为残余变形计算提供了新方法，为复杂地质条件下场地稳定性评价提供了新视角。
