Research and application of mechanical models for the whole process of 110 mining method roof structural movement

110工法顶板结构运动全过程力学模型的研究与应用

For the 110 mining method,it is challenging to accurately calculate the support resistance of the roadway due to the lack of understanding of the dynamic movement of the overlying strata in this method.The consequential excessive support results in a significant increase in the cost of roadway support.The authors explored the overlying strata movement and roadway deformation of the gob-entry retaining in the 110 mining method to solve this problem.First,the typical stages of the roof-cutting gob-side entry were defined.Second,the mechanical model and calculation formula of the support resistance on the roof were explored.Then,using numerical simulation software,the starting ranges of the specific supports at different stages were verified and the feasibility of the support scheme was examined.Finally,combined with the field measurement data,the stress and the deformation of the gob roadway at different stages under the influence of two mining processes in the 110 mining method were obtained.The numerical simulation results obtained are consistent with the field test results,providing a theoretical basis for precision support at different stages by the 110 mining method.

由于以往对110工法覆岩结构动态运动特征不了解,难以精确计算巷道支护阻力,造成巷道的过度支护,导致巷道支护成本大幅度增加。本文针对上述问题,对110工法沿空留巷的覆岩结构运动及巷道变形规律进行了深入研究。首先,依据两次采动影响下巷道顶板结构受力和支撑边界的动态变化过程,对切顶沿空巷道划分典型阶段;其次,以关键块为主要研究对象,基于沿空巷道的覆岩顶板破断结构和垮落特征,建立回采不同阶段切顶巷道支护阻力的力学模型和计算公式;然后,利用数值模拟软件,初步确定具体分阶段支护起始范围并验证支护方案的可行性;最后,结合现场实测数据,总结出110工法在两次采动影响下巷道分阶段压力显现及其变形规律。本文所叙研究成果与现场实测结果基本一致,为110工法在不同阶段的分区精准支护提供理论依据。