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针对深部沿空留巷厚硬顶板大面积悬露及采空侧顶板长悬臂劣化围岩应力环境难题,分析了千米深井厚硬顶板直覆沿空留巷矿压显现特征,提出了该条件下沿空留巷超前工作面采场顶板深孔预裂爆破放顶优化与采空侧顶板结构破断卸压相结合的围岩结构优化控制技术;同时基于理论模型与树脂模型结果,分析了厚硬顶板条件留巷充填墙体上方载荷与采空侧顶板悬臂长度的相互关系,指出利于留巷围岩长期稳定的采空侧顶板悬臂长度不大于12 m。相关研究成果成功应用于平煤集团12矿己14-31010工作面沿空留巷,为同等条件下的实施沿空留巷提供了借鉴。
In view of the problem of the stress and environment of the surrounding rock of thick gable roof in deep gob-side entry retaining gateway and the long cantilevered deterioration of gob-side roof, the characteristics of underground pressure in straight gob- The optimization of control technology of the surrounding rock structure combining with the optimization of deep hole presplit blasting in the roof face of the gob-side entry retaining roof combined with the breaking and pressure-relief of the roof of the gob-side entry; meanwhile, based on the theoretical model and resin model results, The relationship between the load above the retaining wall and the cantilever length of the gob-side roof is indicated. The cantilever length of the gob-side roof which is conducive to the long-term stability of surrounding rock is less than 12 m. The relevant research results have been successfully applied to the gob-side entry retaining of 12-3 mine of Pingdingshan Coal Mine, which provides a reference for the implementation of gob-side entry retaining under the same conditions.