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针对复杂结构大断面硐室围岩控制难题,采用FLAC~(3D)数值计算方法研究了煤仓上部卸载硐室变形破坏特征,提出了分区耦合强力支护围岩控制技术。结果表明,复杂结构大断面硐室具有大面积非均称破坏特征,塑性区深度达到13.5 m,浅部围岩为拉剪破坏,承载能力大幅下降,深部围岩为剪切破坏,承载能力下降幅度较小,拱部和窄岩柱破坏尤为严重,是围岩控制的关键部位。针对围岩的大面积非均称破坏特征,提出了“分阶段围岩控制、分区耦合支护、关键部位强力支护和封闭式支护”围岩控制方法,实现了支护与围岩力学特性的耦合,有效控制了围岩变形破坏的发展。
Aiming at the control problem of the surrounding rock of complex section with large section, the deformation and failure characteristics of the unloading chamber in the upper part of the bunker are studied by FLAC 3D numerical method. The results show that the large-scale chamber with complex structure has a large area of non-uniform damage characteristics. The depth of the plastic zone reaches 13.5 m. The shallow surrounding rock is tensile and shear failure, the bearing capacity decreases sharply, the deep surrounding rock is sheared and the bearing capacity decreases The amplitude is rather small, and the damage to the arch and narrow pillars is particularly serious, which is the key part of the surrounding rock control. Aiming at the large-scale non-symmetrical damage characteristics of surrounding rock, a control method of surrounding rock of staged rock control, zonal coupling support, strong support of key parts and closed support is proposed. Coupling of rock mechanics properties effectively controls the development of surrounding rock deformation and failure.