多断层构造应力下回采巷道围岩破坏特征及控制技术研究

Study on Failure Characteristics and Control Techniques of Surrounding Rock in Mining Roadway under Multi-fault Tectonic Stress

断层构造结构复杂,在煤矿开采过程中会造成应力分布不均,顶板破碎不连续以及围岩性质的改变,增加巷道围岩控制的难度.针对某矿11401综采工作面存在较多大小断层,顶板煤岩层裂隙较为发育且易垮落的问题,利用FLAC^3D数值模拟软件分析多断层构造应力下回采巷道变形破坏特征并提出锚杆+金属网+锚索+钢筋梯子梁的联合支护方案.通过工程试验反馈变形监测结果表明:顶底板围岩的最大移近量190 mm,两帮围岩的最大移近量202 mm,有效地控制了围岩变形,达到了预期的支护要求.

The structure of fault structure is complex,which will cause the distribution of stress,discontinuity of roof crushing and change of surrounding rock properties in the process of coal mining,increasing the difficulty of control of roadway surrounding rock.Aiming at the problem that there are many faults in 11401 fully mechanized mining face and the fractures in roof coal and rock layers are more developed and prone to collapse of a coal mine in Inner Mongolia,Using FLAC^3D numerical simulation software to analyze the deformation failure characteristics of mining roadway under multi-fault tectonic stress and put forward bolt+metal combined support scheme of net+anchor4-reinfbrcement ladder beam.The deformation monitoring results feedbacked through engineering tests show that the maximum displacement of surrounding rock of roof and floor is 190 mm,and the maximum displacement of two surrounding rocks is 202 mm,which effectively controls the deformation of surrounding rock and reaches the expected support requirements.