In view of the problem strong rock pressure is easy to occur in coal seam mining in western gully terrain. Based on the coal seam mining conditions in the gully area under the compound key strata of Zhujiamao Coal Mine, the methods of similar simulation, theoretical calculation and analysis, numerical simulation and field measurement are adopted. The dynamic structure model of the key strata of the gully is constructed, and the mechanism and prevention and control measures of the strong rock pressure in the gully area of the working face under the compound key strata are analyzed. The research shows that the upper slope section of the gully area first undergoes rotary deformation, and then the chain structure formed by the broken block occurs sliding instability and impacts inferior key strata, resulting in strong rock pressure behavior in the working face. The calculation formula of the first breaking step distance of the main key strata rotation deformation and sliding instability during the movement of the overlying strata is derived. The calculation results show that the initial rotation deformation and sliding instability breaking step distances are 27 and 142 m, respectively, which are in good agreement with the support crushing at 145 m of the first gully. Using 3DEC numerical simulation, the stress of the second gully is reduced by 3.8 MPa after pressure relief, which verifies the position of strong rock pressure calculated by the formula and provides a theoretical basis for subsequent hydraulic fracturing. According to the mechanism, the comprehensive prevention and control measures of strong rock pressure in gully terrain are put forward. The support resistance of the working face is calculated to be 10,011 kN by the support resistance formula, and the ZY11000/14/34D hydraulic support is used. The working resistance of the calculated dangerous area after hydraulic fracturing is basically lower than 30 MPa, and the control effect is good. It has reference significance for coal seam mining through gully terrain.

中文翻译：

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复合关键地层沟壑区强岩压机理及控制

针对西部沟壑地形煤层开采易产生强烈岩压的问题。根据朱家茅煤矿复合关键地层下沟壑区煤层开采条件，采用相似模拟、理论计算分析、数值模拟和现场实测等方法。构建了冲沟关键地层动力结构模型，分析了复合关键地层下工作面冲沟区强岩压的机理及防治措施。研究表明，沟壑区上坡段首先发生旋转变形，破碎块形成的链状结构发生滑动失稳并冲击下层关键地层，导致工作面产生较强的岩压行为。推导了上覆地层运动过程中主关键地层旋转变形和滑动失稳首破步距的计算公式。计算结果表明，初始旋转变形和滑动失稳破断步距分别为27和142 m，与第一沟145 m处的支架破碎吻合较好。利用3DEC数值模拟，泄压后第二沟应力降低了3.8 MPa，验证了公式计算的强岩压位置，为后续水力压裂提供了理论依据。根据该机理，提出了沟壑地形强岩压综合防治措施。根据支护阻力公式计算工作面支护阻力为10011 kN，采用ZY11000/14/34D液压支架。水力压裂后计算危险区域工作阻力基本低于30 MPa，治理效果良好。对冲沟地形煤层开采具有参考意义。