摘要
为了掌握近距离煤层群开采时下煤层对上煤层已扰动“关键层”的影响,通过FLAC^(3D)数值模拟的方法,建立煤层群采空区下开采的模型,通过接触面单元模拟关键层断裂面,以软化法处理采空区,分析下行开采时,上煤层已扰动关键层破断面覆岩应力破坏特征,并通过现场工程实践定性验证数值模拟的可靠性。实验结果表明:通过预制已扰动关键层破断面,并使用采场软化法处理采空区可以实现模拟效果,更能符合客观实际情况。由于已扰动关键层上方非对称应力组合拱的存在,保证了破断块在工作面上方时能形成回转变形而不会出现台阶下沉,同时分析了破断块界面应力分布。
In order to grasp the impact of the lower coal seam on the disturbed"key layer"of the upper coal seam during close distance coal seam group mining,a model of mining under the coal seam group goaf is established using FLAC^(3D) numerical simulation method.The contact surface unit is used to simulate the fracture surface of the key layer,and the goaf is treated with softening method.The stress failure characteristics of the overlying rock in the disturbed key layer fractured surface of the upper coal seam during downward mining are analyzed,and the reliability of the numerical simulation is qualitatively verified through on-site engineering practice.The experiment results show that the simulation effect can be achieved by prefabricating the disturbed key layer fractured surface and using the stope softening method to treat the goaf,which is more in line with the objective reality situation.Due to the presence of asymmetric stress combination arches above the disturbed key layer,it ensures that the fractured block can form rotary deformation without step sinking when the fractured block is above the working face.At the same time,the stress distribution at the interface of the fractured block is analyzed.
作者
朱玉良
Zhu Yuiang(Huizhou Jiaotou Xinwei Green Quarry Co.,Ltd.,Guangdong Huizhou 516000)
出处
《山东煤炭科技》
2024年第4期44-48,53,共6页
Shandong Coal Science and Technology
关键词
砌体梁
预制关键层破断面
矿山压力
voussoir beam
prefabricated key layer fractured surface
mine pressure
