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为了研究开挖顺序和布置形式对底部结构巷道群稳定性的影响,借用三维FLAC3D数值计算软件,结合大冶铁矿-180 m阶段底部出矿结构巷道群的工程实例,分析了交叉型巷道群围岩由于不同的开挖顺序而产生不同的应力状态、位移变形以及塑性屈服变化特征;对比了不同布置形式的底部结构在开挖影响下的稳定性.结果表明:交叉型巷道的应力、变形分布与开挖扰动的顺序和布置形式相关,开挖顺序和布置形式不同,巷道围岩的应力、位移变化程度有明显的差别;交替式开挖顺序对底部结构巷道群围岩的扰动程度最小;对称布置的底部结构在施工形成过程中表现的稳定性更高;依据上述研究结论,指导了大冶铁矿底部结构设计和施工顺序,同时对类似矿山具有借鉴意义.
In order to study the influence of excavation sequence and arrangement form on the stability of roadway group with bottom structure, three-dimensional FLAC3D numerical calculation software was used in combination with the engineering example of the outlying mine structure roadway group at the stage of -180m in Daye Iron Mine. The surrounding rock has different stress state, displacement deformation and plastic yield variation due to different excavation sequences. The stability of the bottom structure with different layouts under excavation is contrasted. The results show that the stress and deformation of the cross-type roadway The distribution and the disturbances are related to the order and arrangement of excavation disturbances. The excavation sequence and layout are different, and the changes of stress and displacement of the surrounding rock of the roadway are obviously different. The alternation excavation sequence has the least disturbances to the surrounding rock of the bottom structure tunnel group . The symmetrical layout of the bottom structure shows higher stability in the process of construction. Based on the above conclusions, the design and construction sequence of the bottom structure of Daye Iron Mine are instructed, meanwhile, it can be used for reference to similar mines.