矿井明槽段井筒受力性能有限元分析

Finite element analysis of shaft stress characteristics in open-channel section of coal mine

以神东煤炭集团补连塔煤矿2#辅运平硐场地配套设明槽段井筒工程为实例,利用ANSYS软件对煤矿明槽段井筒(截面为三心拱)在土压力作用下受力性能进行数值分析,计算其内力、位移和相关力学参数,分析其结构受力性能。模拟结果表明,不同于煤矿井下巷道设计(巷道周围为岩石),明槽段井筒由于埋深较浅,井筒周围多数为土体,其受力明显不同于井下巷道;如果设计合理,明槽段井筒达到极限荷载以后,仍可表现出良好的受力性能和后期变形性能,可充分发挥其结构优点;"土拱效应"对井筒受力性能影响较大,主应力方向发生了偏转,土体会产生变形或错动,因而产生应力释放现象。分析认为,明槽段井筒采用大开挖施工技术,施工方便且可以使用预制构件,便于工厂化生产,加快工程建设速度,该有限元分析方法具有一定的可推广性。

Taking Bulianta coal mine of Shendong Coal Group as an example,using ANSYS software,the mechanical characteristics of open-channel shaft(three-core arch section)under earth pressure were analyzed,its internal force,displacement and related mechanical parameters were calculated,and its structural mechanical performance was analyzed.The simulation results show that due to the shallow buried depth of the open-channel section and the majority of the surrounding soil around the shaft,the stress is obviously different from that of the underground roadway.If the design is reasonable,the shaft in open-channel section can still show good mechanical performance and late deformation performance after reaching the ultimate load,and can give fully exert its structural advantages.The "soil arching effect" has a great influence on the stress of the shaft,that is,when the direction of the principal stress is deflected,the soil will be deformed or distorted,resulting in stress release.The open-channel section of the shaft adopts large excavation construction technology,which is convenient to construct,prefabricated components can be used,and the construction speed is fast.