应用有限元研究临涣矿区地层非采动变形沉降

APPLICATION OF FEM IN STUDYING SURFACE SUBSIDENCE INCURRED BY NON-MINING DEFORMATION IN LINHUAN MINE AREA

在实测地层压缩变形等资料的基础上，应用分析地层团结有限元的剑桥模型，对临涣矿区第四系地层内部非采动变形沉降的规律和机理进行了模拟计算研究．通过计算明确认识了临涣矿区松散地层变形沉降可分为２个区：Ⅰ区为第四含水层影响区，Ⅱ区为大气降水影响区．第四含水层水头疏降引起地层固结范围为Ⅰ区，而且有向上扩展的趋势．验证了第四含水层地层为主压缩层；地层变形随时间呈周期变化的规律，以及大气降水缓慢下渗引起浅部地层周期变形的作用原理．

Based on measured data of compressive deformation of the strata a FEM Cambridge model is used to study strata consolidation. Simulation is made to investigate the rules and mechanism of subsidence due to non-mining deformation of quaternary strata in Linhuan mine area. The compution shows that the subsidence of soft and weak strata in Linhuan can be divided into two zones: Zone Ⅰ is No. 4 water-bearing layer influencing zone. Zone Ⅱ is influenced by atmospheric rainfall. Water-drainage of No. 4 water-bearing stratum in Zone Ⅰmakes the strata to consolidate. And it tends to develop upwards. It is proved that No. 4 layer is the main compressive layer. Its deformation changes with time cyclically. And the rainfall infiltrates slowly into shallow layers, which brings about cyclic deformation of the ground strata.