充填采矿法引起的地表变形数值模拟研究

Numerical Simulation of Ground Deformation Caused by Backfill Mining

胶结充填采矿法开采急倾斜矿体对地表的影响与其他采矿方法不同,有着自己的规律。本研究利用FLAC3D数值模拟软件对金川充填采矿法引起的地表变形进行了研究,提出了金川二矿区地表变形的一般规律,初步得出金川二矿区地表裂缝的产生是由于采矿所引起的结论;并且解释了地表裂缝的出现滞后于开采的现象;对计算结果用GPS测量结果进行了校合,验证了计算的可靠性;最后,研究了充填体弹性模量对地表沉降的影响。

The impact on ground surface caused by cemented filling method when used for mining steeply inclined orebody is different from that by other methods and has its own law. FLAC3D numerical simulation software is used to study the ground surface deformation caused by cemented filling in Jinchuan No.2 mining district. As a result, the general law of ground deformation in this district is proposed, and a preliminary conclusion is drawn that the ground fissures are caused by the mining. The phenomenon that the surface fissure occurrence lags behind the mining is interpreted, the calculation results are revised with GPS measurement results and the calculation reliability is verified. Finally, the effect of the elastic modulus of filling body on surface subsidence is studied.