充填法开采诱发矿山地表沉降数值分析研究

Numerical Analysis of Surface Subsidence Induced by Backfill Mining

地下开采对地表河流、公路、构筑物等扰动影响是矿山首要关注的问题,传统的岩体移动带圈定难以直接确定地表河流、道路的稳定性。为探究地下开采对地表沉降的影响,采用FLAC 3D软件对小栗子一、二铁矿区充填开采过程中地表的岩移数值模拟计算的方法,分析地下开采过程对地表沉降变形、地表河流及邻矿运输道路稳定性等的影响。结果表明:地表的绝对位移较小,倾斜率、曲率、水平变形值等指标均远小于规范允许值,稳定性较好,整个地表均较为稳定,同时进一步说明了要保持地表河流、运输道路的稳定,采空区回填非常必要。计算结果可为矿山的安全开采提供一定的理论支撑。

The disturbance effect of underground mining on surface rivers,roads and structures is the primary concern of mines,and it is difficult to determine the stability of surface rivers and roads directly by delineating the traditional rock movement zone.In order to explore the influence of underground mining on surface subsidence,FLAC 3D software was used to simulate the numerical calculation of surface rock movement in the filling mining process of Xiaolizi No.1 and No.2 iron mining areas,and the influence of underground mining process on surface subsidence deformation,surface river and the stability of adjacent mining transport road was analyzed.The results show that the absolute displacement of the ground surface is small,the index of tilt rate,curvature,horizontal deformation value is far less than the allowable value of the standard,and the stability is good,and the whole ground surface is stable.At the same time,it is necessary to backfill goaf to maintain the stability of surface rivers and roads.The calculation results provide theoretical support for safe mining.