某铁矿工程地质调查与工程应用

An iron engineering geological survey and its engineering application

对某铁矿300m、360m、390m、420m、460m、500m等中段的沿脉、穿脉和采切巷道共29条测线进行工程地质调查,统计显示区内有二组控制性节理,优势结构面倾向SE,约占80%节理倾角介于50~90°,多数节理的走向与矿体走向相近。利用RMR法对岩体进行分级评价,发现灰岩、石英岩和砂岩都属于III类;运用FLAC^3D对巷道和优势结构面建模并模拟分析,可知影响巷道失稳的主要因素是其轴线与结构面走向平行,对矿山后续巷道布置有指导作用。

In this paper,the writer makes an engineering geological investigation on 29 survey lines which are decorated at ore drifts、transverse drifts or mining tunnels of 300m、360m、390m、420m、460mand500min an iron ore,and finds that there being 2groups of main joints by statistics,the trend of dominant structural plane being SE,about 80%joint angle ranging between 50~90°,and most direction of them being consistent with vein.Evaluating rock mass by Rock Mass Rating Classification method,we find rock mass quality classification of limestone、quartzite and sandstone all belong to 3rd category;And modeling and analyzing tunnel and dominant structural plane by Flac^3 D,we know that the main factor of tunnel being unstable is that it is parallel with structural plane which has a guiding role for subsequent tunnel design.