滇西马厂箐金多金属矿区水文及工程地质评价

Hydrogeology and engineering geology evaluation of Machangqing Gold Polymetallic District in western Yunnan

马厂箐金多金属矿区位于滇西北丽江金及多金属成矿带中部,成矿地质条件优越。矿区地下水类型丰富,主要分为孔隙水、裂隙水及岩溶水3种类型,各类型地下水富水性差异大,以微硬水为主。地下水渗流作用对岩体物理力学性质及矿物组分改变较大,从而降低岩体质量和强度。工程地质条件受构造影响程度较深,致使岩体整体破碎,完整性较差;矿区工程地质岩组中以碳酸盐岩和碎裂岩为代表的较坚硬岩组和软弱岩组岩体物理力学性质最差,强度最低;以碎屑岩和岩浆岩为代表的坚硬岩组次之。综合评价矿区水文地质及工程地质,对矿山后续开发及安全生产具有重要的指导意义。

The Machangqing Gold Polymetallic District is located in the middle of the Lijiang gold polymetallic metallogenic belt in northwestern Yunnan with a superior geological background for mineralization.The district has variety of groundwater types,which can be divided into three categories:pore water,fissure water and karst water.The different groundwater shows great differences in water richness and the main type is micro-hard water.Groundwater seepage can greatly change the physical,mechanical properties and mineral components of the rock mass,thus reduces the quality and strength of the rock mass.The engineering geological conditions are deeply affected by the structures,causing the overall fragmentation and poor integrity in rock mass.Among the engineering geological rock group in the district,the relatively hard and soft rock formations,represented by carbonate and cataclastic rocks,have the worst physical and mechanical properties and the poorest strength,followed by the hard rock group represented by clastic rocks and magmatic rocks.The comprehensive evaluation results of hydrogeology and engineering geology have guiding significance for further mine development and safe production.