金川深部矿区地应力场及其对地下洞室围岩稳定性的影响分析

Analysis of In-situ Stress and Its Influence on the Stability of Wall Rock of Underground Cavern in Jinchuan Deep Mining Area

甘肃金川矿区是一座资源丰富、矿体厚大、地应力较高的多金属共生特大型矿床,赋存有中国目前最大的硫化铜镍矿床。因此,加强金川矿区地应力的研究工作,掌握该区地应力分布规律,对矿区的安全高效开采具有重要意义。本文对收集到的野外及三轴试验实测数据整理后,利用科学绘图软件ORIGIN进行拟合分析,从而获取原岩应力特征、重分布应力特征及力学参数。通过研究分析得出,区内天然应力状态下岩石的强度较高,但岩体整体强度比较低,属一般到不稳定类围岩。高应力和岩性较差是导致该区地下洞室巷道变形破坏的主要原因,其变形破坏形式主要表现为偏压弯曲变形、侧墙内挤变形、顶板开裂和底鼓等。

Jinchuan mining area in Gansu Province is a super large polymetallic deposit with rich resources,thick ore bodies and high in-situ stress.There is the largest copper nickel sulfide deposit in China.Therefore,it is very important for the safe and efficient mining of Jinchuan mining area to strengthen the research of in-situ stress and distribution law of in-situ stress in this area.In this paper,based on the collected field and triaxial test data,the scientific mapping software ORIGIN is used for fitting analysis,so as to obtain the stress characteristics,redistribution stress characteristics and mechanical parameters of the original rock.it is concluded that the strength of rock in the natural stress state in the area is high,but the overall strength of rock mass is relatively low,which belongs tounstable wall rock.High stress and poor lithology are the main reasons for the deformation of underground tunnel in this areasand the deformation forms are mainly bending deformation under bias pressure,extrusion deformation in side wall,roof cracking and floor heave.