Affects Of Tectonic And Mining To The Surrounding Rock And Ore-rock Stability In No.2 Mining Area Of Jinchuan Nickel Mine

Rock mass is a discontinuous geological medium incised by structural planes with varied mechanical properties and spatial conditions. The numerous examples of rock mass engineering indicate that the deformation and the broken law of rock mass depend on its structural characteristics and the stability of rock mass is determined by the very structure of rock mass. Therefore, in order to ensure the structural stability of rock mass and the safety of production the investigation about the natural characteristics and the mechanical properties of structural plane, the evaluation of stability of underground engineering must be performed.In this paper, the author focuses on a difficult problem faced by the Jinchuan Group Corporation and combines the mechanics theory with the engineering practice to research this problem. The main subject of investigation is the structural planes of rock mass that affect the structural stability of rock mass. We take the underground mining and 1150 horizontal jamb in the No.2 Mining Area of Jinchuan Nickel Mine as an illustrating example. Based on detailed investigation and lots of measured data in other similar underground works, we employ the methods of theoretical analysis, field survey, and computer simulation to study the affects of geographic region structural stress, rock mass formation and mining process to the stability of underground roadway and the horizontal jamb. The details are described as follows:Based on the principles of elasticity and plasticity mechanics theories, we finish an analysis of the stability near the 1150 horizontal jamb in theory and simulate the stress situation and the stability of the rock mass in the mining processes. Through the analysis on the numerical results and the types of the breakages in underground roadway we evaluate the stability and the security of this area and predict the possible breakages in the future. This paper offers a theoretical basis for the construction of the underground roadway near 1178 level and for the mining safety of the horizontal jamb. The research has instructional significance to the corporation's produce plan and decision-making.