Stability Analysis Of Deep Shaft Connecting Chambers And Optimization Of The Construction Program

At present, It's inevitable for old mines and new mines to extend in depth as growing demand for coal in China. As the depth of the shaft increased, the natural geological factors was complexed and disgusted, and combined with the lack of a correct theoretical guidance in current, the design and construction process of deep chambers group is a big blindness. By analyzing the stability of surrounding rock of underground cavern we know that the most significant factor to affecting the stability of surrounding rock is the underground cavern excavation way under certain geological conditions. Therefore,it's significant to study the order of excavation of the underground chambers, in particular, to study the construction of deep-shaft connecting chambers from the perspective of stability of surrounding rock.This paper based on the full investigation of damage phenomena in deep-shaft connecting chambers at Huanghuai, and the comprehensive analysed the previous studies. This paper combined with the auxiliary shaft of Zhuji coal mine in Huainan, simulated different excavation by three-dimensional fast lagrangian method, analysed its impaction on deep-shaft connecting chambers, analysed comprehensively by applying dynamic programming combined with numerical calculation, to seek the best construction programs.This has some reference value for the design and construction of deep-shaft connecting chambers. We have obtained the best construction scheme by dynamic programming theory combining with numerical results. The optimal construction plan for the mine is shaft-West Malaysia the first door-waiting room-Horsehead East-West Power Distribution Room-South Chamber-North Chamber-train control room. Finally, we obtained the distribution of displacement, stress and plastic zone, though them, we found that the maximum vertical displacement of surrounding rock was on the ingate vault, the maximum horizontal displacement occurred on the both sides, the maximum stress occurred in the arch angle position, and the plastic zone Ingate arch in East and West Malaysia 8m 7m head within the door arch. These consistent with the measured results, has some reference value for the design and construction of deep-shaft connecting chambers.