关键词: 鄂尔多斯矿区, 深部开采, 冲击地压, 采动覆岩结构, 防冲技术

Abstract: In recent years, destructive rockburst accidents have occurred in multiple working faces in the deep mining area of the Ordos Coal Base, which has been listed as the main disaster for coal mining in the region, affecting coal output accounting for nearly 1/3 of the total area. Using comprehensive methods such as theory, experiment and actual measurement, the types and mechanism of rockburst are systematically studied, and key countermeasures against erosion are proposed. The results show that: (1) The deep mining area of Ordos has typical conditions such as a large depth, a thick base strata structure composed of multiple sets of hard and thick stratum, a complex coal structure, high-strength mining, and the surface subsidence value is very small. The types of rockburst could be divided into 4 types: geological master control type, engineering master control type, compound master control type, secondary disaster type. (2) Consider the influence of aquifers water drainage in overlying strata, a theoretical model of movement subsidence and separation movement of mining strata was established, on the basis of similar tests and on-site monitoring, and the rockburst failure mechanism of small structure of surrounding rock structure under the influence of large-scale strata structure subsidence and separation movement. (3) Aiming at the typical mining conditions in the deep mining area, the scientific design of rockburst prevention and control and key technical countermeasures throughout the whole process of "before mining, during mining and after mining" was put forward, based on the analysis of the technical principle of reducing the impact of rockburst based on pressure optimization and strain control. Shirawusu Mine and Yingpanhao Mine were successfully applied. Practice shows that the countermeasures taken not only improve the resource recovery rate, straighten out the relationship between mining and continuation, but also achieve the purpose of effective prevention of rockburst, which can provide a reference for the prevention of mine rockburst under similar conditions.