基于应力与围岩分类的冲击地压危险性评价研究

Evaluation of rock burst hazard based on the classification of stress and surrounding rock

基于山东某矿井复杂多样的地质和开采环境,提出了对冲击地压实行分类评价的技术思路。根据外部应力与巷道围岩相互作用后的围岩结构稳定性及其冲击倾向性,对围岩的冲击危险性和类型进行分类。外部静应力计算时采用倾向"载荷三带"理论模型,动应力计算时采用长壁工作面走向"载荷三带"理论模型,再叠加上构造应力等,实现了外部应力的近似计算;将外部应力作用于不同的围岩结构,结合煤岩体的冲击倾向性,得到围岩的冲击危险性和冲击类型。以此为基础形成的冲击地压分类与评价方法能较准确地反映回采工作面的冲击类型和危险程度,为制定针对性的治理措施提供了较准确的依据。研究成果已经在山东能源集团进行了应用,取得了良好的效果。

Due to the complex and diverse geological and mining conditions of a coal mine in Shandong Province, a method for the classification and evaluation of the rock burst was put forward. The risk and type of the rock burst were evaluated according to the stability and impact tendency influenced by the interaction of external stress and the surrounding rock. The external static and dynamic stresses were quantified using the model of three-zone structure loading. The total stress superposed with the tectonic stress was calculated approximately. The extemal stress acting on the different surrounding rock structure with the impact tendency yielded the rock burst hazard and impact type. The classification and evaluation method of rock burst based on this research accurately reflected the impact type and risk of the mining face, and provided a more accurate basis for the development of the control measures. The research results have been applied in the coal mine of Shandong energy group with good outcome.