煤矿安全2025，Vol.56Issue(5)：40-54,15.DOI:10.13347/j.cnki.mkaq.20250237
基于应力分阶作用机制的煤岩瓦斯动力灾害特征分析
Analysis on characteristics of coal-rock gas dynamic disasters based on stress grading action mechanism
摘要
Abstract
With the gradual depletion of shallow coal resources,coal mining in China gradually extends to the deep.With the in-crease of buried depth,the stress state will change and the type of stress field will also change,which makes the internal stress distri-bution of coal and rock show a hierarchical grading trend.This stress classification results in the difference of physical and mechan-ical characteristics of coal and rock as well as the environment of gas occurrence and migration,thus affecting the occurrence charac-teristics of coal and rock gas dynamic disasters.In order to analyze the effect of stress grading on coal gas dynamic disaster,the mechanism of stress grading is reviewed.The results show that the stress state changes under the effect of stress gradation,which leads to the different development degree and failure state of tectonic coal,and the tectonic coal seam with higher failure degree tends to develop towards the state of hydrostatic stress.When the pores in coal are at the critical depth,the pores and micropores are more developed,the pore specific surface area and pore volume are larger,and the crack direction also changes from horizontal to vertical,which affects the permeability of coal seam and the migration path of gas.The gas content increases first and then decreases with the increase of burial depth.With the deepening of depth and the change of lateral pressure coefficient,the shape of the outburst cavity changes from semi-elliptical to butterfly shape.The different stress states in shallow and deep areas also change the dynamic disaster form of coal,rock and gas.Based on the above research,this paper puts forward the idea of disaster zone management that the shallow part is dominated by gas extraction,and the deep part is coordinated by unloading energy dissipation and gas extraction.In the future,it is necessary to think about how to improve and practice the pressure-relief energy dissipation medium modification collaborative technology system to effectively reduce or avoid coal,rock and gas dynamic disasters caused by stress changes,so as to cope with the challenges brought by deep coal seam mining.关键词
煤岩瓦斯动力灾害/瓦斯抽采/深部开采/应力分阶/影响机制Key words
coal-rock gas dynamic disaster/gas drainage/deep mining/stress grading/influence mechanism分类
矿业与冶金引用本文复制引用
赵伟,李泽鑫,赵丹,周爱桃,臧杰,裴雄飞..基于应力分阶作用机制的煤岩瓦斯动力灾害特征分析[J].煤矿安全,2025,56(5):40-54,15.基金项目
国家自然科学基金资助项目(52374250,52130409) （52374250,52130409）
国家重点研发计划资助项目(2023YFC3009000) （2023YFC3009000）
