浅埋房采采空区分布勘察及治理技术

Distribution Investigation and Governance Technology for Shallow Buried Room Mining Goaf

中国榆林等地区采用房柱式开采方法后遗留了大量采空区。随着时间推移,因煤岩体长期风化、蠕变而诱发采空区失稳,产生大面积塌陷、飓风以及矿震等严重灾害。因此,查明房采采空区潜在危险源并进行相应治理具有重要意义。研究了浅埋房采采空区工程地质特征,认为厚表土层薄基岩型房采采空区上覆地层结构分布范围广、危害性大。通过采空区现状调研和EH4大地电磁法勘察技术探明了研究区域内采空区的范围和面积、采空区内积水区以及自然发火区等的分布情况。通过对比分析选取注浆隔离技术进行采空区治理并确定了各项技术参数,预防了采空区灾害的发生。

A large number of goafs were created after room and pillar mining in regions like Yulin in China.As time went by,the longtime weathering and creep deformation of coal-rock mass would induce goaf instability,causing serious disasters such as large area collapse,hurricanes and mine earthquakes.Therefore,it was of great significance to find out potential hazards of room mining goafs and take corresponding governance.This paper studied the engineering geological characteristics of room mining goafs,holding that there was a wide distribution of overlying strata in the thick overburden and thin bedrock type room mining goafs and the potential hazards were great.By investigating the present situation of goafs and by using the EH4 magnetotelluric method investigation technology,the goaf scope and area in the research area and the distribution of water-logged zones and spontaneous combustion ignition regions in the goaf were found out.Through contrastive analysis,the grouting isolation technology was chosen for the goaf governance and all technical parameters were determined.Thus,the occurrence of goaf disasters was effectively prevented.