宜宾港铁路采空区选线研究

Research on Yibin Port Railway Alignment Selection in Goaf

为了降低某煤炭采空区对铁路工程的影响,为采空区选线提供合理的建议,采用现场调查、地质钻探及原位测试的方法,查明了矿区工程地质条件及开采现状;根据《建筑物、水体、铁路及主要巷道煤柱留设与压煤开采规程》进行采空区铁路地基稳定性分析,确定了处理深度及宽度;从工程地质、处理范围、防护加固效果及抵抗变形四个方面,对铁路通过采空区的形式及其采取的防护加固措施进行分析。研究表明:(1)路基挖方的形式优于隧道形式;(2)对采空区煤层上覆土层实施卸压,对铁路围护带按68°影响角确定的处理宽度及深度进行注浆加固,可确保铁路安全通过采空区。

In order to reduce coal goaf's impact on railway projects and provide rational suggestions for the railway alignment selection in goaf area,adopt such methods as on-site investigation,geological drilling and in-situ testing to ascertain the engineering geological conditions and mining status of the mining area;analyze the stability of the railway foundation in the goaf and confirm the treatment depth and width in accordance with Regulation on Coal Pillar Arrangement and Setting Coal Mining at Building,Water Body,Railway and Main Roadway;analyze the forms and due protective and reinforcement measures in the goaf area where the route passes from four aspects including engineering geology,treatment scope,protection and reinforcement effect and resistance to deformation. The research shows that:( 1) the form of cutting is better than tunnel;( 2) the railway passing through the goaf area safely can be ensured with pressure relief on the overburden layer of the coal seam in the goaf and grouting reinforcement in the scope of the treatment width and depth determined by the 68°influence angle for the railway retaining strip.