铁路采空区工程地质勘察及稳定性评价

Engineering Geological Investigation and Evaluation on Stability of Coal Gob Area for Railway

研究目的:采空区已经成为影响铁路方案的重要不良地质因素,因其工程地质条件非常复杂而对铁路工程稳定性具有重要影响。当铁路穿越采空区时,通过采用综合工程地质勘察方法及运用铁路保护煤柱方法,评价其对铁路的影响,为铁路安全边界范围确定及采空区加固处理设计提供可靠的依据,进而满足铁路工程的沉降控制要求。研究结论:(1)铁路采空区勘察在充分利用煤矿采掘资料的基础上,通过采用物探及钻探的方法进行详细勘测,相互验证,相互补充,综合确定采空区的边界范围;(2)根据勘察揭露煤层埋藏深度,利用空间几何关系,得到煤层的产状;(3)通过综合勘察成果,采用铁路保护煤柱的设计方法评价铁路的稳定性及其安全边界范围,对采空区安全边界范围内采用注浆加固处理,能够满足铁路沉降控制要求;(4)本文可以为类似采空区工程地质勘察及稳定性评价提供一定的指导及参考。

Research purposes： The coal gob area is the unfavorable geological factors affecting the railway alignment. It is very complicated and it plays an important part in the stability of railway engineering. When the railway passing through the coal gob, the evaluation is made on the influences of the railway engineering by the synthetic method of geological investigation and the protective coal pillar design of railway. It can give the reliable bases on identifying the safe borders and reinforcing the coal gob and can further meet the requirements of railway engineering subsidence control. Research conclusions： （ 1 ） Railway geological investigation of coal gob is based on the collected coal mining date. A detailed survey is carried out with geophysical survey and drilling. It can make each other verifying and complement. Then it can identify the border of coal gob. （2） According to the depth of exposing coal seam, the attitude of coal mine can be got by space geometry relation. （ 3 ） By the result of the synthetic method for geological investigation, the evaluation is made on the stability of railway and the safe l^order of coal gob with the protective coal pillar design of rail-way. By goaf grouting reinforcement within the scope of security boundary, it can meet the requirements of railway sub-sidence control. （4） This paper can provide the guidance and reference to similar engineering geological investigation and evaluation on stability of coal gob area for railway in the future.