公路隧道受下卧煤层采动影响预测及对策研究

A study on the prediction of the influence on a highway tunnel by the excavation of an underlying coal bed and the corresponding countermeasures

文章针对华蓥山隧道受下卧煤层采动影响这一典型的近接施工问题,在国内外研究成果和国家现有规程的基础上,利用计算机数值模拟手段分别按地层结构模式从隧道的横向和纵向,对不同的压煤高度和不同的开采方法进行了影响预测。在此基础上,重点对隧道结构纵向受力特征进行了分析,研究其内力与压煤高度及不同开采方法之间的关系,从而寻求最大限度地减少压煤量,既充分利用煤炭资源,又确保结构安全。

The paper is concerned with the typical problem of the approaching construction in relation to Huayingshan tunnel which will be influenced by the exploitation of the underlying coal bed. Based on the worldwide research achievements and existing regulations of our country, adopting numerical simulation method and considering the strata structure, the paper carries out the predication of the influence caused by the different un-excavated heights of the coal bed and different excavation methods in both transverse and longitudinal directions of the tunnel. Based on this, analysis is carried out for the behavior of the tunnel structure mainly in the longitudinal direction, studying the relation between the internal forces in the structure and the un-exploited heights and various exploitation methods, thereupon to reduce the un-exploited quantity of coal and to guarantee the security of the tunnel structure.