公路隧道穿越陡倾煤层采空区力学特性分析

针对隧道穿越陡倾煤层的施工力学特性,采用数值计算方法,探讨隧道施工对采空区围岩变形和受力的影响,结果表明,围岩应力分布规律受采空区影响显著,陡倾煤层采空区前后15 m为隧道施工过程中加强支护和重点监测范围。通过分析陡倾采空区对隧道结构的影响程度和规律,发现采空区的存在使得隧道支护结构主应力最大值增大约15%~20%,对隧道整体结构的稳定性不利。

Analysis of Mechanical Properties of Highway Tunnel Through Goaf of Steep Coal Seam

Aiming at the construction mechanics characteristic of tunnel crossing steeply inclined coal seam,the influence of tunnel construction on surrounding rock deformation and stress of the goaf is discussed by means of numerical calculation.The results show that the stress distribution of surrounding rock is significantly affected by the goaf.A range with 15 m before and after the goaf of steeply dipping coal seam is the area for strengthening support and key monitoring during tunnel construction.The influence degree and law of steep goaf on tunnel structure are analyzed.The goaf makes the increment of maximum principal stress of tunnel support structure reach about 15%~20%,which is unfavorable to the stability of the whole tunnel structure.