某高速公路隧道洞口错落体变形原因与治理措施分析

山区公路建设中,由于隧道洞口位于错落体上,造成隧道施工期间穿越错落体时出现多次冒顶,严重影响工期及施工安全。通过对该隧道洞口变形监测、工程地质条件及有限元数值模拟软件综合分析,研究了该错落体的形成机理、变形特征及变形原因,并在此基础上提出了综合治理措施,有效治理了隧道的冒顶及变形,保证了隧道的最终顺利贯通,从中总结出了薄层及中厚层泥灰岩岩层地段发生错落的影响条件,并提出在隧道洞口位于错落体上时设计施工的注意事项,为业内类似工程提供参考。

Analysis of deformation and controlling measures of a cut slope at a highway tunnel portal with faulted rock mass

During the construction of remote highways,because the tunnel portal is located on the faulted rock mass,roof falling occurs many times when crossing the faulted rock mass during the tunnel construction,which seriously affects the period and safety of construction.Based on the comprehensive analysis of the deformation monitoring,engineering geological conditions and the finite element numerical simulation software of the tunnel opening,the formation mechanism,deformation characteristics and deformation causes of the wrong fall body are studied.Based on this,comprehensive control measures are proposed to effectively control the roof caving and deformation of tunnel,which ensures tunnel holing-through.Moreover,this paper summarizes the conditions of the occurrence of faulted rock mass in the thin layer and thick layer of muddy limestone,and puts forward the precautions for designing and construction of tunnel portal located on the wrong fall body,which provides a reference for the similar projects in the industry.