高速公路隧道病害检测与处治技术研究

Research on the Detection and Treatment Technology for Highway Tunnel Defects

高速公路隧道病害问题严重影响行车安全。文章依托厦蓉高速鸡照隧道工程,针对其发生的衬砌开裂、电缆槽下沉、边墙渗漏水等病害问题,首先进行衬砌混凝土强度、隧道内轮廓等检测,然后结合检测结果对隧道病害原因进行分析,并给出了合理的处治方案。结果表明:(1)采用注浆钢花管锁脚以及增设钢筋混凝土仰拱的方法,可以有效提高隧道结构的稳定性;(2)在增设仰拱段设置横向排水管,并结合纵向排水管确保排水通畅;(3)重新浇筑隧道二次衬砌边墙严重变形开裂剥落段,并结合低预应力锚杆及粘贴钢带加固衬砌,可保证二次衬砌与围岩锚固成整体。

The problem of highway tunnel defects has become an unavoidable factor that affects traffic safety.Based on the context of Jizhao tunnel on Xiamen-Chengdu expressway,this paper conducts tests on the lining con⁃crete strength,tunnel inner contour condition in terms of various tunnel defects,such as lining cracking,cable groove sinking and sidewall seepage,analyzes the causes of tunnel defects based on the testing results,and proposes reasonable treatment options:(1)using the foot-locking and grouting perforated steel pipes,and installing additional plain concrete inverted arch or reinforced concrete invert arch to effectively improve the stability of the tunnel struc⁃ture;(2)setting up transverse drainage pipes in the additional inverted arch section in combination with longitudinal drainage pipes to ensure smooth drainage;(3)re-pouring the secondary lining sidewalls with severe deformation,cracking and spalling,in combination with installation of low pre-stressed anchor bolts and steel strips to anchor the secondary lining and the surrounding rock as a whole.These methods can provide certain references for treating the defects of existing tunnels.