Research On Construction Monitoring Technology Of Highway Tunnels

As one of the three main factors of NATM, monitoring technology plays an importantrole in the informatization construction and ensure construction safety. Monitoringtechnology includes projects that must be measured such as vault sink,surrounding rockdisplacement,surface subsidence and projects that shoule be measured. This paper based onthe GongShishan Tunnel in LuoYang highway, on the basis of the analysis of displacementvarity and distribution regulation after the tunnel excavation, researched the section settingprinciples, the criterion of the stability of surrounding rock and warning indications. the mainresearch concents in the paper is presented as follows:(1) Reviewed the existing contents and methods of construction monitoring technologyin highway tunnel,summarized the section setting principles, the data processing methodsthe factors and criterions of the stability of surrounding rock in the specifications of tunneldesign and construction;(2) Conducted a quantitative study refers to the section setting principles in theconstruction monitoring technology.Based on the GongShishan Tunnel,collected relevantinformation of the tunnel,using finite element software MIDAS/GTS, established2D and3Dtunnel model respectively,analysis the strain-stress law under different surrounding rockconditions,determined the most unfavorable position and space distribution duringconstruction,provides a scientific basis to determine the monitoring section setting principle;(3) Analysis the actual monitoring data of typical section of the Gongshishan Tunnel,put stress on the analysis of the varity and distribution regulation of the projects that must bemeasured such as vault sink,surrounding displacement and the projects that should bemeasured,it not only reveals the variation of surrounding rock a fter the tunnel faceexcavation,but also ensure the rationality of the section setting,so as to play a reliableguarantee to better play the role of monitoring technology;(4) On the basis of the analysis of simulation results and monitoring data and refers tothe relevant research results, considering the factors as the depth of the tunnel and thesurrounding rock condition, surrounding rock stability criteria and early warning indicationsare put forward,it not only serve the information construction of the tunnel,and verified the reliability of the results of this paper.