The Research Of Caverns Location Impact On The Rock Stability And Governance

Base on Huo Yong Expressway tunnel projects. By means of geological radar detectionand excavation verification and according to geological radar detection principle， studied thecaverns features on radar detection reflectivity image. Through the study of existing theoriessuch as: underground engineering surrounding rock theories， underground engineeringsurrounding rock stability classification methods， stability evaluation of karsts， tunnelcaverns amelioration principle and using numerical simulation analysed the karst caveslocation influence of tunnel surrounding rock stability. Combined with field monitoringmeasurement and tunnel caverns amelioration principle， study effect of grouting processingon the surrounding rock stability. Get some directly research results that can be applied toengineering practice or theory reference. The main contents are as follows:（1）When use geological radar to detect rock caverns， appropriate antenna andappropriate instrument parameters， reasonably arranged of survey lines， reflectioncharacteristics of karsts and deep groove presents on radar waves and verification of theresults of radar detection.（2）According to karst caves stability evaluation method， using finite element analysismethods， simulated cave located beneath the tunnel floor， directly above tunnel vault andon the right side of the wall. Analyzed surrounding rock displacement and the force of tunnellining. Based on rock dispersions pressure theory and rock joint action theory， analyzed thereason of change of surrounding rock displacement and the force of tunnel lining.（3）Based on principles of management of tunnel cave and reference to past projectexamples， discuss options to deal with cave surrounding tunnel under the project conditions.And analyze the mechanism of reinforcement scheme adopted to karsts region.