Study On Surrounding Rock Stability And Control Technology Of Large Section Highway Tunnel

The vigorous development of material economy,so that China’s traffic is more and more convenient,from the ground project of highway,railway to the ground project of high-speed rail,light rail,and then to the underground project of subway,tunnel,etc.,China’s traffic network is more and more intensive,human travel more and more convenient.In order to meet the increasing demand of traffic volume and shorten the net distance between regions,the large-section highway tunnel has gradually become the object of national traffic engineering development.For large section tunnel surrounding rock,its span is larger,the tunnel flattening rate is relatively high,its construction difficulty is higher than the medium and small section surrounding rock.Based on a large cross-section highway tunnel in Zhejiang Province,the stability of the surrounding rock of the tunnel is studied by the combination of elastoplastic mechanics analysis,rock test,numerical simulation and field measurement.In this paper,the physical and mechanical parameters of Tuff are measured by means of laboratory tests,and the formulas of the radius and thickness of the loose zone of surrounding rock of large section highway tunnel are derived by means of elastoplastic mechanical analysis,then,the influence of excavation method,lateral pressure coefficient,circulation footage and depth on large section highway tunnel is simulated by numerical simulation.Finally,the support effect is evaluated by field measurement.Figure61 table18 reference80...