Analysis And Appraisal Of The Surrounding Rock Stability In The Yumujianggou Double-arch Tunnel

The double-arch tunnel is along with the new great spantunnel form which the our country highway construction rapiddevelopment but proposed, its linear smooth, area few, spatial usefactor high, has avoided the doorway roadbed or bridge minute, theline connection is convenient with the hole outside;Meanwhile in theadaptation to the ground condition, the environmental protection aswell as the project quantity all has the superiority. But thedouble-arches tunnel excavation span in a big way, constructionworking procedure many, excavates and supports and protectsinterlocks mutually, the surrounding rock stress variation and thelining work load transform extremely complex, especially center thewall stress, presses, pulls, is curved, turns, cuts has. Moreover inthe construction process the surrounding rock stress distribution, aswell as the lining work stress distortion condition is not clear about,about the tunnel construction with difficulty to the center wallinfluence grasped, increased the tunnel construction distortion andthe stable control difficulty, had slightly carelessly, can create thelandslide.The Yumujianggou double-arch tunnel as the Jilin Province firstdouble-arch tunnel, belongs to the shallow submersion tunnel, alsoin the about guide hole construction process, is very easy to havethe bias, creates the tunnel surrounding rock pressure the heavydistribution, causes the lining work stress distortion as well asgrasps with difficulty to the center partition wall influence, and safelyincreased the difficulty for the tunnel construction. Therefore, andadopts reasonably to the tunnel surrounding rock correct appraisalsupports and protects the measure to appear especially importantly.The full text mainly has the introduction, the double bondarches the tunnel construction technology, the scene monitoringgauges and experiments the achievement, the monitoringachievement to the tunnel surrounding rocks table appraisal, thetunnel surrounding rock value simulation analysis and so on fivepartial compositions. The introduction and tunnel constructiontechnology system introduction this article has studied the goal, thesignificance, the domestic and foreign research present situation,the research content and study the tunnel the design and theconstruction technology. The scene monitoring gauged andexperiments the achievement partially to introduce its significanceand the importance, narrated the surrounding rock to restrain in thedistortion monitor, the surrounding rock moves monitors, the surfacedisplacement monitors, the surrounding rock pressure monitor,surrounding rock monitor achievement and so on elastic waveexperiment and load experiment, and has carried on the analysis tothe monitor achievement, proposed the surrounding rock distorted,the stress rule and the characteristic. And has carried on theanalysis using the elastic wave experiment achievement to thetunnel surrounding rock loose circle. The monitoring achievementpartial first introduced to the tunnel surrounding rock stabilityappraisal the highway tunnel design standard to the surroundingrock graduation method, and unified the scene engineering geologyreconnaissance, the elastic wave experiment and its the loadexperiment has carried on the graduation regarding theYumujianggou tunnel adjacent formation, and when comparisondesign graded has carried on the rationalization proposal. Next andto restrains the monitor obtained data to carry on a Yuan linearityregression analysis, obtains each kind of surrounding rock torestrain the distortion -time curve equation, and from this obtains itsdistortion speed -equation of time and the distortion acceleration -equation of time. Utilizes the above two equations and its the curveresearch surrounding rock in excavates supports and protects afterthe distortion rule, the stable tendency and finally the settling time,and from this computation surrounding rock final deformation, finallydistinguished supports and protects rational and surrounding rockstability. The surrounding rock value simulation analysis partiallyintroduced through the establishment hole surrounding rock geologymechanics model, the use finite element value simulation, afterexcavated the tunnel surrounding rock stress distribution, thesurrounding rock displacement has carried on the analysis.And has carried on the district using the stress concentrationfactor to the adjacent formation, determines the surrounding rockthe stress distribution rule, thus unifies moves distinguishes thesurrounding rock the stability. The paper finally has carried on thesummary to the front five partial research achievements, obtainsarches the tunnel surrounding rock distortion stress rule and its thecharacteristic in the Yumujianggou double-arch tunnel, has carriedon the appraisal to its stability, and proposed some rationalizationproposals.The findings indicated arches the tunnel regarding theYumujianggou company the monitoring gauging and the finiteelement numerical analysis research results may use in not merelyin the Yumujianggou company arching the tunnel directly theconstruction, guarantees arches tunnel construction period in theYumujianggou company security and economical rationality.Moreover arches the tunnel to other similar double bonds to carry onthe correlation aspect the research also to have the certain theorysignificance and the important reference value.