| As the tunnel in China extensive rapid development, more and more new tunnelwill be under existing traffic line. For example, it is difficult to determine the supportparameters and the construction opportunity on primary support. especially in thetunnel portal.In the existing traffic line tunnels, to consider the new tunnel on atransport line to effect, how to utilize all kinds of construction methods, under thepremise of ensuring safety, reduce traffic on both lines of influence, at the same timeto strengthen the study on the failure mechanism of rock strata, and a variety ofsupporting method and rock mass interactions, these jobs are badly in need of solutionat present.Based on the engineering background of Badaling transit line tunnel engineering,to study and to determine the reasonable through under existing railway line, Badalinghighway tunnel excavation construction technology; according to the detection dataanalysis of blasting vibration rule and on existing railway line effect. Existing railway,expressway tunnel deformation and blasting vibration velocity monitoringmeasurement, data regression, by detecting and judging the stability of tunnel;The significance of this paper is to study the stability of surrounding rock oftunnel excavation by blasting, determine the reasonable construction method, theresult of direct services to the economic construction of the capital; vibrationmonitoring of tunnel excavation, determine the reasonable construction method, guidethe subsequent construction on tunnel deformation and blasting vibration velocitymonitoring measurement, data regression analysis, research the stability of tunnel.This research can be applied to the similar tunnel construction。In this paper theconclusion provides a certain theoretical basis and technique guidance forconstruction qing-long bridge tunnel portal section，and it can also be served as areference and experience for the choosing support parameters and constructionmethod on other similar rock tunnel. |
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