DEFORMATION ANALYSIS FOR SHIELD TUNNEL UPPER CROSSING BY CLOSE RANGE LARGE SECTION PASSAGEWAY
HE Meide1，2，LIU Jun3，LE Guiping4，ZHANG Dingli1，WANG Mengshu1
(1. Tunnel and Underground Engineering Research Center of Ministry of Education，Beijing Jiaotong University，Beijing 100044，China；2. Beijing Municipal Engineering Research Institute，Beijing 100037，China；3. School of Civil and Transportation Engineering，Beijing University of Civil Engineering and Architecture，Beijing 100044，China；4. Beijing MTR Construction Administration Corporation，Beijing 100037，China)
Abstract：During the upper crossing construction process in the project of a certain large section pedestrian passageway upper crossing the running shield tunnel of Beijing subway line No.10，the vertical displacements of shield tunnel structure，the horizontal convergence displacements of shield tunnel structure and the vertical displacements of track bad structure were monitored and analyzed. In this section，the minimum distance was 1.97 m and the CRD method of shallow tunneling was applied. The site monitoring results show that：(1) The deformation of existing subway tunnel structure due to the large section passageway construction is mainly resulted from up floating. The vertical displacement of shield tunnel structure varies from －0.10 to 4.10 mm；the horizontal convergence of shield tunnel structure ranges from －0.03 to －1.80 mm；while the vertical displacement of track bad structure is from －0.30 to 2.90 mm. And the deformations of tunnel structure and track bed structure are coordinating. (2) The variations of three monitoring indices are consistent. They all experience four stages，the upward rapidly area，the down abruptly area，the fluctuating decreased area and the later fluctuating stability area. After completing the tunnel face of passageway，the up floating deformation rate of tunnel structure is significantly increased. When grouting from the floor of passageway，however，it is obvious that grouting controls the up floating deformation of tunnel. When the grouting is completed，the up-floating deformation rate of tunnel structure becomes flat. After the secondary lining of passageway is completed，the tunnel overall is sinking with fluctuation because of the load above shield tunnel increase，and finally reaches stable. The analysis result of this project shows that grouting from floor of passageway can significantly control up floating，which can be applied in the similar projects.
贺美德1，2，刘 军3，乐贵平4，张顶立1，王梦恕1. 大断面通道近距离上穿盾构隧道引起的变形分析[J]. 岩石力学与工程学报, 2014, 33(S2): 3682-3691.
HE Meide1，2，LIU Jun3，LE Guiping4，ZHANG Dingli1，WANG Mengshu1. DEFORMATION ANALYSIS FOR SHIELD TUNNEL UPPER CROSSING BY CLOSE RANGE LARGE SECTION PASSAGEWAY. , 2014, 33(S2): 3682-3691.
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2014, Vol. 33 
