Study On The Law Of Strata Distortion Due To Tunnel Construction With Shield On Harbin

Along with the subway in our country each big city's construction, the shield law construction by its intellectualization, the security and is widely applied to peripheral construction's low influential in the urban subway's construction, but the control shield tunneling causes the surface subsidence technology, was still one of general technical worker scientific research worker universal issues of concern, is also the most important question which the design, the constructors considered。This article take a Harbin subway line project as a background, stood in the Harbin south station to the Institute of Agricultural Sciences sector has carried on the tunnel excavation process the surface subsidence scene observation。Has carried on the detailed observation to the tunnel SK0+294.40-SK1+456.985 scope section, obtains the shield to march forward in the process surface subsidence situation, through the analysis design geological data, the construction technique plan and the surface displacement distortion material, summarized in the Harbin high and cold frozen earth area subway shield good advancement the surface subsidence rule, and carries on the finite element three dimensional kinetic simulator analysis using ANSYS, to analyzed through the computed result and the measured data, has confirmed the numerical simulation operating mode reliability.In the computed result and the actual result tally in the good foundation, periphery the topic in view of this line in three section of different characteristic's geological sections, to affected the stratum deformation primary factor-rigidity reduction coefficient, the note thick liquid pressure, the supports and protections pressure, as well as the different tunnel burying depth has conducted the analytical study, summarized the shield law to cause the rule which the surface distorted, discussed the shield construction to disturb and to cause the influencing factor which to the periphery soil body stress strain the soil body lost. These analytical study for Northeast high and cold areas and the similar geological condition's and so on next Harbin subway design and the construction has provided the technical parameter.