Application Research Of The Excavation And Support System Of Entire Subsurface Excavation Method And Cross Interchange Station In Shenyang Metro Construction

As the Social and economy's continuously rapid development and the growing scale of ShangYang City,it is in a crucial motorized development stage of urbanization and winding, when traffic is rapidly growing and the pressure is getting more severe. In such situations and background, the communications construction planning has been proposed in Shenyang City,which is established by a network consists of 11 subway lines, "four horizontal lines, two columns , two L shapes, and a chord shape". The total length is about 400 kilometers.In this planning there is about 35 or more cross interchange stations, most of which are in the downtown traffic.For the protection of the city traffic and surrounding environment,the open cut method normally can not be used in these stations, so the covering excavation method and entire subsurface excavation method can be adopted in most of these cases. How to implement the cut and support of the cross interchange stations safely and efficienly and reach the passage goal of the subway station , will be of greatly difficulty. The QingNanDaJie station is one case, which is on the cross point between Subway One that is in construction and Subway Two that will be constructed. It's is one of the most largest subway station that constructed by entire subsurface excavation method in China now. It's large in size and complex Structurally. Because of the local badly geologic conditions and higher surrounding environment standards ,the construction technique is very difficult and there is no experience of Subsurface Excavation Method for reference in ShenYang Metro.For the above questions, Combinated of the QingNianDaJie Station instance,these major study has been carried out as below:1. the comparative analysis and preferring to the excavation and support method of the entire subsurface excavation method and cross interchange station.2. In the geological condition consisted of sand and gravel, the general guiding ideology, the key technology shall be studyed to implement the entire subsurface excavation method and cross interchange station in ShenYang by PBA and CRD method. It will also be analysised in it's stability, economy, environment impact , social benefit and so on.3. Extended to the soil conditions,it shall be researched into the application of the PBA anf CRD construction method.4. It shall be analysised to the prospect of the entire subsurface excavation method and cross interchange station in ShenYang Metro.