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Discussion on the mechanism of ground improvement method at the excavation of shallow overburden tunnel in difficult ground

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Underground Space 2016年第2期1卷 94-107页

作者： Kiyoshi Kishida Ying Cui Masaichi Nonomura Tomomi Iura Makoto Kimura Department of Urban Management Kyoto UniversityKyoto 615-8540Japan Department of Civil Engineering Meijo UniversityNagoya 468-5802Japan Railway Engineering Co.Ltd. Tokyo 105-0012Japan Japan Railway Construction Transport and Technology AgencyYokohama 231-8351Japan Department of Civil and Earth Resources Engineering Kyoto UniversityKyoto 615-8540Japan

Tunnel construction opportunities involving shallow overburdens under difficult(e.g.,soft,unconsolidated)grounds have been increasing in *** auxiliary methods for excavating mountain tunnels have been developed and can satisfy stringent construction *** ground improvement method,which is one of the auxiliary methods for shallow overburden tunnels,has demonstrated its ability to effectively control the amount of settlement under soft ***,the mechanism of the ground improvement method has not been clarified,nor has a suitable design code been established for ***,because the strength of the improved ground and the suitable length and width of the improved area have not been fully understood,an empirical design has been applied in every *** this paper,the mechanical behavior during the excavation,including that of the stabilized ground,is evaluated through trapdoor experiments and numerical *** addition,the enhancement of tunnel stability resulting from the application of the ground improvement method is discussed.

关键词： Auxiliary method shallow overburden Soft ground Ground improvement Settlement

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EPB Shield Tunneling for Twin Tunnels with shallow overburden under Railway in Operation

EPB Shield Tunneling for Twin Tunnels with Shallow Overburde...

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地下交通工程与工程安全——第五届中国国际隧道工程研讨会

作者： Yuichiro Terada Tadahiko Tuji Facilities Engineering Department Railway Management DivisionKeio Corporation Civil Engineering Department Obayashi Corporation

＜正＞Keio Line is an important part of the main railway in Tokyo Metropolitan rail transportation *** mitigate traffic congestion as well as to avoid potential traffic accidents railway crossing with roads on the ground,a project for underground double-track railway and underground stations was planed and has been under construction near Chofu Station. Two parallel tunnels were constructed in the project,in which existing railways on ground level will be shifted into the underground parallel *** EPB TBM（6.85m outer diameter） was used for both first and second tunnel *** TBM was turned around in a vertical shaft after the first tunnel driving,and then launched from the shaft for the second *** TBM driving was executed under the following special conditions;1) TBM driving beneath existing railway with shallow earth cover（the minimum earth cover is 4.7m that is less than the outer diameter of tunnel lining）,2) the ground bored by TBM which is mainly composed of the Tachikawa gravel formation containing boulders which is over 300mm,3) small clearance between the parallel tunnels （the minimum clearance was 400mm）,and 4) rotation and lift-up of the TBM in the narrow shaft beneath existing railway after the first tunnel driving（a weight of TBM was approximately 300ton）. Fuda station is constructed by cut and cover tunnel *** ground soil up to the tunnels was excavated in the station area first,and then,the tunnel linings were partially cut and removed to construct platform at the track level of the station. This paper summarizes the overall project and reports regarding the countermeasures against above mentioned conditions and the method of the platform level construction with cut and removal of the tunnel linings in Fuda station.

关键词： TBM driving beneath existing railway in service shallow overburden small clearance between tunnels rotation and lift-up of TBM partial cut and removal of the tunnel linings

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