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HAZARD MITIGATION OF THE IMPACT OF A PROGRESIVE TUNNEL COLLAPSE Paper No.114

HAZARD MITIGATION OF THE IMPACT OF A PROGRESIVE TUNNEL COLLA...

ISRM-Sponsored International Symposium on Rock Mechanics:"Rock Characterisation,Modelling and Engineering Design Methods"(SINOROCK2009)

作者： Paul Beetham Robert Hutchison rick lowe Opus International Consultants

The United Kingdom has a long legacy of mineral extraction *** the Nottingham area,these have primarily focused on coal *** local colliery,the 38 ha Gedling Colliery,is to be redeveloped to allow construction of new houses,leisure and retail facilities. Redevelopment of historical collieries pose a number of interesting challenges for today's Engineers ranging from colliery spoil to near surface historical mined *** challenge that is not encountered frequently is the impact of historical tunnels on future developments. The main access road to the new development,which is to be constructed on a 12m high embankment,traverses a historical railway *** question that was posed to the Engineer's was;will the construction of the new access road cause the tunnel to collapse? The ground conditions in the area comprise the Radcliffe Formation of the Mercia Mudstone Group overlying the Sneinton *** formations can be described as interlayered mudstone,siltstone and fine grained *** distinct sets of discontinuities are prevalent in the strata. In order to ascertain the risk of collapse,a number of intrusive and non intrusive investigations were *** nonintrusive investigations comprised:a visual inspection,a delamination survey,a ground probing radar survey from the ground surface and an electrical resistance tomography survey from within the tunnel *** investigations comprised rotary coring of the Mercia Mudstone and of the tunnel lining. Numerical modelling of the proposed development including it's construction sequences was undertaken.A number of discrete models were analysed including 2D boundary and finite element analysis and a 3D stability analysis of the tunnel itself. The findings of the investigation and analysis were that the tunnel 'bore' itself was generally stable but the tunnel lining was in a state of degradation with approximately 11%failed to *** led to the conclusion that far fr

关键词： Tunnel Embankment Finite Element Geotextile Hazard Numerical Mitigation

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