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| Analysis of Impact of Construction of Shallow Large-span Tunnels on Environment with Surface Excavation method |
| YANG Hui-jun |
| China Railway Tunnel Group Co. Ltd., Luoyang, Henan 471009, China |
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Abstract Research purposes：The southwest ventilation tunnel of metro has the following obvious features: complex geological conditions and surrounding environment, large span (excavation span accounting for 9.9 m), shallow burying (the cover depth of soil on the tunnel structure accounting for about 10 m), small cover-span ratio (about 1), frequent external loadings on road surface and under-passing the underground pipelines. So it is necessary to monitor and measure the area impacted by the construction to assess the impact of the construction on surrounding environment.
Research conclusions：(1) The final environment control standard is determined and the protection measures for peripheral environment are worked out. (2) The surface deformation can be divided into four stages: micro deformation stage, aggravating deformation stage, slow deformation stage and basically stable stage. (3) The assessments of the safety of the surrounding buildings on the ground and the underground pipelines show that the buildings and underground pipelines are all in safe states. (4) The impact of construction of a shallow large-span tunnel with surface excavation method on surrounding environment is controllable.
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Received: 26 November 2009
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2010, Vol. 27 
