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The Calculation of Target Face Pressures for TBMs in Soft and Mixed Ground Conditions
| 题名： | The Calculation of Target Face Pressures for TBMs in Soft and Mixed Ground Conditions |
| 正文语种： | 中文 |
| 作者： | J.N Shirlaw Zhen Yan Chun Xiao Xiao |
| 作者单位： | Golder ssociates,Singapore Shanghai Tunnel Engineering orporation,Singapore |
| 关键词： | face pressure calculation slurry TBM mixed ground tunneling Singapore Circle Line C855 project |
| 摘要： | As part of Contract 855 of the Circle Line in Singapore,two slurry shield TBMs had to be driven from One North to Farrer Road Station,passing through Buona Vista and Holland Village Stations.The tunnels passed directly beneath a number of buildings.The ground consisted of a constantly varying face of mixed soil and rock grades of weathered Jurong Formation(sedimentary rock)and Bukit Timah Granite.The granite over part of the drives had been metamorphosed into massive gneiss.The boundary between the rock and soil weathering grades in the Granite and Gneiss varied,but could be abrupt.The completely weathered(grade Ⅴ)granite or gneiss at the boundary was granular and permeable in nature,while the overlying grade Ⅵ had a low permeability and was cohesive.The tunnelling conditions therefore varied widely.The basis of the face pressure calculations is presented.With the high groundwater levels characteristic of Singapore,there was a very small margin between the minimum pressure required to maintain face stability and the maximum pressure required to control the risk of slurry escape to the surface. |
| 会议日期： | 20091028 |
| 会议举办地点： | 上海 |
| 会议名称： | 第四届中国国际隧道工程研讨会 |
| 出版日期： | 2009-10-28 |
| 母体文献： | 第四届中国国际隧道工程研讨会论文集 |
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