Abstract:Research purposes: The project of the Qiaozhong Road Tunnel in Haikou had the features of complex external environment,tight construction duration and shallow structure etc. According to the project features and the requirement of construction process,the cover-excavation consequent method was used. Combined with this project, the study was done on the characteristics,calculation methods and usability of the three types of columns-steel lattice column,concrete filled steel tube column and reinforced concrete bored pile column. They are commonly used when the cover-excavation consequent method is adopted.
Research conclusions:(1)According to the special demands of the tight construction duration,the geological conditions of shallow buried stratum and depth of foundation pit,the cover-excavation consequent method was used for this project. ( 2 ) The steel lattice column,concrete filled steel tube column and reinforced concrete bored pile column were suitable for this tunnel project. The steel lattice column had the features of simple construction and easy waterproofing treatment for floor plate and low cost,but the vertical bearing capacity was relatively poor.(3)The concrete filled steel tube column had the features of the good bearing capacity and simple waterproofing treatment,but it required the high construction accuracy. ( 4 ) The reinforced concrete bored pile column had the features of the good bearing capacity and simple construction,but the waterproofing treatment was complex.(5)According to specific engineering conditions and construction technology level,the concrete filled steel tube column was used for this project. ( 6)The conclusions could be applied in the underground engineering with the cover-excavation consequent method.
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JI Da-xue,WANG Teng-fei. Analysis of Key Technologies for Design of Qiaozhong Road Tunnel in Haikou. 铁道工程学报, 2013, 30(8): 78-82.
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