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《China Civil Engineering Journal》 2014-11
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Field measurement of stresses and safety evaluation of eight-lane framed lake tunnel with the cut-and-cover method

Wang Shuying;Yang Junsheng;Tang Peng;Ma Yuhui;Wang Wentong;Central South University;The Third Railway Survey and Design Institute Group Corporation;China Railway 24th Bureau Group Co.,Ltd.;Shenzhen Municipal Design & Research Institute Co.,Ltd.;  
Since its maximum span is 38. 5m,Fangxing Lake tunnel with two-way eight lanes in total is a cut-and-cover framed tunnel and has the largest span in China so far. In the present work,the pore water pressure right below the tunnel cushion,stresses at the top of anti-uplift piles and stresses in the tunnel structure were measured on site. With the back-filling process of soils to tunnel side walls,a sharp increase in the pore water pressure right below the tunnel cushion and an obvious decrease in the local stresses of tunnel floor could be observed. In the meanwhile,the stresses in the external sides of left and right walls generally increased,while the stress fluctuation in other locations was not obvious. During the back-filling process of soil to the tunnel roof,an adequate increase in stresses in other structural locations can be monitored except for no obvious changes in stresses at the internal sides of the tunnel walls. Once the water was recovered to the lake,only the hydrostatic pressure was observed in the soil below the tunnel cushion,and only the mid-span piles of left and right tunnels might resist a part of tensile stresses,and as a result,it is recommended that the improved design should be given for the anti-uplift piles in the future identical projects. Compared to the other structural locations,the structural floor and left and right side walls may resist higher structural stresses,but with the tunnel structure satisfying the safety specifications.
【Fund】: 国家自然科学基金青年资金(51208516);; 国家科技支撑计划课题(2012BAK24B02);; 中国博士后科学基金(2014M550424)
【CateGory Index】: U459.5
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