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| Deformation mechanism and prevention of floor heave in loess tunnel |
| ZHANG Jian1, LIANG Qingguo2,3, WANG Yonggang1, PANG Xiaochong1
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1. Gansu Provincial Transportation Planning Survey and Design Institute Co., Ltd., Lanzhou 730030, Gansu, China;
2. Key Laboratory of Road &
Bridge and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China;
3. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China |
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Abstract For the longitudinal cracks on the top surface of inverted arch of a loess tunnel which located at Lanzhou South Ring Expressway, the mechanism and development process of the tunnel floor heave were analyzed by means of in-situ deformation monitoring and numerical simulation. Through the observation of the vertical settlement on the top surface of the inverted arch filling, and the simulation results with the focus on the stress of the uneven settlement of the inverted arch, we found the main cause of the cracks was that the tensile stress in the middle of the inverted arch exceeded the tensile strength of the concrete. Combining the analysis results and the actual working conditions, we formulated the construction scheme as locking anchor pipes and reinforced concrete pavement. And the effectiveness of the scheme had been verified in practice. The research results not only guided the field construction, but also provided a basis for optimizing the support system of loess tunnel, and also a reference for similar engineering constructions.
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Published: 07 July 2020
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