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Strategic Study of CAE >> 2013, Volume 15, Issue 10

Construction optimization of shallow-buried tunnel in gravel strata based on controlling settlement of the crown

1. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310034, China;

2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310029, China;

3. School of Transportation, Southeast University, Nanjing 210096, China

Funding project:浙江省科技厅资助项目(2012C21074);浙江省交通厅资助项目(2012H66);浙江工业大学自然科学基金项目(2011XY024) Received: 2012-09-30 Available online: 2013-10-09 15:42:14.000

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Abstract

The stability of surrounding rock is closely connected with the settlement of the crown during construction of shallow-buried road tunnel in gravel strata. Therefore, simulation analysis of different construction methods was used to get the settlement law of the crown to optimize the project as a goal controlling settlement of the crown and stability of surrounding rock. At the same time, the better method of construction was put forward to analyze different excavation path and stage length. The result showed that the crown settlement easily took place during excavation of shallow tunnel and with different construction methods, the difference of crown settlement was great. It is found that CRD method is the most appropriate for gravel strata tunnel because the crown settlement is lest and the stress releasing is slow and gradual and the stress transfer is more effective than CD method. Compared with site monitoring, the result is more identical. The conclusion can provide the reference for similar engineering.

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