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Study on Deformation Control Criteria of Highway Tunnel with Complex Conditions

Author: ZhuChengHao
Tutor: HeChuan
School: Southwest Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: highway tunnel field test deformation control criteria deformation rate
CLC: U456.31
Type: Master's thesis
Year: 2011
Downloads: 68
Quote: 2
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Abstract


At present, the deformation control criteria of tunnel was given a certain control range with normal rock conditions in design specification of highway tunnel. But it was not completely suitable for the practical engineering, especially for the soft rock tunnel with large deformation. This thesis relied on the Guanggan highway which the proportion occupied by soft rock was high. And phyllite with features such as low strength, large deformation and soften when encountered the water was the represents of the soft rock. The whole line suffered bad geological phenomena such as landslide, collapse, karst and so on and across Longmenshan fault which was the seismic fault of 5.12 wenchuan earthquake. This thesis carried out a comprehensive and systematic study on the safety control criteria of Guanggan highway for tunnel construction with complex conditions by using the finite element numerical simulation analysis and field test as research means. The main contents were as follows:(1) The influencing factors were summarized by investigating the safety control criteria for tunnel at home and abroad. The physical and mechanical parameters of different surrounding rock were get by back analysis according to the field monitoring data. Combining with the characteristics of Guanggan highway tunnel, the influencing factors’relevance of deformation control criteria for tunnel was studied on four aspects, including surrounding rock characteristics, buried depth, construction method and section form.(2)According to field monitor data, the phenomenon including primary support cracking and soft rock large deformation were thoroughly analyzed in soft rock tunnel construction. The deformation of surrounding rock and the mechanical behavior of supporting structure were investigated in soft rock tunnel which reinforced support. The deformation law of II-V grades surrounding rock in hard rock tunnel were summarized, which provided the basic data for setting up the deformation control criteria of subsequent tunnel construction.The conclusion which got through the study above was as follows:(1)The influence order of the factors of deformation control criteria for tunnel was:surrounding rock characteristics> buried depth> construction method> section form.(2)It was effective to inhibit the deformation of soft rock tunnel by reinforcing support.(3)Referencing to the design specification of highway tunnel and combining with the characteristics of Guanggan highway tunnels, the allowable displacement safety control criteria and deformation rate safety control criteria for soft and hard tunnels were proposed, and the preset deformation was set up as well.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel observations and experimental > Tunnel construction and use of monitoring > Cave ( the wall rock and lining ) deformation monitoring
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