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Geological Engineering: Proceedings of the 1st International Conference (ICGE 2007)
Baosong Ma
Baosong Ma
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The paper reviews the present research situation concerning the soft rock tunnel projects first; then combined with a certain derivation tunnel project in soft rock area, the related problems about the design and construction of the tunnel project are studied and analyzed. The tunnel design includes two stages, namely preliminary design stage before construction and re-designs stage (also called information feedback design) during construction, and the construction of tunnel should be conducted to meet the requirements of design, the safety and economical efficiency. From the viewpoint of New Austrian Tunnel Method (NATM), the two aspects of problems for tunnel design and construction are studied and some ideas are raised. At preliminary design stage, the studied tunnel is designed both by empirical and theoretical design methods, during construction, the re-design is conducted based on in-situ conditions. For such tunnel alignment section where the tunnel pass through the gullies with lower overburden, in order to meet the requirement of tunneling construction, tunnel contour is changed from horseshoe to circular cross section and the support measures are strengthened. During construction, the control blasting and optimization of support method are applied and a good result has been achieved. In the end, conclusions and suggestions about tunnel design and construction in soft rocks are drawn.

Geology Situation for Case Project
Tunnel Design for Support Structure
Construction of Soft Rock Tunnel
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