Citation

Wang H, Jia Y, Cao L. Energy Procedia 2012; 16(Pt A): 259-264.

Copyright

(Copyright © 2012, Elsevier Publishing)

DOI

10.1016/j.egypro.2012.01.043

PMID

unavailable

Abstract

The cause analysis of complex soft terrain collapse and the accordingly reasonable solutions, ensuring the safety of personnel and the environment protection during tunneling are the common concerns in civil and environment engineering. Associated with the soft terrain collapse in the Xinkailing tunnel, after the cause analysis and geological and environmental experts studying together, the reasonable and effective measures have been taken; and the effectiveness of prevention has been evaluated by means of the three dimensional deformation measuring with non-contact total station and the finite element numerical analysis. This research shows that the main causes are the poor geological parameters, the poor discrimination of geological environment and the groundwater erosion, etc. It is the key points to reduce collapse that the good description of tunnel face, timely analyzing and predicting the geological condition at the front of surrounding rock of tunnel face, ensuring accurate judgment of the surrounding rock classification and the meeting of strength requirement of supporting parameters. And it is the effective means that strengthened supporting in collapse impacting area, closing of surrounding rock of collapsed body, enhancing the supporting strength in collapsed area and having it done timely, filling the collapsed cavity. After the treatments,the ultimate arch crown vertical displacement of surrounding rock and primary support in collapsed area is about 17.8mm,the safety factor of primary support structure at side wall is about 3.1, and it meets the specifications. In conclusion, it is proved that the treatments are safe and effective, authentic, offering the reference for alike tunnel design and construction in future.

Language: en