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| Research on Reinforcement of Foundation in Coal Mine Goaf for Guangxi Coastal Railway |
| WEI Yao - hu |
| Nanning Branch of China Railway Eryuan Engineering Group Co. Ltd, Nanning, Guangxi 530022, China |
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Abstract Research purposes： Aiming at the situation that the coal mining goaf existed in upgrading of the railway in the Nanning - Qingzhou section of the Guangxi coastal railway, the discussion was made on the design method for reinforcing the goaf with grouting. In this paper，the introduction is given to the determination of the grouting scope，the drilling space arrangement, the choice of slurry and the treatment methods for the common problems happened in the construction，and the ideas are given out on building railway in the goaf to provide the reference to the similar works.
Research conclusions ： (1) As the slurry permeated, split and compacted into the holes and cracks in the goaf, the concretions were formed in the bending crack and fissure zones when the boring grouting was used. In this way, the foundation strength was improved effectively and the settlement and stability requirements of the railway foundation were met. (2) The dynamic design was used for treatment project and the project was divided into two stages. The first stage included the exploring and pouring of the combined holes, the holes, curtain grouting holes and the test section. The second stage included the exploring and pouring of the II and HI holes according to the parameters of the first stage. This design scheme was proved feasible. (3) The design and construction of this project can provide the guidance and reference to similar reinforcement projects in the future.
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Received: 15 March 2013
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2013, Vol. 30 
