Study On Goaf Investigation And Engineering Suitability Of Wulong Channel Tunnel In Daning Railway, Shanxi

The underground goaf such as coal bed will restrict badly engineering construction ,because it has existed for a long time and was picked unordering ,also the distributing location is not clear. So finding out the location clearly ,and having a appraising of engineering suitability based on it, will have an important guiding signification.Based on the investingation and some study methods of the stability on the goaf, the paper has the goaf of the first and second tunnels of Wu Long channel on coal mine railway leased line in Da Ning of Shanxi Province as an example, according to the engineering geological invesitigation and maping in the earth's surface ,also combining the visit on the relate people, firstly has a geological judge on the space extend of the mostly ledges which have been picked; then adopts the instrument of engineering surveying and checking (for short SWS )which is relatively advanced inside and outside to test by surface wave the rockmass and solid near the middle line of the tunnel (total forty meter), and has a relatively exact judgment on the place that the goaf impossible reveal; lastly passing the validate by drilling, it make clear that the results which tested by SWS is reasonable and believable, based on finding out clearly the space extend of the goaf, the author makes a relatively systemic study on the stability of wall rock around the goaf. Practically the author has a numerical value simulation of finite element by taking the great currency finite element software-ANSYS, and considering separately the character of change in the stress and strain and so on of the wall rock above the roof of the goaf according to the different stride (four meters, eight meters.twelve meters, sixteen meters, twenty meters), the author has an analysis of the stability of wall rock above the roof of the goaf, and considers that the safety thickness of the wall rock above the roof of the goaf will increase along with the addition of the stride, and also think that when the stride equals to or be greater than twelve meters, the most effected thickness of the wall rock above the roof of the goaf will be over ten meters. Lastly according to the result of analysis and combining to the instance that the goaf extend practically, the author makes an evaluation to engineering suitability of the first and second tunnels of of Wu Long channel on coal mine railway leased line in Da Ning of Shanxi Province, which is to be built in the future.