Abstract: The critical technical problems in the process of long distance pipe-jacking in collapsible loose layer are discussed in this paper. The position of the work wells shall be reasonably determined based on the stratum formation, site layout and the position of pipeline, to avoid the interference between ground and underground construction. The structure and size of the work wells shall be determined according to the requirement of the construction techinique and burial depth of the pipes, on the basis of that, the number and spacing of the intermediate station for various construction techniques are optimized and the corresponding calculation for jacking force is carried out based on the spacing of the intermediate jacking station. In addition, the deep foundation treatment along with the displacement and solidification of the mud lubricant mud during the pipe-jacking process are adopted, to eliminate the collapsibility of soil in the pipe-jacking construction area. The long-distance pipe-jacking tunnel construction in the collapsible loose layer could be realized through the above-mentioned comprehensive technical measures.

Key words: Coal mine industrial site, Pipe jacking, Between the relay, Application