Abstract:

The polypropylene bar shell bolting shotcrete and support system was studied on the basis of the analysis of the mechanics principle of shell structures. The technique feature is a kind of specially three-dimensional bar-mat reinforcement instead of three-dimensional bar-mat. It has very high mechanical property and was applied in difficult drift without profiled bar, anchor bolt, grouting and so on. The model experiment was done by relying on the industrial test on the broken laneway of Xishan Coal Power Company. The distortion, destruct shape, developmental rule of the supporting system were examined while the stress and strain distributing rule and also the ultimate load were obtained. The application showed that without reducing the carrying capacity of supporting the case, and heavy metal stent compared to the steel supporting the form of reduced consumption and the amount of concrete rebound, and has good flexibility, is an excellent soft rock drift Jean pressure retaining structure, and has good prospects for widespread application.

Key words: soft rock drift, shell bolting shotcrete, polypropylene concrete, compound support, lab test, engineering application