No abstract

In order to obtain the characteristics of in-situ stress distribution in ZhuJixi coal mine areas, and provide the powerful basis for the design of the roadway, the typical roadway of Zhujixi coal mine was measured by the hollow inclusion method. The measurement results showed that the maximum and minimum principal stress in the mining area were for nearly horizontal direction, and the intermediate principal stress was for nearly vertical direction; The maximum ratio of the stress was 1.55 by comparing vertical principal stress and the maximal horizontal principal stress, so the mining area was for the high stress area; Through estimating depth of about 950 m of the horizontal and vertical stress, could know the theory results were basically smaller than test results by comparing with the field test results, this showed that the area was given priority to with horizontal tectonic stress, belonged to the Earth dynamical field type. We used the test results to evaluate the supporting effect of the roadway by the theoretical analysis, numerical simulation method.

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 all excellent soft rock drift Jean pressure retaining structure, and has good prospects for widespread application.