Research And Application Of The New Polypropylene Fiber Concrete Bar Shell Bolting Shotcrete Support System In High Stressed Soft Rock Drift

With the mine scale enhance and the mine toward deep level, the problem of the timbering and the maintenance of high stressed soft rock drift is becoming more aculeate. It is the key of the mine toward deep leve and the safety mine. Whether can we solve the problem of high stressed soft rock drift supporting. In theory and in practice, high stressed soft rock supporting is compound form on the whole, however, those common supporting measures can't meet the demand of large deformation in high stress soft-rock drift. It sometimes cost large or can't reach expect purpose. It is no doubt worth studying that how to make good use of support system in high stressed soft rock drifts, in that this support system is advanced and economical.The bar shell bolting shotcrete and support system was studied on the basis of the analysis for the mechanics principle of shell structures. The bar shell bolting shotcrete and support system was a new kind of bolting and shotcrete supporting forms. The technique feature is a kind of specially three-dimensional bar-mat reinforcement. It has very high mechanical property and was applied in difficult drift. But its cost is cheap. It was applied in drift by many kinds of factors and its concrete sprayer layer was easily destructed. So, the new polypropylene fiber concrete sprayer layer was studied on the basis of the bar shell bolting shotcrete and support system has very high value. Because toughness of the polypropylene fiber concrete sprayer layer are higher than those of general one.The new polypropylene fiber concrete bar shell bolting shotcrete and support system was studied on the basis of the bar shell bolting and shotcrete support. The paper discussed wall rock-support theory and method of high stressed soft rock drift. The structure's internal force was analyzed and calculated and the formulas of internal force, displacement, stress was deduced according to the general mechanics theory of the ringent cylindrical shell. The model experiment was done by relying on the industrial test on 120m length broken laneway of south flange of Du Erping mine of Xi Shan power and coal group and the distortion, destruct shape, developmental rule of the supporting system was examined while the stress and strain distributing rule and also the ultimate load were obtained. The calculative model of finite element numerical simulation with computer was established on base of combing the theory analysis with the experimental result. As the result of the numerical calculation the study on the structure was supplementary verified finally. The otherness was making for the optimizing of the design project. At last, the conclusion of numerical calculations proved that ANSYS program is reasonable and creditable. With combination by typical engineering, the construct technical request and the technology were established. It was compared to other supporting method that used commonly in high stressed soft rock drift by locale watching and testing, the technique, economic contrast of the typical drift with the new polypropylene fiber concrete bar shell bolting shotcrete and support system was completed and the social benefit was evaluated.