Study On Supporting Parameteic Rational Optimizing Design And Evaluate Supporting Effect Of Anchor (Cables) Supporting In Road-way

With the development of bolt supporting theory in our country's coal, the technician do a lot of work, accumulate much information and get abundant experiences from supporting theory and practice. Recently pin timbering has been extensive used because the bolting of coal road has mellowed, however the problem of difficult tunnel reinforcement haven't been solved properly, for example, wide span tunnel, heavy section. All in all, whether can we work out the problem is a critical issue for coal exploitation and safety in production.By means of theoretical analysis and field practice, bolt supporting of wide span tunnel is studied wholly and systematically. This paper summarizes the mechanism of destabilization in bolting roadway and supporting theory. Based on generalizing the method which the design of bolt supporting, this thesis study the parameter designing method which about bolt supporting in big section of rectangle tunnel. Through using the way that rectangle roadway equivalent ellipse, to determine the floor of tunnel's plastic zone. On the base of establishing mechanical mode, the paper analysis the wall of tunnel's plastic width. It is based on elastic-plasticity theory of limiting equilibrium. The parameters of bolt supporting are designed after defining the plastic zone. We carried out the practical study on the ground of large span coal that the second Huangling coal. The bolting designs were determined and analysed the stability of bolt supporting by using FLAC2D.By means of field practice, we make multiple monitoring on the support effect in synchronism and analysis the monitoring data by data processing software. We evaluate the support effect and achieve the goal of dynamic design which combined preliminary design and engineering monitor in the light of feedback information optimal design.The paper proposed theory of calculation is fit for supporting designing. It has certain efficiency and usability, and solves some technical difficult problems in the second coal bed of Huangling coal mine well, and supplies the design reference of the similar tunnel return air course support.