Mechanical Analysis And Applications Of Arch Support In Mine Soft Rock Roadway

With the increasing complexity of mining and the increase of mining depth,issue on soft rock roadway has become more prominent. Arch support has good contractible performance, large carrying capacity and other characteristics. Adopting arch support strut soft rock, arch support can be adapted to the large deformation properties of soft rock, achieve the purpose of"dealt with gently, allow the buffer pressure, stably supporting", arch support is an effective way of soft rock roadway. In this article, arch support of soft rock mining is studied. The main work includes the following aspects:(1)The soft rock deformation characteristics and failure modes are analyzed. Arch support can support soft rock effectively through analyzing the current support forms on soft rock roadway.(2) The calculation model of arch support is established, and the concrete mechanical analysis on arch support is carried out basing on load-structural model and the power principle. The level reaction of arch support is derived.(3) Contour curves of arch stent are optimized from the perspective of a reasonable arch axis, through theoretical analysis we know : In roadways which bear the pressure of not equal, the best shape on at the top of roadways is oval; For the situation, adopting load-structural model and the power principle, internal force expression of oval support is derived, results of the investigation have certain reference value for the design and engineering application of support.(4) The calculation method of external loads that arch support withstand is introduced briefly. On this basis, Taking the example as a study background, arch supports of roadway are designed by using calculation formula of this article, we design different programs, In addition, the different supporting programs are compared, results of the investigation provide some guidance to arch support in soft rock roadway.(5) Arch supports are optimized in different conditions, we obtain the corresponding conclusions by finite element analysis, These conclusions have certain reference value for the design and engineering application of arch supports.In addition, we find the weak parts of arch supports in the supporting process through the finite element analyze the specific support; Based on the results, we can strengthen these weak parts in practice.