نتایج جستجو برای: roof rock
تعداد نتایج: 46674 فیلتر نتایج به سال:
When blasting to enhance permeability in deep-buried soft coal mining face with a hard roof whose gas drainage requirement is higher, the charging hole and control (which doubles as hole) are easy be deformed damaged, seriously affecting implementation effect. Combining stratum characteristics of seam surrounding rock, idea arranging boreholes near rock reduce deformation, inspired by end effec...
When a pipe roof is used as pre-support for the surrounding rock in shallowly buried tunnel, accurate prediction of support effectiveness important order to ensure rationality structure design. Based on analysis effects, considering construction time structures and interaction mechanisms between steel pipes rock, we establish calculation model pressure acting each semi-circular boundary. Throug...
Abstract In this study, to figure out the deformation mechanism, a particle flow model was used simulate of surrounding rock in deeply buried entry. The fracture evolution, stress, and porosity process main roof breaking, meanwhile, displacement after entry being excavated were recorded analyzed simulation. results show that breaking is different from ideally elastic–plastic simply supported be...
This paper presents an overview of observed distresses on low slope roofing systems collected for the Building Envelope Life Cycle Asset Management (BELCAM) project. The data include over 14,000 visible distresses from 600 roofs from seven different climatic regions across Canada. The distresses encountered for built up roofs, modified bituminous roofs and a limited number of single-ply roofing...
In order to prevent the multi-dynamic disasters induced by rock burst and roof water inrush in strong coal seams under multi-aquifers, such as is case with 207 working face Tingnan mine considered this study, exhibited characteristics of two types dynamic disasters, namely inrush, were analyzed. Based on lithology predicted caving height roof, contradiction between was light these analyses, an ...
The deformation control of roadways surrounded by rock in the fully mechanized amplification sections extra-thick coal seams is problematic. To analyze failure and characteristics a support frame, as well processes surrounding rock, through theoretical analysis industrial tests, conditions return airway caving face an seam Yangchangwan Coal Mine, Ningdong mining, area were examined. Combined wi...
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