Preliminary rib support requirements for solid coal ribs using a coal pillar rib rating (CPRR)
نویسندگان
چکیده
منابع مشابه
Instability leading to coal bumps and nonlinear evolutionary mechanisms for a coal-pillar-and-roof system
This paper studies the unstable mechanisms of the mechanical system that is composed of the stiff hosts (roof and floor) and the coal pillar using catastrophe theory. It is assumed that the roof is an elastic beam and the coal pillar is a strain-softening medium which can be described by the Weibull s distribution theory of strength. It is found that the instability leading to coal bump depends...
متن کاملA practical application of photogrammetry to performing rib characterization measurements in an underground coal mine using a DSLR camera
Understanding coal mine rib behavior is important for inferring pillar loading conditions as well as ensuring the safety of miners who are regularly exposed to ribs. Due to the variability in the geometry of underground openings and ground behavior, point measurements often fail to capture the true movement of mine workings. Photogrammetry is a potentially fast, cheap, and precise supplemental ...
متن کاملComparing the “Modified Split and Fender” and “Shortwall” Methods for the Pillar Recovery in Room and Pillar Coal Mining Using A 3D Finite Difference Modeling in Tabas Central Coal Mine, Iran
Selecting a suitable pillar recovery method is one of the most important issues in the room and pillar mining. The main purpose of this study is to compare two methods for pillar recovery in Tabas central coal mine (TCM). Among the existing methods, the two methods, “Modified split and fender” and “Shortwall” are chosen for the numerical modeling. The three dimensional finite difference method ...
متن کاملStrength Reduction of Coal Pillar after CO2 Sequestration in Abandoned Coal Mines
CO2 geosequestration is currently considered to be the most effective and economical method to dispose of artificial greenhouse gases. There are a large number of coal mines that will be scrapped, and some of them are located in deep formations in China. CO2 storage in abandoned coal mines will be a potential option for greenhouse gas disposal. However, CO2 trapping in deep coal pillars would i...
متن کاملAnalgesia requirements in patients undergoing DIEP flap breast reconstructions: rib preservation versus rib sacrifice.
Figure 1 Intraoperative photograph of a right 2nd intercostal space showing the IMVs successfully anastomosed to the deep inferior epigastric vessels. The distance between the two ribs and thus the space available for the microvascular anastomoses was 19 mm. Internal mammary vessel (IMV) exposure for free-flap breast reconstruction (BR) traditionally entails removal of a segment of the 3rd cost...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Mining Science and Technology
سال: 2021
ISSN: 2095-2686
DOI: 10.1016/j.ijmst.2020.12.006