نتایج جستجو برای: hoek brown criteria
تعداد نتایج: 306548 فیلتر نتایج به سال:
I agree with Drs. Brunekreef and Hoek that new studies of the health effects of fine particulates are very important (Brunekreef & Hoek, 2006). They have raised a number of important issues regarding the findings in my article on the relationship between PM2.5 and mortality in elderly Californians (Enstrom, 2005). I have addressed their issues by clarifying my published findings and by providin...
Three-dimensional failure analyses of slopes are rather elaborate, and for rock slopes, where the strength is defined by nonlinear envelopes, they particularly intricate. This why many earlier approaches used a linear approximation envelope prior to carrying out stability analysis. avoided in this paper, thanks using parametric form Hoek-Brown criterion. The kinematic approach limit analysis as...
Background. Precise estimation of the glomerular filtration rate (GFR) and the identification of markers of progression are important. We compared creatinine, cystatin, and combined CKD-EPI equations with (99m)Tc-DTPA scintigraphy to measure GFR and proteinuria as markers of progression. Methods. Cross-sectional, observational study including 300 subjects. CKD was classified by (99m)Tc-DTPA sci...
The generalized Hoek–Brown criterion (GHB) is recognized as one of the standard failure criteria in rock engineering and its validity extends to a wide range mass quality. A drawback this difficulty transforming it into an explicit form defining Mohr envelope when strength parameter not equal 0.5. information on functional for full conditions enables implementation classical approaches, such li...
بسته به اینکه مصالح تحت اثر چه توع تنشی دچار گسیختگی می شوند، معیارهای مختلفی برای پیش بینی خرابی مصالح ارائه شده است. برخی از این معیارها تئوری و برپایه تنش های کششی و برخی دیگر بر اساس تنش های برشی هستند. اما سنگ ها اغلب تحت تنشهای بالای فشاری قرار دارند از این رو نیاز به تعریف معیاری مناسب این مصالح می باشد. در حوزه مکانیک سنگ معیارهای مختلفی ارائه شده که یکی از بهترین آنها معیار hoek-brown ...
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