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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
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- Geology (GG)
What is the formula of smr ?
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Rahul kumar Best Answer
SMR= RMR' + (F1 x F2 x F3) + F4 where: RMR' is the RMR index resulting from Bieniawski's Rock Mass Classification without any correction. F1 depends on the parallelism between discontinuity, αj (or the intersection line, αi, in the case of wedge failure) and slope dip direction. F2 depends on the discontinuity dip (βj) in the case of planar failure and the plunge, βi of the intersection line in wedge failure. As regards toppling failure, this parameter takes the value 1.0. This parameter is related to the probability of discontinuity shear strength. F3 depends on the relationship between slope (βs) and discontinuity (βj) dips (toppling or planar failure cases) or the immersion line dip (βi) (wedge failure case). This parameter retains the Bieniawski adjustment factors that vary from 0 to −60 points and express the probability of discontinuity outcropping on the slope face for planar and wedge failure. F4 is a correction factor that depends on the excavation method used. SMR (slope mass rating) uses the same first five scoring categories as RMR (rock mass rating): Uniaxial compressive strength of intact rock, Rock Quality Designation (or RQD), Joint spacing, Joint condition (the sum of five sub-scores), and Groundwater conditions. The final sixth category is a rating adjustment or penalization for adverse joint orientations, which is particularly important for evaluating the competence of a rock slope. SMR provides quantitative guidelines to evaluate this rating penalization in the form of four sub-categories, three that describe the relative rock slope and joint set geometries and a fourth which accounts for the method of slope excavation. SMR addresses both planar sliding and toppling failure modes, no additional consideration was made originally for sliding on multiple joint planes.
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smr= rmr -(f1.f2.f3.) +f4 is not this is a firmula ? i am not understanding its subtractrd or added these adjusment factor
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also we will take a mode of f1 and not of f3?
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SMR= RMR + (F1.F2.F3) + F4 is the correct formula. I suggest you to go through an authenticated website for description not just random Google search. If you will type "smr calculation" on Google then you will get a wrong formula (substraction instead of addition), so go through any reputed website.
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You can see that the adjustment factor F1, F2 and F3 are dependent (related to presence of discontinuity) so they are are in multiplication but F4 is a correction factor which is independent of discontinuity that's why F4 isn't treated like others and is in addition to the whole.
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i want to know F1 ka mode lata hai and f3 ka mode nhi leta ?
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yes, F1 is taken as +ve and F3 is -ve in general cases.
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Aa
no i am asking about mode if we will not subtract anything than smr usually will be greater than109