# How do you calculate the RMR of a rock?

## How do you calculate the RMR of a rock?

The groundwater rating accounts for 15% of total ratings. The final RMR value of the rock is calculated as follows:(1) R M R = R 1 + R 2 + R 3 + R 4 + R 5 + R 6 where R1, R2, …, R6 are the ratings corresponding to six rock parameters as depicted in Table 2.

**What is RMR in Rock Mechanics?**

The rock mass rating (RMR) is a geomechanical classification system for rocks, developed by Z. T. Bieniawski between 1972 and 1973. Since then it has undergone multiple modifications out of which, RMR89 is commonly used.

### How do you calculate JV in Rqd?

Jv = 1/S1 + 1/S2 + 1/S3 + …1/Sn Eq. (14) where S1, S2 and S3 are the average spacings for the joint sets.

**What is RMR and SMR?**

RMR values are then correlated into Slope Mass Rating (SMR) which is a system of classification of a rock slope. The study showed that the Rajamandala Limestone Mine area has RMR values of 66-71 and included in the class II or Good Rock and SMR ranged between 61° – 72° and belong to Good Slope class.

#### What is rock mass quality?

rock-mass quality (RMQ) A classification of rock for engineering purposes, based on the number of major joints or other discontinuities (planes of weakness) in it, their orientation, and their spacing.

**What is Rqd soil investigation?**

Rock quality designation (RQD) is a standard technique in the mining industry for the qualitative and quantitative assessment of rock quality and degree of jointing, fracturing, and shearing in a rock mass.

## How do you calculate volumetric joint count?

In the cases when mostly random or irregular joints occur the (Jv) can be found by counting all the observed joint within a known area. By assuming that the jointing has a uniform distribution, the (Jv) can be found by calculating the number of joints per unit area and multiplying this with a factor K.

**What is SMR geology?**

Slope mass rating (SMR) is a rock mass classification scheme developed by Manuel Romana to describe the strength of an individual rock outcrop or slope.

### How do you calculate slope with mass rating?

6 Slope mass rating(SMR) : SMR = RMR(b) – (F1 . F2 . F3) + F4 • The SMR is calculated by subtracting factorial adjustment factors of the joint-slope relationship (F1. F2.

**What is the RMR value for good roof condition?**

RMR is determined as an algebraic sum of ratings for all of the parameters. On the basis of RMR values for a given engineering structure, the rock mass is sorted into five classes: very good (RMR 100–81), good (80–61), fair (60–41), poor (40–21), and very poor (<20).

#### What is Q value of rock?

Classification of the rock mass The rock mass quality (Q) is a very sensitive index and its value varies from 0.001 to 1000. Use of the Q-system is specifically recommended for tunnels and caverns with an arched roof.