Are rock masses homogeneous and continuous?
Are rock masses homogeneous and continuous?
Where RMi is used as a general characterization of rock masses, the size of the ‘sample’ or the volume involved is not related or limited by the excavation constructed. Thus, the rock mass is considered continuous if the ‘sample’ size is not limited by geologic boundaries or other in situ features.
How is rock mass measured?
Measuring mass accurately requires a balance scale. Electronic scales, triple-beam balances or other balance scales measure mass. Basic weight scales like bathroom scales generally do not provide the accuracy necessary for finding mass.
What is the meaning of rock mass?
Rock mass is a matrix consisting of rock material and rock discontinuities. Its characterization and classification aim to determine the rock mass characteristics by assigning values to a set of rock parameters.
What is rock mass structure?
The rock mass is the total in-situ medium containing bedding planes, faults, joints, folds and other structural features. Rock masses are discontinuous and often have heterogeneous and anisotropic engineering properties.
What is rock mass properties?
The properties Em and σcm are the rock mass values of deformation modulus and compressive strength respectively. These designations and parameters are all discussed in detail by Hoek et al. (1995). The terms σ[field], Vp and Vs are the (in-situ) field stresses and P- and S-wave acoustic velocities within the rock mass.
What are heterogeneous rocks?
Heterogeneous rocks are usually of sedimentary origin and consist of relatively stronger and weaker rock alternately with varying thickness. Complex geological formations such as turbidites, flysch and molasses are typical examples of such rocks.
What is rock mass number?
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).
How do I find out how much a rock weighs?
To estimate the quantity, you need to convert the area into cubic feet by multiplying length x width x height. Once you have this number, multiply it by the boulder’s weight per cubic foot, then divide by 2000 to convert this number into tons.
What does rock mass rating mean?
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.
Why do we classify rock mass?
The main benefits of rock mass classifications: Improving the quality of site investigations by calling for the minimum input data as classification parameters. Providing quantitative information for design purposes. Enabling better engineering judgement and more effective communication on a project.