First, determine the unconfined compressive strength (UCS) of the rock. (done by performing laboratory tests on rock samples or by using published data for similar rock types.)
Calculate the rock mass rating (RMR). (The RMR is a commonly used empirical classification system that takes into account factors such as the rock type, joint spacing and persistence, groundwater conditions, and in situ stress state.)
Estimate the allowable bearing capacity using empirical relationships based on the UCS and RMR or equivalent parameters (Allowable Bearing Capacity = (UCS x RMR x 0.5))
Calculating the allowable bearing capacity of rock involves several factors and considerations. The allowable bearing capacity refers to the maximum load that can be applied to the rock without causing excessive deformation or failure. Here are the steps to calculate it:
It's important to note that the calculation methods may vary based on the specific geotechnical standards or design codes used in a particular region. Consulting with a geotechnical engineer or referring to relevant guidelines and literature specific to your location is recommended to ensure accurate and reliable calculations.
Bearing capacity obtained upon determination of ground bearing capacity by any method is divided by safety factor (SF) (qa = qu / SF) so that allowable ground stress is obtained. Safety factor values used in geotechnical engineering typically ranges between 2.5 and 3.5.
Conventionally, We use RMR or Q-Systems so as to put degree of weathering, fracture pattern, aperture/opening of fractures, availability of groundwater, etc... in addition to strength of the rock under investigation. As stated in many articles of rock mechanics, presumed bearing capacity of the specific rock type (as different rocks possess different strength) and we divide the value by factor of safety.
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