RQD From Joint Spacing Calculator
Named Poisson fracture RQD=100(1+0.1λ) e^(−0.1λ), λ=1/mean normal spacing; not observed core-piece RQD, Jv conversion or validated rock mass class. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
A Poisson fracture model relates a mean normal spacing to a model-based RQD estimate.
A Poisson fracture model relates a mean normal spacing to a model-based RQD estimate.1
That estimate differs from RQD measured from recovered core pieces.
When to use RQD From Joint Spacing Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
How to use RQD From Joint Spacing Calculator and understand its results
- Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
- Enter observedMeanNormalJointSpacingsM, callerPoissonFractureBranchVerified, using the field meanings and rules below, then run the tool.
- Read poissonModelRqdPercent. Inspect nested result fields where present, and review unknown records separately from known matches.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedMeanNormalJointSpacingsM | Observed mean normal joint spacings m | list of number | Required |
| callerPoissonFractureBranchVerified | Caller poisson fracture branch verified | boolean | Required |
Require positive mean normal spacings and the independently verified Poisson-branch flag true. Set x=.1/spacing and return 100(1+x)exp(−x) per observation. Very small extreme spacings can produce nonfinite intermediate behavior that the output checks reject.
RQD_model=100(1+.1/spacing)exp(−.1/spacing) Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| poissonModelRqdPercent | Poisson model rqd percent | list of number |
{
"input": {
"observedMeanNormalJointSpacingsM": [
0.1,
0.2
],
"callerPoissonFractureBranchVerified": true
},
"output": {
"poissonModelRqdPercent": [
73.57588823428847,
90.97959895689502
]
}
}Limitations and assumptions
Units, ledger boundaries, survey interpretation and model applicability must be independently established. These summaries do not assign reserve/resource classifications or establish support adequacy, ventilation safety or an operating setting.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Lists and matrices must be dense, without missing cells. Numeric lists allow at most 10000 entries; ordinary string lists allow at most 128 strings of 128 UTF-16 units each; numeric matrices allow at most 128 rows and 128 columns, subject to narrower requirements above.
Alternative or Complementary methods
For a related step, use RMR Rating Calculator: An already assigned RMR component ledger can include unknown ratings. For a complementary comparison, use GSI From RMR Calculator: An empirical RMR-to-GSI relation has an edition and applicability branch.
References
-
RQD From Joint Spacing Calculator — tool.io
Similar or alternative tools
- RMR Rating Calculator
An already assigned RMR component ledger can include unknown ratings.
- GSI From RMR Calculator
An empirical RMR-to-GSI relation has an edition and applicability branch.