Hydrothermal Alteration Weakening Factor
Summarize paired laboratory alteration strength changes with both pooled-strength and unweighted paired conventions; retained fractions above one and negative weakening are preserved, not assumed unsafe flanks.
Description
Hydrothermal alteration can change rock strength.
Hydrothermal alteration can change rock strength. Pooling strengths and averaging specimen-by-specimen ratios answer different weighting questions.
Summarize paired laboratory alteration strength changes with both pooled-strength and unweighted paired conventions; retained fractions above one and negative weakening are preserved, not assumed unsafe flanks.
When to use Hydrothermal Alteration Weakening Factor
Use this tool to summarize paired laboratory alteration strength changes with both pooled-strength and unweighted paired conventions; retained fractions above one and negative weakening are preserved, not assumed unsafe flanks.
Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
How to use Hydrothermal Alteration Weakening Factor and understand its results
- Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
- Enter unalteredStrengthsMpa, alteredStrengthsMpa using the field table and calculation rules, then run the tool.
- Read pairedRetainedStrengthFractions, pooledRetainedStrengthFraction, meanPairedWeakeningFraction. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| unalteredStrengthsMpa | Unaltered strengths mpa | list of number | Required |
| alteredStrengthsMpa | Altered strengths mpa | list of number | Required |
Align positive unaltered and nonnegative altered strengths in MPa. Return each ratio, the pooled ratio and unweighted mean weakening. Preserve retention above one and negative weakening.1
Paired lists must be nonempty and have equal lengths.
pooled retention = Σ altered/Σ unaltered; mean weakening = 1 − mean(paired ratios) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| pairedRetainedStrengthFractions | Paired retained strength fractions | list of number |
| pooledRetainedStrengthFraction | Pooled retained strength fraction | number |
| meanPairedWeakeningFraction | Mean paired weakening fraction | number |
{
"input": {
"unalteredStrengthsMpa": [
10,
20
],
"alteredStrengthsMpa": [
5,
15
]
},
"output": {
"pairedRetainedStrengthFractions": [
0.5,
0.75
],
"pooledRetainedStrengthFraction": 0.6666666666666666,
"meanPairedWeakeningFraction": 0.375
}
}Limitations and assumptions
Laboratory pairs do not alone establish slope stability or field-scale weakening.
Numbers and computed results must be finite; overflow produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Lava Tube Roof Thickness Stability Checker: Screen a caller plate-bending lava-tube roof idealization and invert allowable stress to thickness; coefficient depends on support geometry, and hot/cracked roof stability or access safety is not certified. For a complementary task, use Roof Load Ash Collapse Risk Checker: Audit independently measured wet ash loads against caller remaining zone capacities and sum physical ash mass; capacities must account for other loads and this is not a collapse forecast or structural/access-safety certificate.
References
-
Hydrothermal Alteration Weakening Factor — tool.io
Similar or alternative tools
- Lava Tube Roof Thickness Stability Checker
Screen a caller plate-bending lava-tube roof idealization and invert allowable stress to thickness; coefficient depends on support geometry, and hot/cracked roof stability or access safety is not certified.
- Roof Load Ash Collapse Risk Checker
Audit independently measured wet ash loads against caller remaining zone capacities and sum physical ash mass; capacities must account for other loads and this is not a collapse forecast or structural/access-safety certificate.