geoeq 0.0.1

A Python library for geotechnical engineering calculations.

geoeq

A Python library for geotechnical engineering calculations.

geoeq brings common geotechnical formulas into one consistent, validated, and well-documented Python package. It is built for engineers, students, and researchers who want to replace repetitive spreadsheet work with clean, reusable code.

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Status

This is v0.0.1, the first public release. It covers soil property and phase-relationship formulas -- the building blocks for everything else in geotechnical engineering.

Future releases will add effective stress, bearing capacity, settlement, consolidation, earth pressure, slope stability, pile capacity, liquefaction assessment, and more.

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Installation

pip install geoeq

Requires Python 3.9 or later. No external dependencies.

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Quick start

from geoeq.soil import properties as sp

# Dry unit weight from specific gravity and void ratio
gamma_d = sp.dry_unit_weight(Gs=2.65, e=0.72)
print(f"Dry unit weight: {gamma_d:.2f} kN/m3")

# Saturated and submerged unit weights
gamma_sat = sp.saturated_unit_weight(Gs=2.65, e=0.72)
gamma_sub = sp.submerged_unit_weight(Gs=2.65, e=0.72)

# Phase relations
n = sp.porosity_from_void_ratio(0.72)
S = sp.degree_of_saturation(w=0.18, Gs=2.65, e=0.72)
w = sp.water_content(S=0.80, Gs=2.65, e=0.72)
e = sp.void_ratio_from_porosity(0.42)

# Relative density
Dr = sp.relative_density(e=0.60, e_max=0.85, e_min=0.45)

# Atterberg limits
PI = sp.plasticity_index(LL=48, PL=22)
LI = sp.liquidity_index(w=35, PL=22, PI=26)
CI = sp.consistency_index(w=35, LL=48, PI=26)

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What is included in v0.0.1

Soil property and phase-relationship formulas

All functions validate inputs, document units in docstrings, and reference their source methods.

Void ratio and porosity

• void_ratio_from_porosity(n) -- convert porosity to void ratio
• porosity_from_void_ratio(e) -- convert void ratio to porosity

Degree of saturation and water content

• degree_of_saturation(w, Gs, e) -- compute S from water content, Gs, and e
• water_content(S, Gs, e) -- compute w from saturation, Gs, and e

Unit weights

• dry_unit_weight(Gs, e) -- dry unit weight (kN/m3)
• saturated_unit_weight(Gs, e) -- saturated unit weight (kN/m3)
• bulk_unit_weight(Gs, e, S) -- moist/total unit weight (kN/m3)
• submerged_unit_weight(Gs, e) -- buoyant unit weight (kN/m3)

Density

• dry_density(Gs, e) -- dry density (kg/m3)
• bulk_density(Gs, e, S) -- bulk density (kg/m3)

Void ratio from other quantities

• void_ratio_from_water_content(w, Gs, S) -- compute e from w, Gs, S
• void_ratio_from_dry_unit_weight(gamma_d, Gs) -- compute e from gamma_d

Relative density

• relative_density(e, e_max, e_min) -- density index for granular soils

Atterberg limits and consistency

• plasticity_index(LL, PL) -- PI = LL - PL
• liquidity_index(w, PL, PI) -- LI
• consistency_index(w, LL, PI) -- CI

Core utilities

• Validation -- input checking (positive, non-negative, range, fraction, angle)
• Constants -- gravity, unit weight of water, atmospheric pressure
• Types -- Soil dataclass for passing soil properties between functions

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Design principles

• Validated inputs. Every function checks that values are physically meaningful. Negative void ratios, impossible saturation, and bad angles raise clear errors.
• Documented units. Every docstring states what units are expected and returned.
• Traceable methods. Docstrings reference the source formula or textbook.
• No hidden dependencies. v0.0.1 uses only the Python standard library.
• Tested. Every formula is tested against hand-calculated values and textbook examples.

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Roadmap

Version	Scope
v0.0.1	Soil properties and phase relations
v0.1.x	Effective stress, pore pressure, seepage
v0.2.x	Shallow foundations, bearing capacity, settlement
v0.3.x	Soil classification (USCS), SPT/CPT correlations
v0.4.x	Earth pressure, consolidation, slope stability
v0.5.x	Pile capacity, liquefaction, advanced methods
v1.0.0	Stable API, full documentation, examples

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Running the tests

From a clone of this repository:

pip install -e ".[dev]"
pytest

If you only install pytest, tests still run from the project root (see pythonpath in pyproject.toml):

pip install pytest
pytest

The wheel on PyPI does not include the test files; run tests from a source checkout.

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Contributing

The repository is private until around v0.5; it will then be opened for public contributions. Until then, feedback and feature requests are appreciated.

Every contribution should include the code, a test, a documentation update, and a reference for the method.

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License

MIT License. See LICENSE for details.

Copyright (c) 2026 Ripon Chandra Malo