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Geotechnical constitutive model selection and parameter calibration for Abaqus
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Based on SOC occupation classification
Domain-specific knowledge and Q&A for various engineering fields
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Excavation, tunneling, and staged construction simulation in Abaqus
| name | geotech-constitutive |
| version | 1.0.0 |
| description | Geotechnical constitutive model selection and parameter calibration for Abaqus |
| description_cn | 岩土本构模型选择与参数标定（Abaqus） |
| triggers | ["constitutive","本构","material","材料","mohr-coulomb","drucker-prager","cam-clay","摩尔库仑","德鲁克普拉格","剑桥模型","损伤","蠕变","creep","黏弹","viscoelastic","超弹","hyperelastic"] |
| priority | P0 |
| dependencies | [] |
| author | AbaqusGPT Team |
| tags | ["geotechnical","constitutive","material","calibration"] |
Expert guidance on selecting, configuring, and calibrating constitutive models for geotechnical materials in Abaqus. Covers soils, rocks, soft clays, sands, and engineered fills.
岩土材料本构模型的选择、配置和参数标定专家指导。覆盖土、岩石、软黏土、砂土和工程填料。
*MATERIAL, NAME=SOIL_MC
*ELASTIC
50000., 0.3
*MOHR COULOMB
30., 0.
*MOHR COULOMB HARDENING
0., 0.0
100., 0.05
200., 0.10
*MATERIAL, NAME=SOIL_DP
*ELASTIC
80000., 0.25
*DRUCKER PRAGER
35., 1.0, 10.
*DRUCKER PRAGER HARDENING
200., 0.0
500., 0.02
800., 0.05
*DRUCKER PRAGER
35., 1.0, 0.
*DRUCKER PRAGER HARDENING
100., 0.0
300., 0.01
*CAP PLASTICITY
0.01, 0.5, 0.0, 0.02
*CAP HARDENING
0.02, 50.
0.04, 100.
0.06, 200.
*MATERIAL, NAME=SOFT_CLAY
*ELASTIC
*POROUS ELASTIC, SHEAR=POISSON
0.026, 0.3
*CLAY PLASTICITY
1.0, 1.0
*CLAY HARDENING
200., 1.5
*INITIAL CONDITIONS, TYPE=STRESS
SOIL_SET, -50., -100., -50., 0., 0., 0.
*INITIAL CONDITIONS, TYPE=RATIO
SOIL_SET, 0.8
*MATERIAL, NAME=CREEP_SOIL
*ELASTIC
30000., 0.35
*CREEP, LAW=TIME
1.e-10, 3.0, -0.5
*CREEP, LAW=STRAIN
A, n, m
*MOHR COULOMB HARDENING
100., 0.0
120., 0.02
50., 0.05
30., 0.10
*MOISTURE SWELLING
0.0, 0.0
0.5, 0.03
1.0, 0.08
*ELASTIC
*ELASTIC, TYPE=ISOTROPIC
30000., 0.3, -20.
15000., 0.35, -5.
5000., 0.4, 0.
| 试验类型 | 可标定的参数 |
|---|---|
| 三轴压缩试验 (CU/CD) | φ, c, E, ν, M (Cam-Clay) |
| 固结试验 (oedometer) | λ, κ, Cc, Cs, cv, 预固结压力 |
| 直剪试验 | φ, c (大应变) |
| 无侧限压缩 | qu, Eu |
| 共振柱试验 | Gmax, D (动力参数) |
| 问题 | 原因 | 解决方案 |
|---|---|---|
| Mohr-Coulomb 不收敛 | 屈服面尖角处不光滑 | 改用 Drucker-Prager 或增大步数 |
| Cam-Clay 初始步不平衡 | 初始应力与 OCR 不匹配 | 检查 *INITIAL CONDITIONS 和 *GEOSTATIC |
| 大变形下收敛困难 | 材料参数在大应变下不合理 | 检查硬化曲线斜率，确保单调递增 |
| Cap 模型发散 | 初始帽面位置不合理 | 调整 *CAP HARDENING 初始值 |
土体类型判断
├── 黏土
│ ├── 正常固结/轻超固结 → Cam-Clay
│ ├── 强超固结 → Mohr-Coulomb / Drucker-Prager
│ └── 软黏土长期变形 → Cam-Clay + 蠕变
├── 砂土
│ ├── 静力分析 → Mohr-Coulomb / Drucker-Prager
│ ├── 动力/液化 → Drucker-Prager + 孔压模型
│ └── 填土压实 → Cap 模型
├── 岩石
│ ├── 脆性岩石 → Drucker-Prager + 拉伸截断
│ ├── 软岩 → Drucker-Prager + 蠕变
│ └── 节理岩体 → 等效连续体 + 弱化参数
└── 特殊土
├── 膨胀土 → Cam-Clay + *MOISTURE SWELLING
└── 冻土 → 温度相关参数
# Get model recommendation
abaqusgpt ask "粉质黏土基坑开挖用什么本构模型" --domain geotechnical
# Parameter calibration help
abaqusgpt ask "如何从三轴试验标定Mohr-Coulomb参数" --domain geotechnical
from abaqusgpt.skills.geotech_constitutive import GeotechConstitutiveSkill
skill = GeotechConstitutiveSkill()
result = skill.execute({
"query_type": "model_selection",
"soil_type": "soft_clay",
"analysis_type": "consolidation",
"available_tests": ["triaxial_cu", "oedometer"]
})