Li Bangxiang, Zhang Youliang, Liu Hao, Wang Zhiqing, Zhao Hongbo
School of Civil Engineering and Geomatics, Shandong University of Technology, Zibo, 255000, People's Republic of China.
College of Civil Engineering and Architecture, Hainan University, Haikou, 570228, People's Republic of China.
Sci Rep. 2025 Mar 26;15(1):10413. doi: 10.1038/s41598-025-94955-6.
Constitute model calibration and their parameter determination are essential to scientifically and accurately characterize soil mechanical behavior. However, this is a challenging task due to the complexity of the geomaterials in geotechnical engineering. This study developed a novel model parameters determination framework combining simplicial homology global optimization (SHGO) and triaxial compressive test. The triaxial compressive test was utilized to generate and record test data, which characterize the constitutive law and cover the mechanical behavior. SHGO was employed to capture the mechanical and failure mechanism by minimizing the discrepancy between the test strain-deviatoric stress curve and that predicted by the hardening soil (HS) model using the unknown model parameters. The developed framework was verified and illustrated by a synthetic example based on the HS model. The results show that the determined strain-deviatoric stress curve is in excellent agreement with the test curve. SHGO performed excellently during the determination of model parameters. Then, the developed framework was applied to an actual triaxial compressive test. The results conclude that the developed framework provides an excellent way to calibrate the model and determine its parameters using optimal technology based on test data. The developed framework provides a scientific, reliable, and promising framework for geomaterials' parameter determination and model calibration.
本构模型校准及其参数确定对于科学准确地表征土力学行为至关重要。然而，由于岩土工程中岩土材料的复杂性，这是一项具有挑战性的任务。本研究开发了一种结合单纯形同调全局优化（SHGO）和三轴压缩试验的新型模型参数确定框架。利用三轴压缩试验来生成和记录测试数据，这些数据表征本构定律并涵盖力学行为。通过使用未知模型参数最小化测试应变 - 偏应力曲线与硬化土（HS）模型预测曲线之间的差异，采用SHGO来捕捉力学和破坏机制。基于HS模型的一个综合示例对所开发的框架进行了验证和说明。结果表明，所确定的应变 - 偏应力曲线与测试曲线非常吻合。在模型参数确定过程中，SHGO表现出色。然后，将所开发的框架应用于实际的三轴压缩试验。结果表明，所开发的框架提供了一种基于测试数据使用优化技术校准模型并确定其参数的极佳方法。所开发的框架为岩土材料的参数确定和模型校准提供了一个科学、可靠且有前景的框架。
