结构性黏土模型在FLAC中的二次开发及应用

摘要

FLAC is widely used in rock and geotechnical engineering.Currently FLAC provides only a few constitutive models,which limits its range and accuracy of application.Based on the developing platform provided by FLAC,a bounding surface plasticity model for structured clays is implemented into FLAC under the FISH environment.Firstly,the key techniques and method of implementation are introduced with the basic principles of bounding surface model.In order to evaluate the accuracy of the model implementation under different stress paths,the numerical tests of different conventional laboratory tests on single element are performed and compared to the results obtained by FORTRAN program.Further more,a biaxial shearing test showing the development of shear band is then simulated to show the model ability on simulating a multi-element model,the mesh dependency and loading velocity effect are also analyzed.Finally,a case of cut slope is simulated to examine the application of the implemented model of structured clay in FLAC in geotechnical engineering.%FLAC软件广泛应用于岩石及岩土工程数值分析中,但内置材料模型库的不足影响了其应用范围及分析结果的精细化.本文基于FLAC程序提供的二次开发平台,以结构性黏土边界面模型为例,在FISH编译环境下实现了复杂本构模型的开发与应用.首先,介绍了FLAC的关键开发技术和具体实施方法;其次,给出了结构性黏土边界面模型的基本原理及应力积分方法;然后,通过FLAC单元测试与FORTRAN程序计算结果的对比,验证了FLAC二次开发在多种应力路径下的正确性;随后,通过FLAC排水平面应变剪切试验模拟剪切带的形成,测试了二次开发模型的多单元模拟能力,同时验证了其网格依赖性问题;最后,通过对土坡开挖的模拟,测试了结构性黏土模型FLAC二次开发的工程适用性.