为研究渗透影响下的全风化泥质粉砂岩的本构关系,依托南昌地铁隧道下卧全风化泥质粉砂岩,根据三轴不排水剪切试验,揭示其在静载下的力学响应机制。同时在试验结果的数据支持下,结合已有弹塑性本构模型,引入初始裂隙损伤变量和渗透次损伤变量,构建了相适用的本构模型,对其通过程序进行二次开发,最后对比验证了自研全风化泥质粉砂岩弹塑性损伤模型的正确性。结果表明:(1)通过考虑初始损伤与渗透次损伤共同作用下的耦合损伤变量关系,建立了适用于该岩样的本构关系;(2)推导出相应的本构积分算法,通过UMAT接口程序完成了本构模型的二次开发;(3)基于二次开发后的本构模型,借助有限元软件对考虑损伤的全风化泥质粉砂岩进行数值模拟,并通过数值验证发现,模型能够较好地描述不同围压、不同应力水平下应力﹣应变关系,在一定程度上还能反映其应变累积性。
In order to study the constitutive relationship of fully weathered argillaceous siltstone under the influence of seepage, based on the fully weathered argillaceous siltstone under the Nanchang subway tunnel, according to the triaxial undrained shear test, the mechanical response mechanism under static load is revealed. At the same time, with the support of the data of the test results, combined with the existing elastic-plastic constitutive model, the initial crack damage variable and the seepage sub-damage variable are introduced to construct the applicable constitutive model, and the secondary development is carried out through the program. Finally, the correctness of the self-developed elastic-plastic damage model of fully weathered argillaceous siltstone is verified by comparison. The findings indicate: (1) By considering the coupling damage variable relationship under the combined action of initial damage and seepage secondary damage, the constitutive relationship suitable for the rock sample is established. (2) The corresponding constitutive integration algorithm is deduced, and the secondary development of the constitutive model is completed through the UMAT interface program. (3) Based on the secondary developed constitutive model, the fully weathered argillaceous siltstone considering damage is numerically simulated by finite element software. Through numerical verification, it is found that the model can better describe the stress-strain relationship under different confining pressures and different stress levels, and to a certain extent, it can also reflect its strain accumulation.
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