天然中等风化泥岩非线性黏弹塑性蠕变模型

天然中等风化泥岩作为灌注桩的桩基承台,其承受混凝土灌注桩传递的长期荷载会发生蠕变,而中等风化泥岩的蠕变过大会对灌注桩承载力有影响,因此需要展开中等风化泥岩蠕变模型的探讨和研究。由于目前大多数蠕变模型对于蠕变的全阶段曲线的描述都不太理想,所以基于西原体,把非线性黏塑性体与西原体串联得到了一种新的模型;继而通过拉式变换得到了一种新的蠕变方程。以新的蠕变方程对中等风化泥岩单轴蠕变的试验数据进行拟合,并对此蠕变方程进行了与时间有关的参数敏感性分析。

Nonlinear Viscoelastic-plastic Rheological Model Of Natural Moderately Weathered Mudstone

The creep property of medium weathered mudstone, as the cap of concrete cast-in-place pile, has a certain influence on the bearing capacity of concrete cast-in-place pile under long-term load, so the study of creep property of natural medium-weathered mudstone has certain engineering significance. Because the constitutive equations of most rocks are not ideal for describing the accelerated creep stage at present, a new model is obtained in this paper, which is based on the Westen model and the nonlinear viscoplastic body in series with the Xiyuan model. Then a new creep equation is obtained by pull transformation. The uniaxial creep test of moderately weathered mudstone is fitted with a new creep equation, and the time sensitivity of the equation is analyzed.