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在广义虎克定律的基础上,除考虑传统岩土材料弹性模量E外,新引入两个无量纲物理力学参数R、η,对其本构模型进行修正。分析了基桩-岩土体相互作用的3种力学特性曲线,修正本构模型能够反映这3种力学行为曲线的相关特征。为验证修正本构模型的适用性,以沪昆高速铁路软土地区灌注桩为工程实例,对基桩进行了静载荷试验。试验结果显示:实测的应力-位移点值基本紧贴修正本构模型的理论计算曲线,表明实测数据与该修正本构模型吻合程度较好,验证了该本构模型能够描述各类岩土体材料与基桩之间的力学特性,从而为研究基桩-岩土体之间的力学特性提供一种新的思路。
Based on the generalized Hooke’s law, in addition to considering the elastic modulus E of traditional geomaterials, two dimensionless physical and mechanical parameters R and η are newly introduced to modify their constitutive models. Three kinds of mechanical characteristic curves of pile-rock interaction are analyzed. Correcting the constitutive model can reflect the relevant characteristics of the three kinds of mechanical behavior curves. In order to verify the applicability of the modified constitutive model, a static load test was carried out on piles under soft soil in Shanghai-Kunming high-speed railway as an example. The experimental results show that the measured stress-displacement points are basically close to the theoretical calculation curves of the modified constitutive model, which shows that the observed data are in good agreement with the revised constitutive model. It is verified that the constitutive model can describe all types of rock and soil The mechanical properties between the material and the pile, so as to provide a new way of thinking for studying the mechanical characteristics between the pile and the pile-soil.