砂土与结构物界面的应力–位移–微结构特性及本构模型

doi:10.13722/j.cnki.jrme.2023.0791

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摘要砂土与结构物界面受剪时微结构会发生演变，并产生状态依赖的应力位移行为。采用界面直剪仪对不同常法向刚度和常法向应力条件下的砂土–钢板界面进行单调和循环剪切试验，并通过高清图像识别技术分析剪切过程中的界面微结构的演变，发现：常法向刚度和常法向应力条件下单调剪切时界面均发生不同程度的剪胀，常法向应力条件下的剪切会使试样产生更明显的软化行为和较多的微结构变化，即颗粒概率熵会随着剪切位移的增大而逐渐增加；循环加载时，处于临界状态线下方的界面土会交替出现剪缩和剪胀现象，伴随着界面的微结构发生波动演变，界面总体会表现出较强的剪缩；先期循环剪切会使得界面发生强度弱化；可见微结构演化影响着界面土的剪胀。为描述此类现象，提出基于微结构演化的动态剪胀状态线，据此建立砂土–结构物界面的非关联随动硬化弹塑性本构模型。模型有12个参数，均可通过试验获得。通过模拟试验数据发现，模型可以合理描述界面的剪胀和软化等力学行为，特别是循环荷载作用下界面的强剪缩行为。

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	叶至韬
	高玉峰
	黄星博
	孙逸飞

关键词 ：土力学, 界面, 微结构, 剪胀, 状态参数, 本构模型

Abstract：The microstructure of sand-structure interface would evolve due to resulting in the state dependence of its stress-displacement behavior. A series of monotonic and cyclic interface direct shear tests on the sand-steel interface under constant normal stiffness(CNS) and constant normal load(CNL) conditions were carried out，where the evolution of the microstructure within the interface was analyzed using high-resolution image identification technique. It was found that different extents of interface dilatancy occurred under monotonic tests with CNS and CNL. Higher extent of dilatancy and microstructure evolution took place under CNL，where the particle probabilistic entropy increased with the shear displacement. When subjected to cyclic shearing，the interface with initial state under the critical state line exhibited contraction and dilatancy alternately. As the load cycles increased，the microstructure within the interface evolved，with an alternately increase or decrease in the particle probabilistic entropy，which resulted in an overall contraction of the interface. Thus，microstructure evolution influences the interface dilatancy. To capture these phenomena，a microstructure-dependent dilatancy state line was proposed，based on which a nonassociated kinematic hardening elastoplastic model for sand-structure interface was developed. The model had 12 parameters，which can be all determined from laboratory test. Simulations of the test data revealed that the model can reasonably capture the dilatancy and softening behaviors，etc.，of the interface，especially the strong contraction behavior under cyclic loads.

Key words： soil mechanics interface microstructure dilatancy state parameter constitutive model

引用本文:

叶至韬，高玉峰，黄星博，孙逸飞. 砂土与结构物界面的应力–位移–微结构特性及本构模型[J]. 岩石力学与工程学报, 2024, 43(6): 1549-1560.
YE Zhitao，GAO Yufeng，HUANG Xingbo，SUN Yifei. Stress-displacement-microstructure characteristics and constitutive modelling of sand-structure interfaces. , 2024, 43(6): 1549-1560.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0791 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I6/1549

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