Analytical solution for concrete/rock interface shearing under CNS considering interlocking effect and wear behavior and its application

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-22 DOI:10.1007/s10064-024-03994-2

Chaoyang Zhang, Chong Jiang, Li Pang, Yaolong Ma

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Abstract

Using a two-order profile to characterize the concrete/rock interface, this paper proposes an analytical solution for the shear behavior of the concrete/rock interface under constant normal stiffness (CNS), taking into account the interlocking effect and wear behavior. The interlocking effect of second-order asperities is reflected by considering the work and energy, and the analytical expression of wear behavior is obtained by geometrically decomposing the worn rock asperity into finite tiny triangles. Subsequently, the proposed analytical model, consisting of the elastic stage, the sliding stage, and the progressive damage stage, is substituted into the load-transfer governing equation, and the bearing characteristics of rock-socketed piles are figured out by taking advantage of the finite-difference method. Finally, a parametric analysis is conducted to investigate the effects of second-order asperity distribution parameter \(\eta\), wear coefficient \(\xi\), and first-order asperity angle \({\alpha }_{0}\). Both laboratory CNS direct shear tests and field vertical load pile tests are selected to verify the reliability of the proposed analytical model. The results indicate that the proposed analytical model can effectively reflect the variation characteristics of the shear stress-displacement curve and the normal stress-displacement curve under CNS conditions, and its application in the load-transfer behavior of rock-socketed piles can well predict the bearing characteristics.

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考虑互锁效应和磨损行为的 CNS 条件下混凝土/岩石界面剪切的分析解决方案及其应用

本文使用二阶剖面表征混凝土/岩石界面，提出了恒定法向刚度（CNS）下混凝土/岩石界面剪切行为的分析方法，同时考虑了互锁效应和磨损行为。通过考虑功和能量来反映二阶表面的互锁效应，并通过将磨损的岩石表面几何分解为有限微小三角形来获得磨损行为的分析表达式。随后，将所提出的由弹性阶段、滑动阶段和渐进损伤阶段组成的分析模型代入荷载传递控制方程，并利用有限差分法计算嵌岩桩的承载特性。最后，进行了参数分析，研究了二阶抗震分布参数\(\eta\)、磨损系数\(\xi\)和一阶抗震角\({\alpha }_{0}\)的影响。为了验证所建分析模型的可靠性，选择了实验室 CNS 直接剪切试验和现场垂直荷载桩试验。结果表明，所提出的分析模型能有效反映 CNS 条件下剪应力-位移曲线和法向应力-位移曲线的变化特征，将其应用于嵌岩桩的荷载传递行为中能很好地预测其承载特性。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.