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A cohesive damage-friction interface model accounting for water pressure on crack propagation

机译：考虑裂纹扩展水压的内聚损伤-摩擦界面模型

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摘要

Aim of the work is the study of crack propagation in concrete constructions, such as dams, taking into account the water pressure effects and the damage-friction evolution with unilateral contact. With this aim, an interface model, based on the cohesive fracture, is developed. In particular, a damage-friction model based on a new multiscale approach is proposed for the interface, which is able to simulate crack propagation in mode Ⅰ, mode Ⅱ, and mixed mode. The criteria for crack initiation and propagation and the closure and reopening of the crack are considered for the interface. The friction and the dilatancy are characterized by a decreasing rate of friction and dilatancy angles, respectively, with the possibility of the dilatancy recovering during cyclic loading. The water pressure effect is taken into account by considering a further static pressure acting on the real crack and in the process zone. The value of this pressure is set as a function of the crack opening displacement and it varies from a prescribed initial pressure to the external water pressure. A numerical procedure is developed in order to integrate the evolutive laws governing the interface model. The interface model is implemented in finite element codes; some numerical simulations and a comparison with experimental data are performed in order to validate the proposed model and to investigate the influence of the water pressure effects on the crack propagation. Finally, the mechanical response of a concrete dam is studied.
机译：这项工作的目的是研究混凝土结构（例如大坝）中的裂纹扩展，同时考虑水压效应和单侧接触的损伤-摩擦演化。为此，开发了基于内聚断裂的界面模型。特别地，针对该界面提出了一种基于新的多尺度方法的损伤-摩擦模型，该模型能够模拟模式Ⅰ，模式Ⅱ和混合模式下的裂纹扩展。界面考虑了裂纹萌生和扩展以及裂纹闭合和重新开放的标准。摩擦和剪胀分别以减小的摩擦速率和剪胀角为特征，并且在循环载荷期间有可能恢复剪胀。通过考虑作用在实际裂纹上和加工区中的其他静压力来考虑水压效应。该压力的值被设定为裂缝开度的函数，并且其从规定的初始压力到外部水压变化。为了整合控制接口模型的发展规律，开发了一种数值程序。接口模型以有限元代码实现；进行了一些数值模拟，并与实验数据进行了比较，以验证所提出的模型并研究水压效应对裂纹扩展的影响。最后，研究了混凝土坝的力学响应。

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