Crack propagation process and lifetime prediction method of concrete-rock interface under constant loading

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL International Journal of Rock Mechanics and Mining Sciences Pub Date : 2024-07-30 DOI:10.1016/j.ijrmms.2024.105839
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Abstract

This study investigated the crack propagation processes and established the lifetime prediction methods of the concrete-rock interfaces under constant loading. Firstly, the constant loading tests were performed under three-point bending loading on the composite concrete-rock beams with three kinds of interfaces, i.e. natural, 4 × 4, and 7 × 7 interfaces, and under three constant load levels, i.e. initial cracking load, 80 % and 97 % of the peak loads. Then, the clip gauge method and digital image correlation method were employed to detect the crack lengths under constant loading. Finally, the effects of constant load levels on fracture properties of the concrete-rock interfaces were analyzed and the crack propagation processes under constant loading were discussed. The results indicated that the clip gauge method was an available and accurate method to detect the crack lengths of the concrete-rock interfaces under constant loading. Crack propagation processes and crack mouth opening processes under constant loading exhibited the three-stage feature, i.e. deceleration stage, uniform stage and acceleration stage. In addition, the logarithms of the constant loading lifetimes showed an approximate linear relationship with the logarithms of the crack mouth uniform opening rates, and a quantitative relationship was established by using the linear regression analysis to establish the lifetime prediction methods. This study proposed a practical method to predict the service life of concrete structure-bedrock interface. When the crack mouth uniform opening stage was recognized, the lifetime of concrete structure-bedrock interface in service can be predicted by substituting the crack mouth uniform opening rate into the pre-established prediction model. This study can provide the theoretical support for the safety assessment of the concrete structure-bedrock interface in service.

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恒定荷载下混凝土-岩石界面的裂缝扩展过程和寿命预测方法
本研究探讨了混凝土-岩石界面在恒定荷载作用下的裂纹扩展过程,并建立了寿命预测方法。首先,在三种界面(即自然界面、4 × 4 界面和 7 × 7 界面)的混凝土-岩石复合梁上,在三种恒定荷载水平(即初始开裂荷载、峰值荷载的 80 % 和 97 %)下进行了三点弯曲恒载试验。然后,采用夹钳法和数字图像相关法检测恒定荷载下的裂缝长度。最后,分析了恒定荷载水平对混凝土-岩石界面断裂特性的影响,并讨论了恒定荷载下的裂缝扩展过程。结果表明,夹规法是检测恒定荷载下混凝土-岩石界面裂缝长度的一种可用且准确的方法。恒定荷载下的裂缝扩展过程和裂缝张口过程呈现三阶段特征,即减速阶段、均匀阶段和加速阶段。此外,恒定加载寿命的对数与裂口均匀张开率的对数呈近似线性关系,并通过线性回归分析建立了定量关系,从而确立了寿命预测方法。本研究提出了一种实用的混凝土结构-岩石界面使用寿命预测方法。当裂缝口均匀张开阶段得到确认后,将裂缝口均匀张开率代入预先建立的预测模型,即可预测混凝土结构-岩土界面的服役寿命。该研究可为混凝土结构-基岩界面的使用安全评估提供理论支持。
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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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