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液压作用下混凝土裂缝扩展的阻力分析

Resistance Analysis of Crack Propagation in Concrete Subjected to Hydraulic Pressure.

作者信息

Wang Yang, Sun Jingshan, Wang Gaohui, Li Yongzhen, Xiong Weiqi

机构信息

State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, China.

Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, China.

出版信息

Materials (Basel). 2024 Jul 2;17(13):3243. doi: 10.3390/ma17133243.

DOI:10.3390/ma17133243
PMID:38998325
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11242704/
Abstract

The resistance curve for hydraulic crack propagation in a concrete beam was determined and discussed. A semi-analytical method was introduced to calculate the hydraulic crack propagation in concrete. A series of concrete beams with various hydraulic pressures and initial crack depths were tested, and the hydraulic crack propagation in these beams was calculated. The calculated curves were first verified, and then the calculated resistance curve for hydraulic crack propagation was determined. Based on the test results and calculation results, the following conclusions can be drawn: The proposed analysis method can accurately predict the hydraulic crack propagation process in concrete. The resistance to hydraulic crack propagation in concrete decreases with the increase in hydraulic pressure but is less influenced by the initial crack depth of the test beams. In addition, the concrete beams collapse immediately under hydraulic fracturing once the curve reaches the resistance curve. This indicates that the failure of concrete structures under hydraulic fracturing occurs immediately once the driving force of crack propagation, dominated by the hydraulic pressure in the crack, becomes significant.

摘要

测定并讨论了混凝土梁中水力裂缝扩展的阻力曲线。引入了一种半解析方法来计算混凝土中的水力裂缝扩展。对一系列具有不同水压和初始裂缝深度的混凝土梁进行了试验，并计算了这些梁中的水力裂缝扩展。首先对计算曲线进行了验证，然后确定了计算得到的水力裂缝扩展阻力曲线。基于试验结果和计算结果，可得出以下结论：所提出的分析方法能够准确预测混凝土中的水力裂缝扩展过程。混凝土中水力裂缝扩展的阻力随水压的增加而减小，但受试验梁初始裂缝深度的影响较小。此外，一旦曲线达到阻力曲线，混凝土梁在水力压裂作用下会立即坍塌。这表明，一旦由裂缝中的水压主导的裂缝扩展驱动力变得显著，混凝土结构在水力压裂作用下就会立即发生破坏。

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