楔形劈裂试验对混凝土水力断裂行为的试验研究

IF 1.9 4区材料科学 Q3 Materials Science

Science and Engineering of Composite Materials Pub Date : 2023-01-01 DOI:10.1515/secm-2022-0182

Wenhu Zhao, T. Fang, Xiaocui Chen, Liguo Sun

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引用次数: 0

摘要

本文的目的是通过动态荷载下的楔形劈裂试验，研究水压对混凝土水力断裂行为的影响。在实验过程中，沿裂缝路径粘贴了五个防水应变片，以观察断裂过程。四个硅水压传感器成功地测量了混凝土表面的水压值。结果表明，裂缝面上的水压加速了混凝土的裂缝扩展。当外加水压为0.2和0.4时，劈裂力的临界值分别降低了26.7%和25.6% MPa。此外，水力裂纹扩展速度在开始时增加，并趋于最终达到峰值。裂解速度峰值为11.08 m/s，这是高的。在动态荷载作用下，水不能填充裂缝，只有截留的水与裂缝表面相互作用。水压主要沿裂缝路径呈抛物线分布，峰值随裂缝长度的增加而减小。

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Experimental study on hydraulic fracture behavior of concrete with wedge-splitting testing

Abstract The aim of this paper is to investigate the water pressure effects on hydraulic fracture behavior of concrete with wedge-splitting testing under dynamic loading. Five waterproof strain gauges are stuck along the crack path to observe the fracture process during the experiments. Four silicon water pressure sensors successfully measured the water pressure value on concrete face. The results show that the water pressure on crack faces accelerates the crack propagation of the concrete. The critical values of the splitting force decrease 26.7 and 25.6%, respectively, with the external applied water pressure of 0.2 and 0.4 MPa. Moreover, the hydraulic crack propagation speed increases at the beginning and tends to reach a peak value finally. The peak value of cracking speed is 11.08 m/s, which is high. Under dynamic loading, the water fails to fill the crack and only the trapped water interacts with the crack face. The water pressure is mainly a parabolic curve distribution along the crack path and the peak value decreases with the increase in the crack length.

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来源期刊

Science and Engineering of Composite Materials 工程技术-材料科学：复合

CiteScore

3.10

自引率

5.30%

发文量

审稿时长

4 months

期刊介绍： Science and Engineering of Composite Materials is a quarterly publication which provides a forum for discussion of all aspects related to the structure and performance under simulated and actual service conditions of composites. The publication covers a variety of subjects, such as macro and micro and nano structure of materials, their mechanics and nanomechanics, the interphase, physical and chemical aging, fatigue, environmental interactions, and process modeling. The interdisciplinary character of the subject as well as the possible development and use of composites for novel and specific applications receives special attention.