红砂岩复合缺陷破坏特征及力学机理研究

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Bingquan Chen, Zhiguo Xia, Yadong Xu, Shuai Liu, Xingzong Liu
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引用次数: 4

摘要

采用二维颗粒流码数值软件对不同裂纹角度的红砂岩进行单轴压缩试验,研究含复合缺陷红砂岩的强度和破坏机理,并对其力学参数和破坏过程进行研究和分析。结果表明:预制组合缺陷试样的峰值强度、峰值应变、弹性模量等力学特性明显低于完整缺陷试样;随着裂纹角度从15°增加到60°,裂纹的弱化面积增大,弹性模量、峰值强度和峰值应变逐渐减小,裂纹总数增加,释放的应变能更多。此外,试样经历了初始脆性破坏到塑性破坏阶段,破坏形式更为显著,导致剥落现象。而随着裂纹角从75°增加到90°,裂纹-孔组合在裂纹-裂纹组合的尖端共同分担应力集中,导致弹性模量、峰值应变和峰值强度逐渐增大,但总裂纹数减少,应变能释放减少,塑性破坏状态减弱,剥落现象减缓。在此基础上,选取30°和45°开裂-裂纹组合的试样进行进一步的试验研究。通过对试验结果和模拟结果的对比分析,发现试样的破坏强度和最终破坏模式随裂纹扩展较为相似。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Failure characteristics and mechanical mechanism of study on red sandstone with combined defects
In this study, the strength and failure mechanism of red sandstones with combined defects were investigated by uniaxial compression tests on red sandstones with different crack angles using two-dimensional particle flow code numerical software, and their mechanical parameters and failure process were studied and analyzed. The results showed that the mechanical characteristics such as peak strength, peak strain, and elastic modulus of the samples with prefabricated combined defects were significantly inferior than those of the intact samples. With increasing crack angle from 15° to 60°, the weakening area of cracks increased, elastic modulus, peak strength, and peak strain gradually reduced, the total number of cracks increased, and more strain energy was released. In addition, the samples underwent initial brittle failure to plastic failure stage, and the failure form was more significant, leading to peeling phenomenon. However, with increasing crack angle from 75° to 90°, the crack–hole combination shared the stress concentration at the tip of the crack–crack combination, resulted in a gradual increase in elastic modulus, peak strain and peak strength, but a decrease in the number of total cracks, the release of strain energy reduced, the plastic failure state weakened, and the spalling phenomenon slowed down. On this basis, the samples with 30° and 45°crack-crack combination were selected for further experimental investigation. Through comparative analysis between the experimental and simulation results, the failure strength and final failure mode with cracks propagation of samples were found to be relatively similar.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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