Influence of substrate properties on fracture behavior of rock-concrete bi-material central interface cracked Brazilian disks at different loading angles

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-11-13 DOI:10.1016/j.tafmec.2024.104757

Mao Zhou , Wenyu Zhang , Yaozhong Xu , Fengfei He , Yunru Wang , Shiming Dong

{"title":"Influence of substrate properties on fracture behavior of rock-concrete bi-material central interface cracked Brazilian disks at different loading angles","authors":"Mao Zhou , Wenyu Zhang , Yaozhong Xu , Fengfei He , Yunru Wang , Shiming Dong","doi":"10.1016/j.tafmec.2024.104757","DOIUrl":null,"url":null,"abstract":"<div><div>Rock-concrete (R-C) bi-material structures are crucial for safety in tunnel construction and similar projects. The load-bearing properties and fracture patterns of structures made of concrete combined with rocks of varying properties exhibit notable differences. This study conducts experiments and numerical simulations on R-C central interface crack Brazilian disk specimens, investigating the effects of rock type, interface crack length, effective modulus ratio, and tensile strength ratio on fracture behavior under different loading angles. Quasi-static compression tests were carried out on sandstone-concrete (S-C) and granite-concrete (G-C) specimens at varying angles, revealing significant differences in fracture patterns and load-bearing capacity. The fracture patterns of S-C show interface extension cracks, tensile wing cracks, and vertical tensile cracks, while, G-C specimens exhibit additional single-wing crack patterns; Peak loads increase with loading angle, with G-C specimens initially having lower peak loads than S-C specimens at angles from 0° to 15°, but surpassing them at higher angles. Then, discrete element models of R-C were constructed using PFC2D and validated with experiments. The influence of interface crack length on the fracture patterns of S-C and G-C specimens was initially investigated using numerical methods. Subsequently, fracture propagation simulations for R-C samples with varying effective modulus and tensile strength ratios were performed. The simulation results show that smaller interface cracks lead to more secondary cracks in concrete, resulting in a heightened degree of fragmentation. Increasing effective modulus and tensile strength ratios result in various crack patterns: interface propagation crack, wing crack in rock and concrete, wing crack only in rock or concrete, vertical tensile crack in rock and concrete, and vertical crack only in rock or concrete; The peak load shows an increasing and then decreasing trend with increasing effective modulus ratio, while with the increase of tensile strength ratio exhibits an increasing and then steadily changing pattern.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"134 ","pages":"Article 104757"},"PeriodicalIF":5.0000,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Theoretical and Applied Fracture Mechanics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S016784422400507X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Rock-concrete (R-C) bi-material structures are crucial for safety in tunnel construction and similar projects. The load-bearing properties and fracture patterns of structures made of concrete combined with rocks of varying properties exhibit notable differences. This study conducts experiments and numerical simulations on R-C central interface crack Brazilian disk specimens, investigating the effects of rock type, interface crack length, effective modulus ratio, and tensile strength ratio on fracture behavior under different loading angles. Quasi-static compression tests were carried out on sandstone-concrete (S-C) and granite-concrete (G-C) specimens at varying angles, revealing significant differences in fracture patterns and load-bearing capacity. The fracture patterns of S-C show interface extension cracks, tensile wing cracks, and vertical tensile cracks, while, G-C specimens exhibit additional single-wing crack patterns; Peak loads increase with loading angle, with G-C specimens initially having lower peak loads than S-C specimens at angles from 0° to 15°, but surpassing them at higher angles. Then, discrete element models of R-C were constructed using PFC2D and validated with experiments. The influence of interface crack length on the fracture patterns of S-C and G-C specimens was initially investigated using numerical methods. Subsequently, fracture propagation simulations for R-C samples with varying effective modulus and tensile strength ratios were performed. The simulation results show that smaller interface cracks lead to more secondary cracks in concrete, resulting in a heightened degree of fragmentation. Increasing effective modulus and tensile strength ratios result in various crack patterns: interface propagation crack, wing crack in rock and concrete, wing crack only in rock or concrete, vertical tensile crack in rock and concrete, and vertical crack only in rock or concrete; The peak load shows an increasing and then decreasing trend with increasing effective modulus ratio, while with the increase of tensile strength ratio exhibits an increasing and then steadily changing pattern.

查看原文本刊更多论文

基体特性对不同加载角度下岩石-混凝土双材料中心界面开裂巴西盘断裂行为的影响

岩石-混凝土（R-C）双材料结构对隧道施工和类似工程的安全至关重要。由混凝土与不同性质的岩石组合而成的结构，其承载性能和断裂模式存在明显差异。本研究对 R-C 中央界面裂缝巴西盘试件进行了实验和数值模拟，研究了岩石类型、界面裂缝长度、有效模量比和抗拉强度比对不同加载角度下断裂行为的影响。对砂岩-混凝土（S-C）和花岗岩-混凝土（G-C）试样进行了不同角度的准静态压缩试验，结果表明断裂形态和承载能力存在显著差异。S-C 试样的断裂形态表现为界面延伸裂缝、拉伸翼裂缝和垂直拉伸裂缝，而 G-C 试样则表现为额外的单翼裂缝形态；峰值荷载随加载角度的增加而增加，在 0° 至 15° 的角度下，G-C 试样的峰值荷载最初低于 S-C 试样，但在较高角度下超过了 S-C 试样。然后，使用 PFC2D 建立了 R-C 离散元素模型，并与实验进行了验证。首先使用数值方法研究了界面裂纹长度对 S-C 和 G-C 试样断裂模式的影响。随后，对不同有效模量和拉伸强度比的 R-C 试样进行了断裂扩展模拟。模拟结果表明，较小的界面裂缝会在混凝土中产生更多的次生裂缝，从而导致碎裂程度加剧。有效模量比和抗拉强度比的增加会导致不同的裂缝模式：界面扩展裂缝、岩石和混凝土中的翼状裂缝、仅岩石或混凝土中的翼状裂缝、岩石和混凝土中的垂直拉伸裂缝以及仅岩石或混凝土中的垂直裂缝；随着有效模量比的增加，峰值荷载呈现先增加后减少的趋势，而随着抗拉强度比的增加，峰值荷载呈现先增加后稳定变化的模式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.