循环冻融处理对砂岩模式 I 和模式 II 断裂特征的影响

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-10-17 DOI:10.1016/j.conbuildmat.2024.138747

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引用次数: 0

摘要

随着越来越多的寒冷地区工程如路基边坡、矿山边坡和大坝等面临断裂破坏的风险，岩石在冻融循环下的断裂特征和机理亟待进一步阐明。本文旨在通过冻融循环试验、核磁共振试验和不同断裂模式下样品的静态劈裂试验，揭示冻融处理砂岩的孔隙结构演变、断裂特征及其相关性。分析了冻融循环对样品孔隙率、峰值应力、断裂韧性、断裂能和破坏模式的影响。结果表明，随着冻融循环次数的增加，中孔、大孔和所有孔隙的光谱面积呈增长趋势，在 100 次冻融循环时，其增长率分别达到 47.74 %、338.51 % 和 63.25 %。两种断裂模式的峰值应力、断裂韧性和断裂能的变化趋势相似，随着冻融风化引起的孔隙结构加速发展和损伤积累，它们随着 F-T 周期的增加呈对数下降趋势，在 100 F-T 周期时，它们的下降率从 68.95 % 到 84.32 % 不等。由于孔隙结构的发展，模式 I 断裂失效试样的力学参数小于模式 II 断裂失效试样的力学参数。此外，断裂韧性、峰值应力与大孔隙的光谱面积呈很强的线性关系，断裂韧性与断裂能呈很强的二次方关系。两种断裂模式的破坏形式随 F-T 风化而变化。

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Effect of cyclic freeze-thaw treatment on mode I and mode II fracture characteristics of sandstone

As more and more cold region engineering projects like roadside slopes, mining slopes, and dams are at risk of fracture failure, the fracture characteristics and mechanisms of rocks under freeze-thaw cycles need to be further clarified. This paper aims to reveal the evolution of pore structure, fracture characteristics, and their correlation in freeze-thaw treated sandstone through freeze-thaw cycle tests, nuclear magnetic resonance tests, and static splitting tests of samples under different fracture modes. The effects of freeze-thaw cycles on sample porosity, peak stress, fracture toughness, fracture energy, and failure modes were analyzed. Results show that spectrum areas of meso pores, macro pores and all pores show growth trend with F-T cycles, their growth rate reach 47.74 %, 338.51 % and 63.25 % at 100F-T cycles. Both of peak stress, fracture toughness and fracture energy for two fracture modes have similar variation trend, they exhibit a logarithmic decline with the increase of F-T cycles as accelerated pore structure development and damage accumulation induced by freeze-thaw weathering, their decline rate ranges from 68.95 % to 84.32 % at 100 F-T cycles. The mechanical parameters of specimens failure with mode I fracture are smaller than that failure with mode II fracture due to the development of the pore structure. In addition, fracture toughness, peak stress show strong linear correlation with the spectral area of large pores, and fracture toughness and fracture energy shows a strong quadratic relationship. The failure forms of two fractures mode changed with F-T weathering.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.