Experimental Investigation on Mechanical Behavior of Sandstone Containing Two Non-Coplanar Fissures Under Triaxial Monotonic and Multilevel Cyclic Loading

IF 3.2 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2026-10-04 Epub Date: 2026-08-18 DOI:10.1111/ffe.70392

Wang-Xing Hong, Sheng-Qi Yang, De-An Zheng

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引用次数: 0

Abstract

Natural rock masses with complex fissures are frequently subjected to multilevel cyclic loading during underground engineering construction. The effect of fissure layout patterns and confining pressure on the fatigue mechanical behavior of fissured rocks remains poorly understood. Therefore, triaxial multilevel cyclic loading tests were performed on sandstone specimens containing two non-coplanar fissures with four layout patterns. The results indicated that: (1) Fissure layout patterns dominated the characteristics of stress–strain curves and the degree of mechanical deterioration of specimens. (2) Multilevel cyclic loading altered the inherent stress fluctuation features on the stress–strain curves of fissured specimens. (3) Multilevel cyclic loading generally reduced peak strength compared with monotonic loading, while gentle–gentle type specimens exhibited strength enhancement. (4) Multilevel cyclic loading and confining pressure both promoted the transition from tensile-dominated crack coalescence to shear-dominated crack coalescence. These findings could provide a reference for the stability assessment of flawed rock masses under cyclic engineering disturbance.

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含两个非共面裂隙砂岩在三轴单调和多级循环加载下力学行为的试验研究

具有复杂裂隙的天然岩体在地下工程施工中经常受到多级循环加载。裂隙布置模式和围压对裂隙岩石疲劳力学行为的影响尚不清楚。为此，对含2条非共面裂缝、4种布置模式的砂岩试件进行了三轴多级循环加载试验。结果表明：(1)裂纹分布模式主导了试样的应力-应变曲线特征和力学劣化程度。(2)多级循环加载改变了裂隙试件应力-应变曲线的固有应力波动特征。(3)与单调加载相比，多级循环加载总体上降低了试件的峰值强度，而温和-温和型试件的峰值强度有所提高。(4)多级循环加载和围压均促进了由拉裂为主的裂缝聚结向剪切为主的裂缝聚结的转变。研究结果可为有缺陷岩体在循环工程扰动下的稳定性评价提供参考。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.