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在冻融条件下评估具有非连续节理几何形状的类岩石材料的抗剪强度和声发射。

Evaluating shear strength and acoustic emission in rock-like materials with non-persistent joint geometries under freeze-thaw conditions.

作者信息

Kefayati Sadegh, Eftekhari Mosleh, Goshtasbi Kamran, Ahmadi Morteza

机构信息

Department of Mining Engineering, Faculty of Engineering, Tarbiat Modares University, Jalal AleAhmad, Nasr Street, Tehran, 14115-14, Iran.

出版信息

Sci Rep. 2025 Jul 1;15(1):20488. doi: 10.1038/s41598-025-07943-1.

DOI:10.1038/s41598-025-07943-1
PMID:40593077
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12214711/
Abstract

This study examines the effects of freeze-thaw cycles and the geometric configuration of non-persistent joints on the shear behavior of rock masses. Various artificial rock samples with non-persistent joints underwent direct shear testing to investigate how freeze-thaw cycles (F-T), the rock bridge angle (β), the number of joints (N), and normal stress (σ) influence shear strength and fracture development. Taguchi's method was employed for experimental design, and the impact of the parameters was evaluated using analysis of variance (ANOVA). Additionally, acoustic emission (AE) detection was utilized to reveal the fracturing characteristics of rock bridges during the tests. The results indicate that normal stress has the most significant effect on shear strength, while the number of joints has the least impact. The angle of the rock bridge is the second most crucial factor influencing shear strength; specifically, low angles lead to tensile failure, while higher angles result in a transition to shear failure. AE data shows that tensile failure occurs at high average frequencies (AF) and low rise angle (RA) values, whereas shear failure exhibits the opposite characteristics. F-T cycles rank third in significance. The results indicate that frost heave primarily affects the specimens in the initial stages of the F-T cycles. Furthermore, the direct shear test results for specimens subjected to F-T cycles are categorized into three stages based on acoustic emission (AE) data: a quiet stage, an AE development stage, and a drop AE stage. Notably, as the number of F-T cycles increases, both the duration of the AE development stage and the AE energy level decrease.

摘要

本研究考察了冻融循环以及非贯通节理的几何形态对岩体抗剪性能的影响。对含有非贯通节理的各种人工岩石样本进行了直剪试验，以研究冻融循环（F-T）、岩桥角度（β）、节理数量（N）和法向应力（σ）如何影响抗剪强度和裂隙发育。采用田口方法进行试验设计，并使用方差分析（ANOVA）评估参数的影响。此外，利用声发射（AE）检测来揭示试验过程中岩桥的破裂特征。结果表明，法向应力对抗剪强度的影响最为显著，而节理数量的影响最小。岩桥角度是影响抗剪强度的第二关键因素；具体而言，小角度会导致拉伸破坏，而较大角度则会导致破坏模式转变为剪切破坏。AE数据表明，拉伸破坏发生在高平均频率（AF）和低上升角（RA）值时，而剪切破坏则表现出相反的特征。冻融循环的影响程度排名第三。结果表明，冻胀主要在冻融循环的初始阶段对试样产生影响。此外，根据声发射（AE）数据，将经历冻融循环的试样的直剪试验结果分为三个阶段：安静阶段、AE发展阶段和AE下降阶段。值得注意的是，随着冻融循环次数的增加，AE发展阶段的持续时间和AE能量水平均会降低。

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