Effect of Rock Lithology and Reloading Direction on Rock Stress Memory

IF 0.8 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Journal of Testing and Evaluation Pub Date : 2024-07-01 DOI:10.1520/jte20230714

Chun-de Ma, Jun-jie Zhang, Guan-shuang Tan, Wen-yuan Yang, Ze-lin Liu

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引用次数: 0

Abstract

The Kaiser effect (KE), as a presentation of rock stress memory, has been widely used in in situ stress measurement because of its convenience and economy. However, the influence of rock lithology and directionality on the KE have not been answered yet. To solve this question, three-stage loading Brazilian tests were conducted on three types of rock disks in this study. The specimens were rotated with a certain rotation angle θ (5°–90°) before the third-stage loading, and the jump point method and bilinear regression method were selected to recognize the Kaiser points. The results suggested that significant KE occurred in the three rock materials under the Brazilian test and that the KE directionality of rocks with different lithology varies greatly. The KE gradually fails as the rotation angle increases. The critical angles of granite, marble, and sandstone are 13°, 60°, and 5°, respectively. Besides, the directionality of the KE is closely related to the distribution of microcracks inside the rock and the critical stress of crack propagation. This study could provide a reference for experimental design and error analysis of in situ stress measurement by the acoustic emission method in civil and geotechnical engineering.

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岩石岩性和装弹方向对岩石应力记忆的影响

凯撒效应（Kaiser effect，KE）是岩石应力记忆的一种表现形式，因其方便、经济而被广泛应用于原位应力测量。然而，岩石岩性和方向性对 KE 的影响尚未得到解答。为了解决这个问题，本研究对三种类型的岩石盘进行了三阶段加载巴西试验。在第三阶段加载前，试样以一定的旋转角度θ（5°-90°）旋转，并选择跳点法和双线性回归法来识别 Kaiser 点。结果表明，在巴西试验中，三种岩石材料都出现了明显的KE现象，而且不同岩性岩石的KE方向性差异很大。随着旋转角度的增大，KE逐渐失效。花岗岩、大理石和砂岩的临界角分别为 13°、60° 和 5°。此外，KE 的方向性与岩石内部微裂缝的分布和裂缝扩展的临界应力密切相关。本研究可为土木工程和岩土工程中采用声发射法进行原位应力测量的实验设计和误差分析提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Testing and Evaluation 工程技术-材料科学：表征与测试

CiteScore

2.30

自引率

8.30%

发文量

221

审稿时长

6.7 months

期刊介绍： This journal is published in six issues per year. Some issues, in whole or in part, may be Special Issues focused on a topic of interest to our readers. This flagship ASTM journal is a multi-disciplinary forum for the applied sciences and engineering. Published bimonthly, the Journal of Testing and Evaluation presents new technical information, derived from field and laboratory testing, on the performance, quantitative characterization, and evaluation of materials. Papers present new methods and data along with critical evaluations; report users'' experience with test methods and results of interlaboratory testing and analysis; and stimulate new ideas in the fields of testing and evaluation. Major topic areas are fatigue and fracture, mechanical testing, and fire testing. Also publishes review articles, technical notes, research briefs and commentary.