湿润和干燥循环对具有不同表面形貌的两种不同类型岩石之间不连续面的剪切行为的影响

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Qiong Wu, Yue Qin, Huiming Tang, Zhen Meng, Changdong Li, Sha Lu
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引用次数: 0

摘要

湿润和干燥周期(WDCs)对采用不同接壁材料(DDJMs)的不连续面的剪切行为有重大影响。这种影响对于合理评估软硬夹层岩石边坡在水位波动下的长期稳定性至关重要。由于从野外采集的天然不连续面的表面形貌各不相同,因此在具有相同表面形貌的天然不连续面试样上进行对比实验具有挑战性。为了解决这个问题,我们采用了三维表面形貌重建技术,从中国三峡库区典型的易滑动地层中采集到三种表面形貌的 DDJM 试样。在本研究中,WDC 对 DDJM 表面形貌的影响可以忽略不计;DDJM 剪切行为的变化与 WDC 引起的接合壁削弱密切相关;接合壁削弱对 DDJM 剪切行为恶化的影响程度受接合粗糙度系数和法向应力的交互影响,并与之呈正相关。这些结果将有助于更好地理解三峡库区及其他库区水位波动诱发的软硬夹层岩质边坡稳定性的演变过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Influence of wetting and drying cycles on the shear behavior of discontinuities between two different rock types with various surface topographies

Influence of wetting and drying cycles on the shear behavior of discontinuities between two different rock types with various surface topographies

Wetting and drying cycles (WDCs) have a significant impact on the shear behavior of discontinuities with different joint wall materials (DDJMs). This influence is crucial for the reasonable evaluation of the long-term stability of soft and hard interbedded rock slopes under water level fluctuations. As the surface topographies of natural discontinuities collected from the field vary, conducting comparative experiments on natural discontinuity specimens with identical surface topographies is challenging. To solve this problem, a 3D surface topography reconstruction technique was employed to obtain DDJM specimens with three types of surface topographies collected from a typical sliding-prone stratum in the Three Gorges Reservoir area, China. A series of experiments, including computed tomography scanning, 3D laser scanning, and direct shear tests, were conducted to investigate the influence of WDCs on the micro- and macroproperties of joint walls, surface topographies, and shear behavior of DDJMs. The experimental results showed that repeated WDC treatments caused the degradation of the microstructures and macroscopic physical properties of the studied joint walls, and the more severely weakened joint wall played a predominant role in reducing the shear strength of DDJMs. The influence of WDCs on the surface topographies of DDJMs was negligible in this study; changes in the shear behavior of DDJMs were closely associated with the weakening of joint walls induced by WDCs; and the impact degree of joint wall weakening on the deterioration of the shear behavior of DDJMs was interactively influenced by and positively correlated with both the joint roughness coefficient and normal stress. These results will contribute to a better understanding of the evolution of the stability of soft and hard interbedded rock slopes induced by water level fluctuations in the Three Gorges Reservoir area and other reservoir regions.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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