Experimental investigation on shear behaviors of saw-toothed sandstone joints under various water vapor humidity conditions

IF 2.8 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Earth Sciences Pub Date : 2024-11-11 DOI:10.1007/s12665-024-11948-w

Shuqi Ma, Zhaoyuan Zhang, Hongfei Duan, Jianbiao Bai, Hua Chen, Guanghao Li, Yuanzhen Xu, Qilin Yan

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Abstract

Humidity could significantly affect the failure morphology and characteristics of rock joints. This study experimentally investigated the effects of humidity on the mechanical behavior of saw-toothed sandstone joints. Various humidity conditions were created using the chemical thermodynamic vapor–liquid equilibrium principle, which is a non-contact and non-destructive humidity curing method. The rock joints were maintained under these humidity conditions for up to two months, followed by joint shear tests to assess the impact of water vapor on shear performance. The results show that rock joints are relatively more sensitive to humidity under higher normal stress. The second peak shear stress phenomenon occurs in saw-toothed joint samples with large asperity angle. For rock joints under the same normal stress, the greater the humidity the smaller the second peak shear stress. High humidity significantly influences the deformation behavior of sandstone joints by shortening the peak shear displacement and reducing joint dilation. Furthermore, under low and medium humidity, spalling occurs around asperities and cracks are not generated within the body of rock samples. In contrast, for rock joints subjected to high humidity, cracks are generated and extended within the joint body.

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不同水汽湿度条件下锯齿状砂岩接缝剪切行为的实验研究

湿度会严重影响岩石节理的破坏形态和特征。本研究通过实验研究了湿度对锯齿状砂岩节理力学行为的影响。利用化学热力学汽液平衡原理创造了各种湿度条件，这是一种非接触、非破坏性的湿度固化方法。岩石接缝在这些湿度条件下保持长达两个月，然后进行接缝剪切试验，以评估水蒸气对剪切性能的影响。结果表明，在法向应力较高的情况下，岩石节理对湿度的敏感性相对较高。第二剪应力峰值现象出现在具有较大突出角的锯齿形接缝样本中。对于相同法向应力下的岩石节理，湿度越大，第二剪应力峰值越小。高湿度通过缩短峰值剪切位移和减少节理扩张，对砂岩节理的变形行为产生了重大影响。此外，在低湿度和中湿度条件下，剥落发生在尖角周围，岩石样本内部不会产生裂缝。相反，在高湿度条件下，岩石节理会产生裂缝，并在节理体内部扩展。

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来源期刊

Environmental Earth Sciences 环境科学-地球科学综合

CiteScore

5.10

自引率

3.60%

发文量

494

审稿时长

8.3 months

期刊介绍： Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.