Rheological characteristics and seepage laws of sandstone specimens containing an inclined single fracture under three-dimensional stress

IF 5.8 4区 工程技术 Q1 MECHANICS Applied Rheology Pub Date : 2024-08-22 DOI:10.1515/arh-2024-0013
Jinzhou Tang, Wenhao Tang, Ke Yang, Zhiqiang Yin, Qinjie Liu, Minke Duan, Rong Liu
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Abstract

The rheological properties and seepage laws of fractured rock masses have a highly significant impact on the long-term stability of engineering rock masses. To study the rheological properties and seepage laws, rheological experiments under different loading paths were designed and conducted on sandstone samples with pre-fabricated single fractures. The results indicated that (1) as the axial stress or pore pressure increases, or the confining pressure decreases, the creep strain (both axial and radial directions) during the creep tests increases, and their stain rate decreases; (2) compared to the pore pressure, the axial stress and confining pressure have a more significant influence on the flow rate during the creep process. As the axial stress increases or the confining pressure decreases, the flow rate shows an increasing trend; (3) the higher connectivity results in higher final flow in an exponential function, indicating that the connectivity ratios can well reflect the permeability of the fractures; (4) the changes in the stress field may lead to the transition of the surrounding rock from a stable state to an unstable state, i.e., the occurrence of creep failure, or water inrush. Therefore, when the state of the surrounding rock changes, strengthened monitoring and proper preventive measures should be implemented.
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三维应力作用下含有倾斜单一断裂的砂岩试样的流变特性和渗流规律
断裂岩体的流变特性和渗流规律对工程岩体的长期稳定性有非常重要的影响。为了研究流变特性和渗流规律,设计并在预制单裂缝的砂岩样品上进行了不同加载路径下的流变实验。结果表明:(1) 随着轴向应力或孔隙压力的增大,或约束压力的减小,蠕变试验过程中的蠕变应变(包括轴向和径向)增大,而其浸润速率减小;(2) 与孔隙压力相比,轴向应力和约束压力对蠕变过程中的流动速率有更显著的影响。随着轴向应力的增大或约束压力的减小,流速呈上升趋势;(3)在指数函数中,连通性越高,最终流量越大,这表明连通比能很好地反映裂缝的渗透性;(4)应力场的变化可能导致围岩从稳定状态过渡到不稳定状态,即发生蠕变破坏或涌水。因此,当围岩状态发生变化时,应加强监测并采取适当的预防措施。
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来源期刊
Applied Rheology
Applied Rheology 物理-力学
CiteScore
3.00
自引率
5.60%
发文量
7
审稿时长
>12 weeks
期刊介绍: Applied Rheology is a peer-reviewed, open access, electronic journal devoted to the publication in the field of applied rheology. The journal provides the readers with free, instant, and permanent access to all content worldwide; and the authors with extensive promotion of published articles, long-time preservation, language-correction services, no space constraints and immediate publication.
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