Deformation characteristics and seepage mechanism of fractured rock mass under triaxial compression process

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2025-05-22 DOI:10.1016/j.sandf.2025.101630

Jilu Zhang , Xiaohan Zhou , Xinrong Liu , Yang Kong , Bin Xu , Lojain Suliman

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引用次数: 0

Abstract

Understanding the gas seepage characteristics within fractured rock masses is of great significance for the prediction and prevention of hazardous gases in underground engineering. The formation is actually under a triaxial non-uniform stress state as a result of geological tectonic forces. Few studies on gas seepage take into account various stress situations. In this study, the flow characteristics of precast fractured rock masses were investigated through laboratory triaxial tests. The research results show that the volume strain of precast fracture changes from expansion to contraction with the decrease of the fracture angle under axial load. The fracture permeability decreases with the increase of axial strain before rock mass failure. After failure, the increase in permeability is not only related to the confining pressure and fracture angle but also has a significant correlation with the failure mode. Considering the triaxial non-uniform stress state, a coupled calculation model for seepage-stress-damage was established, and the calculation method was verified to effectively reflect the deformation and seepage characteristics of fractures. The lateral force on the fracture surface mainly causes the permeability of precast fractures to increase, and the increase extent of fracture permeability is negatively correlated with the fracture angle and elastic modulus.

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裂隙岩体三轴压缩变形特征及渗流机理

了解裂隙岩体内气体渗流特征对地下工程有害气体的预测和防治具有重要意义。由于地质构造力的作用，该地层实际上处于三轴非均匀应力状态。很少有关于气体渗流的研究考虑到各种应力情况。本文通过室内三轴试验研究了预制裂隙岩体的流动特性。研究结果表明：在轴向载荷作用下，随着断裂角度的减小，预制构件的体应变由膨胀变为收缩；岩体破坏前，裂隙渗透率随轴向应变的增大而减小。破坏后渗透率的增加不仅与围压、破裂角有关，还与破坏模式有显著的相关性。考虑三轴非均匀应力状态，建立了渗流-应力-损伤耦合计算模型，并验证了该计算方法能有效反映裂隙变形和渗流特征。断裂面上的侧向力主要导致预制裂缝渗透性增加，裂缝渗透性增加的程度与断裂角度和弹性模量呈负相关。

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

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.