不同应力路径下石灰岩渗透特性演变研究

IF 5.8 4区 工程技术 Q1 MECHANICS Applied Rheology Pub Date : 2024-04-05 DOI:10.1515/arh-2024-0003
Gang Huang, Gang Lu, Ji Zhang, Fengjun Zhou, Dongwei Li
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引用次数: 0

摘要

应力路径的变化与岩石变形和强度的影响有很大关系。但地下岩体处于应力场、渗流场等耦合变化的工程环境中,岩体中流体流动规律复杂多变。应力场的变化对岩体的渗流特性有重要影响,因此有必要研究不同应力路径下岩体渗透率的演化规律。本研究以石灰岩为研究对象,进行了三轴卸荷渗流力学试验,根据试验结果分析了石灰岩试件渗透性的演变规律。结果表明,在常规三轴加载渗流试验中,石灰岩的渗透率在岩石应力达到峰值强度之前降低,之后升高。增加轴向压力卸载周围压力压缩段,渗透率损失率和有效应力符合高斯分布函数的变化规律。在恒定轴压卸荷围压作用下,随着卸荷量的增加,渗透率变化率呈缓慢上升趋势,在卸荷段后期,渗透率变化率呈猛增趋势。卸载段渗透率变化率和累积卸载量符合指数函数的变化规律。蠕变卸荷压力渗流试验发现,卸荷压力阶段应变-时间和渗透率-时间演化特征均符合指数函数变化规律。本研究的实验结果可为地下工程复杂应力条件下低渗透性岩体的渗透性分析提供重要的实验和理论依据。
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Study on the evolution of permeability properties of limestone under different stress paths
Stress path change has a great relationship with the effect of deformation and strength of rock. However, the underground rock body is in the engineering environment where the stress field, seepage field, and other fields are coupled to change, the law of fluid flow in the rock body is complex and variable. The change in the stress field has an important effect on the seepage characteristics of rock body; therefore, it is necessary to study the pattern of rock permeability evolution pattern by different stress paths. This study is based on the study of limestone, conducting triaxial unloading seepage mechanics experiments, the evolution of permeability properties of limestone specimens was analyzed based on the test results. The results show that in the conventional triaxial loading seepage test, the permeability of the limestone decreases before the rock stress reaches the peak intensity and increases after that. Increasing axial pressure unloading surrounding pressure compression section, permeability loss rate and effective stress are in line with the changing law of Gaussian distribution function. Under the action of constant axial pressure unloading surrounding pressure, with the increase in unloading amount, the permeability rate of change appears to increase slowly, and in the late stage of unloading section, the permeability rate of change appears to surge. Unloading section permeability change rate and cumulative unloading amount are in line with the law of change of the exponential function. Creep unloading pressure seepage test found that unloading pressure stage strain-time and permeability-time evolution characteristics are in line with the exponential rule of change. The experimental results of this study can provide an important experimental and theoretical basis for the permeability analysis of low-permeability rock body under complex stress conditions in underground engineering.
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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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