Thermo-mechanical effect on the anisotropic permeability of a mudstone

被引：1

作者：

Yu, Hongdan ^{[1
]}

Lu, Chen ^{[1
,2
]}

Chen, Weizhong ^{[1
]}

Yang, Diansen ^{[1
]}

Li, Honghui ^{[3
]}

机构：

[1] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] China Inst Radiat Protect, High Level Radwaste Disposal Safety Div, Management Dept, Taiyuan 030006, Peoples R China

来源：

CASE STUDIES IN THERMAL ENGINEERING | 2023年 / 41卷

基金：

中国国家自然科学基金;

关键词：

Tamusu mudstone; Thermal effect; Anisotropy; Hydraulic properties; BOOM CLAY; HYDRAULIC CONDUCTIVITY; THERMAL-EXPANSION; OPALINUS CLAY; TEMPERATURE; WATER; BENTONITE; BEHAVIOR; IMPACT; DISPOSAL;

D O I：

10.1016/j.csite.2022.102625

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Tamusu mudstone is a candidate geological medium for high-level radioactive waste disposal in China. This paper investigates its anisotropic hydraulic properties. Permeability measurements were conducted on two kinds of samples, i.e., along the directions perpendicular and parallel to the beddings, under different stress conditions with heating-cooling cycles (20 -> 40 -> 60 -> 80 -> 60 -> 40 -> 20 degrees C). The results confirmed the hydraulic anisotropy of Tamusu mudstone. Increasing lithostatic pressure decreases the intrinsic permeability k and hydraulic conductivity K and decreases the hydraulic anisotropy of Tamusu mudstone. The temperature significantly af-fects the hydraulic properties: the k values exhibit a negative correlation with temperature. A notable variation in parallel hydraulic properties upon temperature elevation indicates that the thermal effect is more crucial in the direction parallel at low lithostatic pressure. A notable effect of thermal paths on the hydraulic properties of Tamusu mudstone was exhibited through the different K or k at the same temperatures before and after heating-cooling cycles.

引用

页数：11

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