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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第6期    总第310期    2020年6月

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文章编号:1672-7207(2020)06-1646-08
海底强风化花岗岩K0固结三轴试验尺寸效应
李传懿1, 2, 3,陈志波1, 2, 3

(1. 福州大学 环境与资源学院,福建 福州,350116;
2. 地质工程福建省高校工程研究中心,福建 福州,350116;
3. 自然资源部丘陵山地地质灾害防治重点实验室,福建 福州,350116
)

摘 要: 为了研究海洋地质条件下土体的尺寸效应及工程特性,采用三轴试验仪器对福建平潭某近海区海底的原状强风化花岗岩开展不同试样尺寸的K0固结三轴不排水剪切试验,分析试样尺寸对强风化花岗岩的应力-应变特性、临界状态线、抗剪强度指标的影响及土体颗粒破碎情况。研究结果表明:不同尺寸试样的应力-应变关系相似;尺寸较小试样的临界状态线斜率小于尺寸较大试样的临界状态线斜率;尺寸较小试样的抗剪强度指标大于尺寸较大试样的抗剪强度指标;颗粒破碎率随着试样尺寸的增大而增大;在工程实践中,应注意尺寸效应。

 

关键字: 强风化花岗岩;三轴试验;K0固结;尺寸效应;颗粒破碎

Specimen size effect of strongly weathered granite of seabed in triaxial tests under K0-consolidation condition
LI Chuanyi1, 2, 3, CHEN Zhibo1, 2, 3

1. College of Environment and Resources, Fuzhou University, Fuzhou 350116, China;
2. Fujian Provincial Universities Engineering Research Center of Geological Engineering, Fuzhou 350116, China;
3. Key Laboratory of Geohazard Prevention of Hilly Mountains, Ministry of Natural Resources, Fuzhou 350116, China

Abstract:In order to study the specimen size effect and engineering characteristics of soils under marine geological conditions, K0 consolidated-undrained triaxial tests with different specimen dimensions were performed on strongly weathered granite of a seabed of Pingtan island, Fujian Province. Differencs of the stress-strain behavior, critical state line, shear strength indexes and particle breakage between specimens at different sizes were studied, and the specimen size effect was discussed. The results show that the stress-strain relationship of specimens with different sizes is similar. The slope of critical state line of smaller specimen is less than that of larger specimen. The shear strength indexes decrease with the increase of specimen size. The particle breakage rate increases with the increase of specimen size. Specimen size effect in engineering practice should be paid attention.

 

Key words: strongly weathered granite; triaxial test; K0-consolidation; size effect; particle breakage

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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