海底强风化花岗岩K0固结三轴试验尺寸效应

来源期刊:中南大学学报(自然科学版)2020年第6期

论文作者:陈志波 李传懿

文章页码:1646 - 1654

关键词:强风化花岗岩;三轴试验;K0固结;尺寸效应;颗粒破碎

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

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。

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.

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