长江科学院院报2016，Vol.33Issue(9)：78-82,5.DOI:10.11988/ckyyb.20150567
红层软岩单轴抗压强度的尺寸效应
Size Effect on Uniaxial Compressive Strength of Red Bed Soft Rock
摘要
Abstract
The size effect of red bed soft rock's uniaxial compressive strength was researched in this paper.The testing samples are taken from Humaling Tunnel of the Xiaguan-Guangyuan Section of Lanzhou-Chongqing Railway,Dingxi city,Gansu Province,China.The samples are of cylindrical shape with different ratios of height to diameter(diameter 50mm,height 20-100 mm).Results show that the red bed soft rock has obvious size effect.The dimensionless size effect coefficient is defined as the ratio of uniaxial compressive strength of nonstandard sample to that of standard sam-ple.Fitting of test data shows that size effect coefficient is linearly related with height to diameter ratio and average elastic modulus.A mathematical model is established to illustrate this linear function.When the height to diameter ra-tio is smaller than 2.0,the size effect coefficient decreases and then increases with the increase of the ratio.The height to diameter ratio corresponding to minimum coefficient is obtained.Moreover,stress analysis is conducted to research the destruction patterns of red bed soft rock,and the causes of size effect coefficient variation are given.关键词
红层软岩/尺寸效应/拟合效果/弹性模量/高径比Key words
red bed soft rock/size effect/fitting result/elastic modulus/ratio of height to diameter分类
建筑与水利引用本文复制引用
吕龙龙,宋丽,廖红建,李杭州..红层软岩单轴抗压强度的尺寸效应[J].长江科学院院报,2016,33(9):78-82,5.基金项目
岩土力学与工程国家重点实验室项目（201105047）；中央高校基本科研业务费专项资金项目 （）
