摘要
粗粒组含量、粗粒粒径对细粒类填土应力-应变特性及抗剪强度具有重要影响。通过单变量原位大面积剪切试验分析了不同粗粒组含量下细粒类填土的应力-应变特性和抗剪强度,并对原位测试土体进行室内试验的颗粒分析,进而分析粒径对细粒类填土的抗剪强度和应力-应变特性的影响规律。试验结果分析表明:土样的峰值剪应力与粗粒组含量呈正相关关系,当试样颗粒限定粒径d_(60)在0.020～0.050 mm时,随着颗粒限定粒径的增大土体的峰值强度和内摩擦角φ增大,而粘聚力c缓慢减小;当颗粒粒径d_(60)大于0.050 mm,随着颗粒限定粒径的增大,土体的峰值强度和内摩擦角φ增大幅度、粘聚力c减小幅度均加大。
The content of coarse grained soils and their grain sizes have an important influence on the stress-strain characteristics of fined grained soil mixtures. This paper presents the valuation influence of coarse grain content on the geotechnical properties of fine grained soil mixtures throughout large scale in-situ direct shear tests. After each test, the grain size distribution of each serious of sample were laboratory tested. The results indicate that: The peak shear strength value is proportional to the content of coarse grained materials. When the grain size range D60 is limited within 0.02 to 0.05 mm, both the shear strength and internal friction angle increase with the increase of grain size;when the grain size D60 is greater than 0.05mm, with the increase of grain size, both the rate of internal friction angle increase and the apparent cohesion reduction rate increase.
作者
张云毅
吴玉鹏
张可能
薛彦琪
秦立斌
廖阳
ZHANG Yunyi;WU Yupeng;ZHANG Keneng;XUE Yanqi;QIN Libin;LIAO Yang(School of Geosciences and Info-Physics,Central South University,Changsha 410083;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University),Ministry of Education,Changsha 410083;Hunan Construction Engineering Group Co.,Changsha 410004)
出处
《土工基础》
2019年第1期39-43,共5页
Soil Engineering and Foundation
关键词
细粒类填土
粗粒组
应力应变特性
抗剪强度
原位直剪试验
fine grained backfill soils
coarse grained group
stress-strain characteristics
shear strength
in-situ large scale directd hear test
