地质力学学报2017，Vol.23Issue(1)：105-114,10.
汶川地震区崩滑堆积体强度现场直剪试验研究
IN-SITU DIRECT SHEARING TEST ON LANDSLIDE ACCUMULATION BODY INTENSITY OF WENCHUAN EARTHQUAKE REGION
摘要
Abstract
In this paper,the earthquake-induced loose sediments near Xuankou,Wenchuan County,Sichuan province are selected to conduct the in-situ direct shear tests of undisturbed gravel soil and remolded soil sample direct shear tests with different situations to explore the shear properties of gravel soils under different vertical pressure,particle size composition and moisture.The study results show that (1) Gravel soils which have similar geological genesis,similar rock mass structure,different size composition and poor gradation have similar shear properties and shear strength.(2) The shear strength of undisturbed gravel soil samples is significantly higher than remolded samples with the same dry density and moisture.(3) Strain hardening strength of well-graded gravel soils is slightly higher than bad-graded gravel soil,when the content of coarse particle whose size is greater than 5 mm is more than 42.9％,friction angle increases with increment of coarse-grained contents,while cohesion decreases firstly and then increases.(4) When moisture content is more than 15.8％,there is a negative correlation between shear strength indexes and moisture content,with gradual increase of moisture,the shear strength of gravel soil will gradually reduce,among which the decrease of cohesion is more remarkable than internal friction angle.Considering others' research and experimental results,we suggest that the gravel soils having similar structure components in Wenchuan earthquake area can select the shear strength indexes c of 15 ± 3kPa and Phi of 30° ± 2°.关键词
汶川地震/崩滑堆积体/剪切强度/现场试验/斜坡稳定性Key words
Wenchuan earthquake/landslide accumulation body/shear strength/in-situ test/slope stability分类
天文与地球科学引用本文复制引用
吴瑞安,张永双,王献礼,姚鑫,杨志华,杜国梁..汶川地震区崩滑堆积体强度现场直剪试验研究[J].地质力学学报,2017,23(1):105-114,10.基金项目
中国地质调查局项目(1212010914025) （1212010914025）
国家十二五科技支撑课题(2011BAK12B09) （2011BAK12B09）
