A Study of the Dynamic Strength Regional Characteristics of Percentile (Q3) Loess
详细信息
- 责任者：Wang Ping (Key Laboratory of Loess Earthquake Engineering ; Gansu Earthquake Administration ; CEA ; Lanzhou 730000 ; China) ; Wang Jun
- 刊名：Hydrogeology and Engineering Geology
- 出版年：2013
- 卷期：40(5)
- 关键词：黄土类土 ; loessial soil ; 抗剪强度 ; shear strength
- 页码：p.69-73,86
- 图表：6 illus., 2 tables, 11 refs.
- 分类号：1702
- issnNo：ISSN1000-3665
- isbnNo：CN11-2202/P
摘要
Based on Mohr-Coulomb failure criterion,the dynamic strength characteristics of undisturbed loess in Xining,Lanzhou,Xiji and Xi’an are studied through dynamic triaxial test. The regional characteristics ofstandard of consistency state of other soil types. This can explain the special traits ofclassification of consistency state.Key words: Guizhou red clay; water content ratio; liquid index; equivalent range of liquid void ratio,natural moisture content,plasticity index and dynamic shear strength with different vibration frequencies and natural conditions are analyzed. The research results show that the dynamic shear strength of loess increases when consolidation stress rises under the same water content condition. However,the increase trend is not direct proportional. From northwest to southeast the cohesive force of loess decreases and the change in internal friction angle trends to disperse with the cumulative effect of vibration frequency. Initial void ratio and water content of loess under natural state rise from northwest to southeast,and the dynamic cohesive force enhances. On the contrary,internal friction angle decreases with the change of characteristics.With the increasing trend of clay content of the disturbed loess from northwest to southeast,the dynamic cohesive force increases and the internal friction angle decreases in the different amplitudes. These conclusions enriche the evaluation theory of loess regional dynamic characteristics and it is a universal method to reduce the cost of different loess regional classifications.
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