Dynamics stress–strain behavior of Tianshui soils

详细信息    查看全文

• 作者：Zelin Zhang ; Tao Wang ; Shuren Wu ; Huiming Tang ; Peng Xin ; Changyu Liang
• 关键词：Dynamic triaxial test ; Loess ; Weathered red mudstone (WRM) ; Young’s modulus ; Stress–strain behavior
• 刊名：Landslides
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：14
• 期：1
• 页码：323-335
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Natural Hazards; Geography, general; Agriculture; Civil Engineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1612-5118
• 卷排序：14

文摘

Tianshui City is located in a seismically active region of China. Historically, many earthquakes with magnitudes of 6.0–8.0 have been reported in this area, and most of loess–red mudstone landslides in this area are known to have been triggered by earthquakes. However, the soil dynamics under earthquakes in the Tianshui area have been little studied. Therefore, to understand the dynamic stress–strain behavior of undisturbed soils during the earthquake, cyclic and shear strength tests were conducted on soil samples (loess and weathered red mudstone) obtained from Tianshui in a cyclic triaxial test system. Two types of laboratory tests were carried out on two kinds of soils. The first type involved the tests with different cyclic stress ratios applied and the number of cycles N more than 20, while the second type are series of stress-controlled undrained reverse-shear tests. By doing so, the differences on stress condition on the behavior of Young’s modulus E_max, stress–strain and shear strength were measured. In addition, tests modeling natural seismic loading were also carried out for comparative purposes. Some residual shear behaviors were also recognized. The results of a series of tests designed to study the stress–strain behavior of undisturbed soils under repeated loading are presented. These tests will provide useful parameters (e.g. λ_d and E_dmax) for analysis of slope stability during earthquakes and earthquake-resistant design.