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Landslides

, Volume 14, Issue 1, pp 323–335 | Cite as

Dynamics stress–strain behavior of Tianshui soils

  • Zelin Zhang
  • Tao Wang
  • Shuren Wu
  • Huiming Tang
  • Peng Xin
  • Changyu Liang
Original Paper

Abstract

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.

Keywords

Dynamic triaxial test Loess Weathered red mudstone (WRM) Young’s modulus Stress–strain behavior 

Notes

Acknowledgments

This study was sponsored by the National Natural Science Foundation of China (No. 41572313 and No. 41372374), Project of China geological survey (No. 12120114035501), and the Ministry of Science and Technology of China (No. 2012BAK10B02). The authors would like to thank Dr. Bin Huang for their test during the research period. The authors express their sincere thanks to the anonymous reviewers and the editor for their invaluable help and guidance throughout this research.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Institute of GeomechanicsChinese Academy of Geological SciencesBeijingChina
  2. 2.China University of GeosciencesWuhanChina

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