Volume 24 Issue 6
Dec.  2018
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Article Navigation >  Journal of Geomechanics  > 2018  >  24(6): 795-802
ZHOU Zhiguo, ZHANG Yunyan, FU Bichang, et al., 2018. A STUDY ON DYNAMIC CHARACTERISTICS OF SANDSHALE ELUVIAL LATERITE AT KUNMING CHANGSHUI INTERNATIONAL AIRPORT. Journal of Geomechanics, 24 (6): 795-802. DOI: 10.12090/j.issn.1006-6616.2018.24.06.082
Citation: ZHOU Zhiguo, ZHANG Yunyan, FU Bichang, et al., 2018. A STUDY ON DYNAMIC CHARACTERISTICS OF SANDSHALE ELUVIAL LATERITE AT KUNMING CHANGSHUI INTERNATIONAL AIRPORT. Journal of Geomechanics, 24 (6): 795-802. DOI: 10.12090/j.issn.1006-6616.2018.24.06.082
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A STUDY ON DYNAMIC CHARACTERISTICS OF SANDSHALE ELUVIAL LATERITE AT KUNMING CHANGSHUI INTERNATIONAL AIRPORT

doi: 10.12090/j.issn.1006-6616.2018.24.06.082
  • 1.

    Land Resources and Engineering School, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

  • 2.

    Yuxi water conservancy and Electric Power Survey and Design Institute, Yuxi 653100, Yunnan, China

  • 3.

    Oxbridge College, Kunming University of Science and Technology, Kunming 650101, Yunnan, China

More Information
  • Received: 2018-01-11
  • Revised: 2018-11-01
  • Published: 2018-12-01
    Abstract
  • The eluvial laterite of Kunming Changshui International Airport is not only an important land resources in the region, but also the construction foundation for a variety of engineering construction. Due to the cracking characteristics, the laterite is seriously cracked and deformed under the modern climatic conditions, and its engineering properties are deteriorating. A series of consolidated undrained dynamic triaxial tests were carried out on sandshale eluvial laterite at Kunming Changshui International Airport. The results of deformation tests show that the eluvial laterite of sandshale has yield strain in a cyclic dynamic stress; the dynamic elastic modulus would increase with the growing of the consolidation confining pressure at the same strain level; moreover, the damping ratio of the eluvial laterite in sandshale would decrease sharply when the dynamic strain increases slightly, and level off gradually with the growing of dynamic strain afterwards. The dynamic strength tests show that he dynamic failure strength of the eluvial laterite in sandshale would increase with the growing of consolidation confining pressure, and the dynamic shear strength index of the eluvial laterite in sandshale at consolidation ratio Kc=1 could is obtained (that is cd=25.182 kPa and φd=12.985°), which was compared and analyzed with the shear strength index obtained under the consolidated undrained static triaxial test. In fact, the shear failure of laterite under dynamic action is due to the loss of a large amount of weakly bound water in its soil, which leads to the reduction of the cohesive force between its particles, resulting in the relative displacement of the internal units. Combined with the features of the earthquake in Kunming, the obtained research results on the dynamic characteristics of the eluvial laterite in sandshale have great guiding significance for the in-depth study of the laterite system and engineering practice.

     

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