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[1]ZHENG Miaomiao,ZHENG Hong,LI Tonglu.Study on Physical-Mechanical Properties of Sliding Soil of Large-Scale Loess Landslides in Western Guanzhong[J].Research of Soil and Water Conservation,2016,23(01):343-348.

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Study on Physical-Mechanical Properties of Sliding Soil of Large-Scale Loess Landslides in Western Guanzhong

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 01 Page number: 343-348 Column: Public date: 2016-02-28

Title:: Study on Physical-Mechanical Properties of Sliding Soil of Large-Scale Loess Landslides in Western Guanzhong

Author(s):: ZHENG Miaomiao^1,2, ZHENG Hong¹, LI Tonglu¹; 1. School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China;
2. Shannxi Institute of Geo-Environment Monitoring, Xi’an 710054, China

Keywords:: loess landslides; sliding soil; physical properties; internal friction angle; cohesion; Pliocene clay

CLC:: P642.22

DOI:: -

Abstract:: We selected Jintai District of Baoji City as the study area to reveal the physical and mechanical characteristics of landslide by comparison and analysis of the composition, structure, physical and mechanical properties with two kinds of sliding zone soil: Sanmen group red clay and Hipparion laterite. We sampled of two kinds of sliding zone to analyze the clay contents of two kinds of clay soils by pipette the dispersion method, and to do the X-ray diffraction quantitative test for clay minerals, to observe the microstructure after amplification by scanning electron microscopy, to discriminate the expansibility with Williams expansion criterion, to do the disintegration test with one sample after drying with 105℃ constant temperature and the other sample with natural water content, and to do the indoor slow shear test in both natural and saturated state. The results show that these two kinds of clay soils belong to the medium to strong expansive soil, easily collapse after wetting. There is a great difference between the peak strength and residual strength of two kinds of clay soils. Cohesion is an average reduction of 2/3, and the strength has obvious effect with containing water. The cohesive force decreased by 30% and the internal friction angle decreased by 25%, showing that the peak residual value of the clay causes the larger down thrust when landslides occurs, and leads to instant sliding at high speed sliding along the sliding bed surface.

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