Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1756-1766.doi: 10.13278/j.cnki.jjuese.20170133

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Engineering Geological Characteristics of Super High Rise and Thick Loess Foundation in Qingyang Area

Song Yu1,2, Luo Xiaobo1, Lu Chenggong1, Chen Zhichao1, Lu Guowen1   

  1. 1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
    2. Western Center of Disaster Mitigation in Civil Engineering, Ministry of Education, Lanzhou 730050, China
  • Received:2017-05-11 Published:2018-11-26
  • Supported by:
    Supported by National Natural Science Foundation of China(51468040)

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Abstract: In order to deeply understand the geological features of loess, the super high-rise and thick loess foundation was selected as the study object in Qingyang, to investigate the physical and mechanical properties of Longdong loess. Mainly through in-situ and indoor experiments, all sides of loess engineering performance were comprehensively analyzed and evaluated, including the under structure, depth of distribution, liquid limit, plastic limit, index of plasticity, void ratio, collapsible deformation, shear wave velocity, bearing capacity of foundation, shear strength, and so on. The results showed that:Malan loess within 5.0 m had strong collapsibility, small cohesive force, and large compressibility; with the gradual increase of loess thickness, the cohesive force of Lishi loess and Wucheng loess increased, while the compressibility decreased, showing a slight to moderate collapsibility;when the pressure of Malan loess exceeded 400 kPa, the pressure of Lishi loess was greater than 600 kPa, and that of Wucheng loess was greater than 200 kPa, with no collapsibility; the maximum dry density was 1.67-1.76 g/cm3, and the optimal water content was between 16.6% and 17.7% within 15.0 m; the high water content was relatively concentrated in the region below 62.0 m of groundwater level and above 90.0% of saturation.

Key words: Longdong loess, live experiment, indoor experiment, project performance, collapsibility

CLC Number: 

  • TU192
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