Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (5): 1338-1346.doi: 10.13278/j.cnki.jjuese.20210021

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Experimental Study on Cracking Characteristics of Loess Steep Slope Under Intensive Rainfall

Wang Lei1,2, Li Rongjian1, Yang Zhengwu3, Liu Junding1, Bai Weishi1   

  1. 1. Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China;
    2. Architectural Engineering Institute, Yan'an University, Yan'an 716000, Shaanxi, China;
    3. The IT Electronics Eleventh Design & Research Institute Scientific and Technological Engineering Corporation Limited, Xi'an 710100, China
  • Received:2021-01-20 Online:2021-09-26 Published:2021-09-29
  • Supported by:
    Supported by the National Natural Science Foundation of China (51768073), the Special Scientific Research Project of Shaanxi Provincial Department of Education (20JK0991) and the Research Program of Yan'an University (YDQ2019-33)

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Abstract: Instability of loess slopes induced by rainfall is severely destructive. In order to study the cracking characteristics of loess steep slopes under intensive rainfall, the field artificially simulated moderate rain and heave rain tests of loess steep slopes were carried out in Wuqi, northern Shaanxi Province. The water content and earth pressure of slopes were analyzed, along with their cracking characteristics and cracking patterns. The engineering effects of geotextile isolation grooves were summarized. The results showed that the rise of water content and earth pressure of the loess steep slope was little after 24 h moderate rain; While a thicker adjacent saturated zone was formed on the surface after 144 h heave rain, and the earth pressure increased significantly. The main failure sequence of the loess steep slope under the condition of 144 h heavy rain was top cracking, surface bulging, and local sliding in. The top crack of the slope is a precursor, and the failure mode of the slope is a shallow failure from the top to the surface of the slope.

Key words: intensive rainfall, loess steep slope, cracking characteristics, isolation groove, lateral constraint

CLC Number: 

  • TU43
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