›› 2013, Vol. 34 ›› Issue (7): 2009-2016.

• Geotechnical Engineering • Previous Articles     Next Articles

Geological features of loess landslide at Lüliang airport and its 3D stability analysis

GU Tian-feng1, 2，WANG Jia-ding1，WANG Nian-qin3   

  1. 1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China; 2. Zhongjiao Tongli Construction Co., Ltd., Xi’an 710075, China; 3. Department of Geology and Environment Engineering, Xi’an University of Science & Technology, Xi’an 710054, China
  • Received:2012-06-13 Online:2013-07-10 Published:2013-07-15

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Abstract: The Lüliang airport landslide is a large loess landslide which was found in early construction of the airport. Due to airfield runway next to the northeastern of the landslide, the landslide makes a large influence on the engineering construction and safe operation. In order to assess landslide risk and prevent its damage, the geological features and formation mechanism of the landslide are analyzed based on the detailed engineering geological investigation and testing work. The landslide is considered as a multilayer landslide developed in loess layer. There are three steps on the landslide; and the main sliding surface locates in the paleosol layer of Lishi loess. Three-dimensional geological model is established using GIS; and the stability of the landslide is evaluated by limit equilibrium method and shear strength reduction method. Results from three-dimensional limit equilibrium analyses show that most parts of the landslide are stable or basic stable in natural state. From strength reduction analysis, the safety factor of the whole slope is 1.26. It is shown that the most dangerous areas appear in the posterior margin of landslide II and landslide I-3. In case of loading or rainfall condition, it is likely to slide again. In conclusion, three-dimensional stability analysis can more truly reflect the actual state of landslides, especially for complex landslide.

Key words: loess landslide, stability analysis, 3D limit equilibrium method, numerical analysis

CLC Number: 

  • P 642.22
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