Soil Engineering and Foundation

Soil Engineering and Foundation ›› 2019, Vol. 33 ›› Issue (6): 660-664.

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Evaluation of the Niushuoshan Landslide in Nanjing

The soil and rock strata of Niushuoshan landslide in Nanjing city, are mainly comprised of volcanic tuff of Jurassic Dawangshan Formation (J3d). Field investigation results showed that the landslide had historically undergone a large deformation, which is called an ancient landslide. The investigation results indicated that the highly weathered stratum leads to the formation of relatively impermeable kaolin aquitard layer, and the reduced mechanical properties result in the slope instability concerns. Cracks are well developed in moderately weathered strata, which are beneficial to the surface runoff seepage and to the formation of confined aquitard under the highly weathered stratum. The transient flow was evaluated by the finite element method, when the rainfall intensity reaches 10~20 mm/d and durations are between 4 and 6 days, the slope may reach its stability limit state. The excess pore pressure in the highly weathered strata is not easily to dissipate, which leads to a long period of continuous deformation of the slope and the stability could not be recovered in a short time.   

  1. (1.No.3 Geological Division, Jiangsu Bureau of Geology and Mineral Resource, Zhenjiang 212001;
    2.Department of Earth Science, Nanjing University, Nanjing 210093)
  • Received:2019-02-13 Revised:2019-03-27 Online:2019-12-28 Published:2019-12-28

Abstract: The soil and rock strata of Niushuoshan landslide in Nanjing city, are mainly comprised of volcanic tuff of Jurassic Dawangshan Formation (J3d). Field investigation results showed that the landslide had historically undergone a large deformation, which is called an ancient landslide. The investigation results indicated that the highly weathered stratum leads to the formation of relatively impermeable kaolin aquitard layer, and the reduced mechanical properties result in the slope instability concerns. Cracks are well developed in moderately weathered strata, which are beneficial to the surface runoff seepage and to the formation of confined aquitard under the highly weathered stratum. The transient flow was evaluated by the finite element method, when the rainfall intensity reaches 10~20 mm/d and durations are between 4 and 6 days, the slope may reach its stability limit state. The excess pore pressure in the highly weathered strata is not easily to dissipate, which leads to a long period of continuous deformation of the slope and the stability could not be recovered in a short time.

Key words: Landslide, Evaluations, Niushoushan

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