›› 2013, Vol. 34 ›› Issue (5): 1360-1366.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on delayed effect of landslides caused by air pressure under heavy rainfall

HAN Tong-chun1, 2，MA Shi-guo1, 2，XU Ri-qing1, 2   

  1. 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310058, China
  • Received:2012-03-11 Online:2013-05-10 Published:2013-05-14

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Abstract: Under the intense rainfall infiltration, the air in the shallow slope is likely to be confined, and the pore air pressure in air-confining condition increases constantly as the infiltration of rainfall. The physical meaning of the air-closing pressure is illustrated through the force analysis of the wetting front. Compared with the classical Green-Ampt infiltration model, the simplified infiltration model considering the air pressure is used to study the effects of air pressure on the infiltration rate and the moving wetting front. Then the infiltration process and stability analysis of a large area of shallow slope with bedrock beneath is studied through the simplified infiltration model. The results show that the air pressure in the air-confining condition reduces the infiltration rate and the safety factor remarkably, which could also reveal the reason that why some areas had frequent landslides after the rainfall. So considering air pressure for landslide forecasting is greatly significant.

Key words: air-closing pressure, rainfall infiltration, slope stability, delayed effect

CLC Number: 

  • TU 441
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