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Geomechanics and Engineering
  Volume 12, Number 3, March 2017 , pages 399-415

Tests of the interface between structures and filling soil of mountain area airport
Xueyun Wu and Jun Yang

    A series of direct shear tests were conducted to investigate the frictional properties of the interface between structures and the filling soil of Chongqing airport fourth stage expansion project. Two types of structures are investigated, one is low carbon steel and the other is the bedrock sampled from the site. The influence of soil water content, surface roughness and material types of structure were analyzed. The tests show that the interface friction and shear displacement curve has no softening stage and the curve shape is close to the Clough-Duncan hyperbola, while the soil is mainly shear contraction during testing. The interface frictional resistance and normal stress curve meets the Mohr-Coulomb criterion and the derived friction angle and frictional resistance of interface increase as surface roughness increases but is always lower than the internal friction angle and shear strength of soil respectively. When surface roughness is much larger than soil grain size, soil-structure interface is nearly shear surface in soil. In addition to the geometry of structural surface, the material types of structure also affects the performance of soil-structure interface. The wet interface frictional resistance will become lower than the natural one under specific conditions.
Key Words
    direct shear test; gravel sand; steel; sand rock; surface roughness; water content; friction angle; frictional resistance
Department of Civil Engineering, Tsinghua University, Beijing 100084, China.

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