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  Interface Shearing Characteristic between Biopolymer-treated Soil and Underground Structures

  Recently, there have been a lot of applications of environmentally friendly microbial biopolymer as a new construction material for geotechnical engineering practices including soil stabilisation, slope protection, and ground injection. Biopolymer is known to have excellent geotechnical properties improvement effect such as shear strength properties enhancement and hydraulic conductivity reduction through formation of direct ionic bond with soil particles, especially clayey soil particles. Meanwhile, the rheological (e.g. pseudoplasticity, shear-rate dependent thixotropy) of biopolymers render distinctive behaviours such as shear thinning and lubrication effect under high strain condition, while recovers its viscosity and shear stiffness when placed at rest. In this study, interface direct shear tests were carried out to verify the characteristics of interface shear behaviour between biopolymer improved ground and underground structures. The interface shear behaviour of biopolymer-treated soil was investigated according to biopolymer content and water content variation, as well as considering the surface roughness variation of the adjacent structural member.

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