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Panu Promputthangkoon

Telephone: 0114 222 5071

Room: E110A

email : cip05pp@sheffield.ac.uk

Research Project

Liquefaction of Sand-waste Tyre Mixtures

Liquefaction is a phenomenon in which soils progressively lose shear strength and stiffness because of earthquakes, vibration or rapid loading. It occurs in saturated soils in which the pore space is completely filled with water. During dynamic loading, the pore water pressure builds up, and causes the effective stress of the soil to become zero. The soil then behaves like a fluid. Soils most susceptible to liquefaction are sands.

Liquefaction causes damage by; flow failure, lateral spread, ground oscillation, loss of bearing strength, settlement, and increased lateral pressure on retaining walls.

The aim of this research is to investigate sustainable solutions for landfill materials in seismic zones. It is therefore proposed to investigate the liquefaction potential of recycled tyre chips mixed with sandy soils. The shear strength, deformation, liquefaction and cyclic strength characteristics of sand-waste tyre mixtures under simulated earthquake shaking will be investigated using cyclic triaxial test apparatus.

Schematic of Shear-wave Velocity Measurement by Bender Elements Test. (Blewett et al, 1999) Schematic Diagram of cyclic triaxial apparatus (Higuchi, 2001) Niigata Earthquake, Japan, 1964. Tilting of apartment buildings at Kawagishi-Cho, Niigata, produced by liquefaction of the soil. [Structural Engineering Slide Library, W. G. Godden]

Shear wave velocity (Vs) and small-strain shear modulus (Gmax) will also be measured using bender elements. The small-strain shear modulus (Gmax) will provide soil information used in the analysis of dynamic loading and liquefaction. The expected results will be used for sustainable design

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