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Deep cement mixing (DCM) is one of the most widely used methods for soft ground improvement. The DCM method injects cementitious material into soft ground and mixes the resultant mixture to effectively improve strength, stiffness and other geotechnical properties of the ground. However, seismic hazards caused by sea waves, tides, tsunamis, and earthquakes are not considered in the design stage of the DCM method. Unexpected seismic problems may cause small to large deformation of the cement-treated soil. Therefore, a resonant column (RC) test was performed to measure the strain-dependent dynamic properties of cement-treated Ulsan clay. The results show an increase in shear stiffness with time during hardening of cement-treated clay. Different trends of strain-dependent G/Gmax and damping are observed with curing time. Estimated dynamic properties of cement-treated clay provide meaningful information for seismic analyses.
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