Effectiveness of Geocell in Improving the Dynamic Soil Properties for Machine Foundation
摘要
This study presents the effectiveness of geocell in improving the dynamic properties of soil subjected to machine loading. A hypothetical machine foundation of 1 m diameter M20 grade concrete was assumed on soil with dimensions (15 × 60 m). A series of analysis with varying frequencies with respective amplitudes were carried out in finite element software PLAXIS 2D. The displacement response of unreinforced soil was compared against geocell reinforced soil. Numerical analysis on soil subjected to machine foundation were conducted on the following cases: (i) unreinforced and geocell reinforced soils (ii) Geocell reinforced soil in presence of earthquake and (iii) geocell reinforced soil without earthquake. The dynamic properties studied in this study were the coefficient of uniform elastic compression, coefficient of uniform and non-uniform shear, Dynamic modulus, shear modulus and stiffness on the guidelines of IS 5249. Geocell increased the dynamic modulus of soil by 36% with host soil as infill. On the other hand, infill materials showed further increase noticeably. Peak particle velocity was also reduced with the change in infill material. Infill material with high strength properties showed higher reduction in displacement amplitude. There is a significant increase in displacement amplitudes in presence of earthquake. Surprisingly, geocell reduced the displacement amplitudes of foundation level in presence of earthquake. All the aforementioned cases were conducted for both homogeneous and layered soil. Layered soils exhibited displacements relatively less than homogeneous soils.