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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 43239 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Pak, Ali
- Abstract:
- Dynamic compaction (DC), as a method of deep improvement of soft soils, recently has been used increasingly worldwide. The method involves application of high energy by dropping heavy tamper on surface of the soil. The majority of previous studies on DC are concentrated on dry soils. Observations show that DC treatment in saturated soils is also effective, but little studies in this area are available. A fully coupled dynamic finite element code, PISA, has been used in order to clarify the ambiguities in process and to predict the strain/displacement filed in the ground, determine depth and degree of improvement, and also calculate the pore pressure variation during the process. Because the geometry and loading configuration are symmetric around the falling tamper (load centerline), a two-dimensional axisymmetric simulation has been used. Here for sake of simplicity, initial velocity of tamper nodes that can be determined from free fall equation has been used as input of program (Rigid Body Method). Granular soil densification behaviour due to body wave propagation is modelled using cap model of models introduced by Dimaggio and Sandler (1971). After verification of the results by comparing the numerical results with those measured in a real field case of saturated DC treatment in a highway, some sensitivity analyses have been performed to assess the effects of soil permeability, degree of saturation, applied impact energy, momentum, and tamper radius, on the degree and depth of ground improvement
- Keywords:
- Dynamic Compaction ; Saturated Soil ; Numerical Analysis ; Pore Water Pressure
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