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|Title:||SOIL STRUCTURE INTERACTION IN BURIED CONDUITS CONSIDERING TIME DEPENDENT BEHAVIOUR OF SOILS|
|Keywords:||CIVIL ENGINEERING;SOIL STRUCTURE INTERACTION;TIME DEPENDENT BEHAVIOUR;SOIL|
|Abstract:||The problem of Soil-Structure Interaction between a horizontally buried circular conduit and its surrounding soil (considering time dependant behaviour of soil) has'been studied, by using finite element method. The effect of time on soil behaviour has been evaluated by considering the soil as linearly visco-elastic. Its visco-elastic behaviour has been shown by kelvin model (a rheological model). The theological constants of the model were evaluated by conducting triaxial testing on stress control device in the laboratory. These constants were determined under two different stress conditions viz. hydro-static and deviatoric case. The conduits laid under trench condition with no slip condition have been analysed for plain strain condition with linear material properties.. The analyses have been carried out for gravity load with a line load acting along the longitudinal axis placed at the top of the embankment. The existing 2D linear elastic finite element analysis computer program was modified for corresponding visco-elastic analysis. The parameters included for the study are conduit diameter thickness ratio (L/V, trench width to conduit dia-met r (Bd/D) and the depth of conduit embedment to conduit diameter (H/D). All the cases have been analysed for constant bedding angle with same material properties. vi The variations of contact pressure distribution, horizontal and vertical pressure distribution, deformations and strain rates are plotted. The distribution of vertical contact pressure at top and bottom of the conduit is found to be non-uniform as against uniform pressure distribution assumed by spangler. Lastly, the loads obtained by finite element solution are compared with those obtained by Marston's load theory. It is found that loads, in general, computed by Marston's theory are under estimated except for higher trench widths.|
|Research Supervisor/ Guide:||Godbole, P. N.|
Viladkar, M. N.
|Appears in Collections:||MASTERS' DISSERTATIONS (Civil Engg)|
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