Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/4343
Title: BEHAVIOUR OF LATERALLY LOADED PILES' IN CLAY MEDIUM
Authors: Saran, Dayal
Keywords: CIVIL ENGINEERING;LATERALLY LOADED;PILES;CLAY MEDIUM
Issue Date: 1965
Abstract: Pile supported retainting walls, abutments or lock structures frequently resists high lateral forces. - These lateral forces may. be caused by earth pressures acting on retaining walls or rigid frame bridges, by differential fluid, pressures acting on lock structures or by horizontal thrust load acting on abutments of fixed or hinged arch bridge. The safety of these structures depends on the ability of the supporting piles to resist the resulting lateral forces. An experimental investigation was performed on 9 mm outer diameter and 5.9 mm inner diameter aluminium model piles. A 25.4 cm. long , 15:2 cm wide, and 30.5 cm. high wooden tank was filled with clay, in which pile groups were embeded. Wooden tank filled with clay was placed in a mobil oil tank for three days. This prevented evaporation of moisture from the surface soil. The pile groups were tested after allowing thixotropic hardening of the soil for 14 hours. Groups of 4-piles and 9-piles were tested with respect to spacing of piles in the laboratory. The centre to centre distance betiween the piles was kept 3D, 4D, and 5D, where D is the diameter of the piles A single free headed pile was tested with each group for comparison. A sustained lateral loads appears to have a very little effect on pile embeded in sand and stiff clay. Soft -2— soil deposits exhbit a tendency for consolidation and creep, when piles in these deposits are subjected to sustained load. Loading time was determined by applying constant sustained loads on the free headed single pile for a period of 3 hours. It was observed that the rate of increase of deflection decreases after two hours and this was taken as the loading time. The study was made in two parts : (1) Study of groups under measured rotation of the pile cap and (2) Study of pile groups under controlled rotation (zero rotation) of the pile cap. Pile groups include only vertical piles. The loads were applied horizontally in all cases at the ground level. No other loads were present. The horizontal displacement was measured at ground level by means of dial gauges. Two dial gauges fixed at a known distance apart on the top of the pile cap were used for measuring the rotation of the pile cap. In zero rotation tests, a sensitive bubble was mounted on the pile cap to ensure that the rotation is zero. The study indicates the following behaviour of pile groups with resptct to the spacing of piles; (a) L. good reproducibility of tests can be obtained by following the procedure adopted in the
URI: http://hdl.handle.net/123456789/4343
Other Identifiers: M.Tech
Research Supervisor/ Guide: Prakash, S.
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' THESES (Civil Engg)

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