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Time Effects on The Bearing Capacity of Driven (时间对承载力的影响).pdf

发布:2017-08-31约3.15万字共4页下载文档
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Time Effects on The Bearing Capacity of Driven Piles C.S. Chen, S.S. Liew Y.C. Tan SSP Geotechnics Sdn Bhd, Malaysia ABSTRACT: Two case histories where the changes in pile capacity were observed with time are presented. The first case shows the increase in pile capacity especially the shaft friction for piles driven into clayey deposit. The average unit shaft friction, determined from the high strain dynamic pile test, has increased from 33 kPa to 57 kPa from 3 days to 33 days after the installation of piles. The second case shows a tendency of increase in pile capacity for pile driven into sandy deposit over a period longer than needed for complete dissipation of excess pore water pressure induced by the driving process. 1 INTRODUCTION Beyond this transition zone, the soil remains its original properties. The driving of pile sets up high pore water pressure The geotechnical capacity of pile is normally estimated by static in the remolded zone. The water flows away from the pile pile formulas and later confirmed by pile load test. Very often surface and the remolded zone is re-consolidated. This re- the pile load test was carried out shortly after the installation of consolidation process can lead to higher undrained shear pile. The pile capacity obtained from the load test is often strength and give higher pile capacity. In some cases, the assumed to be the long term pile capacity. However, during the remolded zone which is of higher strength than the surrounding pile driving process, soils which surround the pile shaft and soil will adhere
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