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Submerged static load test of pile foundation in collapsible loess area(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2011年05期
Page:
63-67
Research Field:
Publishing date:
2011-10-20

Info

Title:
Submerged static load test of pile foundation in collapsible loess area
Author(s):
WEI Jin1;  LI Zhe1;  HAO Mang-li2;  ZHANG Zhi-fa1
1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Xi'an Municipal Construction Group Company, Xi'an 710054, Shaanxi, China
Keywords:
geotechnical engineering;  self weight collapse loess;  filling pile;  immersion static load test;  bearing behaviors of pile;  negative frictional resistance
PACS:
TU473.1
DOI:
-
Abstract:
The large scale field tests of filling piles were performed in a collapsible loess site(In the tests, the diameter and length of test piles are 0.8 m and 18 m respectively, the side length of immersion pit is 20 m). The tests were performed under natural content and immersion state, of which the results were compared and analyzed. The results show that the influence depth of immersion is limited in the range from the surface to 8.5 m beneath the surface. The form of side friction curve is “single peak”, the distribution of negative friction is 3～9 m from the top of the pile, the strength is -0.5～-2.2 kPa, the results are obviously smaller than the ones in the saturate condition. The difference of pile bearing capacity in the nature and immersion state is small, the bearing capacity in the nature state is 1.06 times of which in the immersion states, but the difference of the deformation is apparently, the deformation(at the maximum load )in the immersion state is 7.76 times of which in the nature state. So the deformation control method should be used in the corresponding conditions. 1 tab, 8 figs, 11 refs.

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Last Update: 2011-10-20