| Mechanical & Civil Engineering |
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| A destructive field study on the behavior of piles under tension and compression |
| Zhong-miao Zhang, Qian-qing Zhang, Feng Yu |
| MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China, Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China, School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China |
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Abstract This paper involves a series of destructive full-scale load tests on long bored piles instrumented with strain gauges along the shafts, including two compression and two tension loading tests. The load-displacement response, axial force, skin friction, and the thresholds of the slip displacement for fully mobilizing the skin resistances in different soils are discussed. Moreover, the theoretical solution for estimating the pile tip settlement under compression was adopted to analyze the test results. It was found that the measured skin frictions for the piles under compression were about 6% to 42% higher than the estimated values of the cone penetration tests (CPTs), whereas the measured skin frictions in the uplift cases were about 16% to 50% smaller than the estimated values. In addition, the average limited skin frictions for the tension piles were about 0.36 to 0.78 times the average ultimate skin frictions for the piles under compression. It also can be indicated that the skin friction along the pile depth approached the limited state, and decreased from a peak value with increasing loads.
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Received: 31 May 2010
Published: 11 April 2011
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