Geomechanics and Engineering

  • 제11권1호
  • /
  • Pages.141-160
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  • 2016
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Comparative field tests on uplift behavior of straight-sided and belled shafts in loess under an arid environment

  • Qian, Zeng-zhen (School of Engineering and Technology, China University of Geosciences) ;
  • Lu, Xian-long (China Electric Power Research Institute) ;
  • Yang, Wen-zhi (China Electric Power Research Institute) ;
  • Cui, Qiang (China Electric Power Research Institute)
  • 투고 : 2015.04.24
  • 심사 : 2016.04.11
  • 발행 : 2016.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

This study elucidates the uplift behaviors of the straight-sided and belled shafts. The field uplift load tests were carried out on 18 straight-sided and 15 belled shafts at the three collapsible loess sites under an arid environment on the Loess Plateau in Northwest China. Both the site conditions and the load tests were documented comprehensively. In general, the uplift load-displacement curves of the straight-sided and belled shafts approximately exhibited an initial linear, a curvilinear transition, and a final linear region, but did not provide a well defined peak or asymptotic value of the load, and therefore their uplift resistances should be interpreted from the load test results using an appropriate criterion. Nine representative uplift resistance interpretation criteria were used to define the "interpreted failure load" for each of the load tests, and all of these interpreted uplift resistances were normalized by the failure threshold, $T_{L2}$, obtained using the $L_1-L_2$ method. These load test data were compared statistically and graphically. For the straight-sided and belled shafts, the normalized uplift load-displacement curves were respectively established by the plots that related the mean interpreted uplift resistance ratio against the mean displacement at the corresponding interpreted criteria, and the comparisons of the normalized load-displacement curves were made. Specific recommendations for the designs of uplift belled and straight-sided shafts in the loess were given, in terms of both capacity and displacement.

키워드

과제정보

연구 과제 주관 기관 : State Grid Corporation of China

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피인용 문헌

  1. Closure to “Discussion of ‘Axial Uplift Behavior of Belled Piers in Sloping Ground’ by F. A. B. Danziger, C. Pereira Pinto, A. P. Ruffier, and M. P. Pacheco” vol.42, pp.2, 2018, https://doi.org/10.1520/GTJ20180048
  2. Comparative Field Tests on Straight-Sided and Belled Piers on Sloping Ground under Combined Uplift and Lateral Loads vol.145, pp.1, 2019, https://doi.org/10.1061/(ASCE)GT.1943-5606.0001991
  3. Compaction techniques and construction parameters of loess as filling material vol.15, pp.6, 2018, https://doi.org/10.12989/gae.2018.15.6.1143
  4. Prediction of Pullout Behavior of Belled Piles through Various Machine Learning Modelling Techniques vol.19, pp.17, 2016, https://doi.org/10.3390/s19173678
  5. Seismic Stability of Loess Tunnel with Rainfall Seepage vol.2020, pp.None, 2020, https://doi.org/10.1155/2020/8147950
  6. Comparative lateral load field tests on straight-sided and belled piers in sloped ground vol.173, pp.1, 2016, https://doi.org/10.1680/jgeen.18.00151
  7. Evaluation of side resistance for drilled shafts in rock sections vol.21, pp.6, 2016, https://doi.org/10.12989/gae.2020.21.6.503