›› 2017, Vol. 38 ›› Issue (8): 2227-2233.doi: 10.16285/j.rsm.2017.08.010

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Uplift tests and uplift resistance analysis of pipe segment in soft backfill clay

QIU Li1, CHAI Neng-bin2, ZHU Bin2, NI Wei-jie2, JIANG Jie1   

  1. 1. Southwest Company, China Petroleum Engineering Co., Ltd., Chengdu, Sichuan 610017, China; 2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China sorry
  • Received:2015-09-21 Online:2017-08-11 Published:2018-06-05
  • Supported by:

    This work was supported by the Science and Technology Program of China Petroleum Group Engineering Design Co. Ltd. “Research on Strain Based Design and Engineering Measures of Pipelines in Special Regions”(KY2011-19)。

Abstract: A set of test devices were developed, and a series of full-scale uplift tests were carried out on a pipe segment buried in lumpy soft clay backfill. Focusing on the influence of shear strength of soil, depth-diameter ratio and loading mode, the pile-soil interaction, the failure mode and the uplift resistance were studied. The test results show that the deformation properties of lumpy soft clay backfill are different from uniform soft clay during uplifting. For the former, deformation is due to the position shift of soft clay blocks and the outflow of water in gaps between the blocks. For the latter, it is due to consolidation. When the depth-diameter ratio is equal to 1, the failure mode of lumpy soft clay backfill is more closed to ‘local’ flow-round. It is much less than DNV’s suggestion which is 3. It was suitable to use Palmer’s approach to calculate the uplift resistance of lumpy soft clay under long-term load if 1. The uplift resistance of pipeline in lumpy soft clay increases as the increase of and it is mainly linear increase with the increase of the shear strength. The consolidation rate of lumpy soft clay is much larger than uniform soft clay, so it may be taken into account of the effect of strength restoration of clay to the uplift resistance during design.

Key words: soft clay backfill, pipe segment, full-scale uplift tests, failure mode, uplift resistance

CLC Number: 

  • TU 473.1

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