Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (9): 3610-3617.doi: 10.16285/j.rsm.2017.2384

• Geotechnical Engineering • Previous Articles     Next Articles

Field test and calculation method of negative skin friction of rock-socketed piles

WU Shuang-shuang1, HU Xin-li1, ZHANG Han1, ZHOU Chang1, GONG Hui2   

  1. 1. Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, China; 2. Guizhou Bridge Construction Group Co., Ltd., Guiyang, Guizhou 550001, China
  • Received:2017-11-29 Online:2019-09-10 Published:2019-09-08
  • Supported by:
    This work was supported by the Key National Natural Science Foundation of China (41630643) and the Key National R & D Program of China(973 Program)(2017YFC1501302).

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Abstract: The pile-soil shear displacement has a significant influence on the development of negative skin friction of piles. Based on current research, a calculation method of plie-soil shear displacement was established by the monitoring results of the pile strain and the soil settlement in the field test. This method was used to analyze the monitoring data of pile and soil in the shallow middle layer, and then the shear displacement of pile and soil was determined to be 4?5 mm under the condition of free pile top in the test. However, the negative skin friction was unavailable to reach its extreme value when the shear displacement of deep pile and soil did not reach the above value. In addition, according to the development characteristics of negative skin friction, its calculation in the specifications was improved by considering both the vertical effective stress of soil around piles and the pile-soil shear displacement. The negative skin friction calculated by this improved method has a good correspondence with the test results. The obtained dragload can achieve a safe, economical effect, which can offer references for engineering design.

Key words: pile-soil shear displacement, negative skin friction, rock-socketed pile, effective stress method, dragload

CLC Number: 

  • TU 473
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