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http://dx.doi.org/10.9720/kseg.2020.1.059

Evaluation of Skin Friction Using Tensile Load Testing of CPR Piles  

Ko, Chin-Surk (Department of Energy and Resources Engineering, Chosun University)
Kim, Jung-Han (Hyowon E&C Co., Ltd.)
Noh, Jeongdu (Department of Energy and Resources Engineering, Chosun University)
Kang, Seong-Seung (Department of Energy and Resources Engineering, Chosun University)
Publication Information
The Journal of Engineering Geology / v.30, no.1, 2020 , pp. 59-69 More about this Journal
Abstract
Pull-out load tests were performed on a CPR (Compaction grouting compound Pile with Reinforce) test pile, with skin friction being evaluated by the yield load and allowable bearing capacity after analyzing load-displacement curves and load-settlement curves. Results of the CPR test piles analyzed from the load-displacement curves show that the yield load and allowable bearing capacity of the large-diameter CPR test pile were about 1.4 times larger than that of the small-diameter pile. Results of the load-settlement curves reveal that the allowable bearing capacity of the CPR test pile with diameter of D500 was 1.2~2.1 times greater than that of the pile with diameter of D400. However, the allowable bearing capacity calculated using Fuller's analysis differed substantially from that determined using the P (Pull-out load) - S (Settlement) and log P - log S curves. Therefore, calculation of the allowable bearing capacity using Fuller's analysis is shown to be inappropriate.
Keywords
CPR test pile; pull-out load test; yield load; allowable bearing capacity; skin friction;
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