Abstract
Based on an important construction in Qingdao, China, the static compression load tests were carried out on three instrumented piles so as to discuss the bearing capacity of bored socked piles installing double-sleeve as well as the effects of post-grouting technology on piles. The results show that the load-sedimentation curves of testing piles were slow type, without obvious fluctuations. The head displacement varied from 13 mm to 19 mm, with higher resilience from 48% to 52%. Double-sleeve technology effectively isolated incomplete consolidation soil to avoid the effects of negative friction on piles. The location of peak side friction along the shaft moved down along with increasing applied load. More than 70% of the total head load supported and transmitted by base resistance at the end of tests due to the shorter effective pile length. The base enhancement coefficient of post-grouting at medium weathered soft rock varied from 3.38 to 3.7, greater than recommendations of Chinese technical code (JGJ94-2008) on strong weathered rock.
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