Post-grouting bored piles are widely used in soft soil engineering in Indonesia,but the theoretical research on the bearing characteristics of post-grouting bored piles still lags behind engineering practice.Based on a project in Indonesia's soft soil re-gion,field tests of bored piles with different pile lengths and post-grouting bored piles were carried out.The results show that the ulti-mate bearing capacity of post-grouting bored piles is 1.20 to 1.26 times that of bored piles,and the rebound rate and elastic deforma-tion of post-grouting bored piles are correspondingly increased.Under the geological conditions of the study area,the upward flow height of post-grouting cement slurry is 12.4～13.8 m,and the downward penetration depth of cement slurry below the pile tip is 1.3～2.1 m,which is 1.6～2.6 times the pile diameter.The blow counts of the standard penetration test(SPT)of the rock and soil layers below the cement slurry return height of the post-grouting pile and below the pile end are significantly increased compared to those before grout-ing.The improvement of the pile side friction resistance and pile end resistance caused by post-grouting is the main factor for improv-ing the bearing performance of the bored pile.The research results have reference significance for the design and construction of post-grouting in soft soil areas in Indonesia.
关键词
软土/钻孔灌注桩/后注浆/承载性能/静载试验
Key words
soft soil/cast-in-place bored pile/post-grouting/bearing performance/static loading test
维普
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