粉土中刚性长短桩复合地基承载力发挥度参数影响研究

通过有限元分析,研究了相同承台板沉降下短桩桩长、桩径、桩间距、褥垫层厚度变化对长短桩复合地基中桩与土承载力发挥度的影响.研究表明:相同承台板沉降下,增加桩长、桩径、桩间距,减小褥垫层厚度会提升长短桩复合地基承载力.短桩桩长变化对长、短单桩承载力发挥度的影响较小.增加桩径和褥垫层厚度,会提高单桩承载力发挥度.随桩间距增大,长桩单桩承载力发挥度增加,短桩单桩承载力发挥度减小.短桩桩长、桩间距、褥垫层厚度增大,桩间土承载力发挥度增加;增加桩径,桩间土承载力发挥度减小.

Parameters Influence on Bearing Mobilization Coefficient of Rigid Long-Short-Pile Composite Foundation in Silt

Through finite analysis software, the influences of pile length, pile diameter, pile distance and cushion thickness on the bearing mobilization coefficient （BMC） of single short pile, long pile and soil between piles are analyzed under the same raft settlement. The results indicate that the bearing capacity of foundation increases with the increases of short pile length, pile diameter, pile distance, while decreases with the increase of cushion thickness. The BMC of short and long pile change little with the increase of short pile length. With the increases of pile diameter and cushion thickness, the BMC of single pile increases. With the increase of pile distance, the BMC of long pile increases while short pile decreases. The BMC of soil between piles increases with the increase of short pile length, pile distance and cushion thickness while decreases with the increase of pile diameter.