大直径嵌岩桩单桩承载性能的有限元分析

分析了嵌岩桩承载力的组成,考虑到桩身与周围土体之间存在着滑移的可能性,对其设置接触单元,利用三维有限元软件进行了桩侧阻力、桩端阻力及嵌岩深度的分析计算。讨论了嵌岩桩承载力与长径比、桩径、嵌岩深度及基岩强度的关系,提出了长径比和桩径都是影响嵌岩桩承载力的重要因素,过大的长径比对其承载力的提高并不明显以及存在着合理桩径;验证了嵌岩桩确实存在着最佳嵌岩深度,但不一定存在着最大嵌岩深度,并且最佳嵌岩深度随着基岩强度的减弱而增大。

Finite Element Analysis of Load-bearing Properties of Large Diameter Rock-socketed Single Pile

Constitution of rock-socketed piles' load-bearing properties was analyzed;based on the possibility of slippage between the pile and surrounding soil,the pile side resistance,tip resistance and embedded rock depth were calculated through three-dimensional finite element software.The relationship between the load-bearing capacities and aspect ratio,pile diameters,rock-socketed depth and bedrock was discussed.The research result indicated that the aspect ratio and pile diameters played an important role in influencing bearing capacity;excessive aspect ratio exerted little influence on bearing capacity;the existence of the optimal depth embedded in the rock-socketed piles was verified,however,it was not certain whether there was the maximum depth of embedded rock or not;the weaker the rock strength,the deeper the optimal socketed rock.