摘要
嵌岩桩是在端承桩的基础上发展起来的,在计算嵌岩桩承载力时,过去常忽略覆盖层的侧阻力,将嵌岩桩作为直接传递荷载给基岩的受压柱看待,荷载全部由桩端承担。本文通过对嵌岩桩的长径比大小、上覆土层特性、嵌岩段的岩性及成桩工艺(有无沉渣)等分析,得到嵌岩桩不一定是端承桩的概念,从而改变了人们对嵌岩桩承载特性的认识。即认为嵌岩桩的长度越长,长径比越大,上覆土层越硬、嵌岩深径比越大、嵌入岩体越深,嵌岩桩的承载性状越表现为摩擦型桩,而离端承桩也越来越远。并对现行的几种嵌岩桩承载力的计算模式进行了分析。
rock-socketed piles are developed from the end bearing piles.In the past,the overburden lateral resistance is always ignored when calculating the bearing capacity of rock-socketed piles,and rock-socketed piles are considered as the compressed columns which directly pass the load to the bed rock.The load would be borne by the pile tip.The rate of the length and diameter,the characteristics of overburden soil,the features of the rock-socketed tip rock and the techniques for pile construction are analyzed.It is indicated that rock-socketed piles is not certainly the end bearing piles,which changes our knowledge about the bearing characteristics of rock-socketed piles.The piles could be considered as the friction piles if the pile length is long enough,the rate of the pile length and the diameter is large enough,the overburden soil is hard enough,the rate of the rock-socketed depth and the diameter is large enough and the rock-socketed depth is deep enough.The some existed calculating modes for the bearing capacity of rock-socketed piles are analyzed.
出处
《工程勘察》
CSCD
北大核心
2010年第12期22-26,共5页
Geotechnical Investigation & Surveying
关键词
嵌岩桩
承载特性
荷载传递机理
承载力计算模式
rock-socketed pile
characteristic of bearing capacity
mechanism of load transmission
calculating mode of bearing capacity
