深埋纯地下建筑不同抗拔桩型承载性状试验研究  

Experimental study on behavior of different uplift piles for deep-embedded underground structure

作　　者：吴春秋[1] 肖大平[1] 吴俊[2] 

机构地区：[1]中国建筑科学研究院地基基础研究所,北京100013 [2]北京送变电公司,北京102401

出　　处：《岩土工程学报》2007年第9期1392-1397,共6页Chinese Journal of Geotechnical Engineering

摘　　要：通过对某沿海城市500 kV深埋地下变电站不同抗拔桩型的现场试验研究,对扩底抗拔桩和桩侧压浆等截面抗拔桩两种不同抗拔桩型的承载力性状进行了分析,研究了两种不同桩型的荷载传递规律和承载力提高机理。本文认为,对于含砂丰富地层且单桩承载力要求较高的长桩,宜优先选用压浆桩,而且在技术经济条件相当的情况下,选择桩侧压浆方案可以节省工期;对于以软土或黏土为主的地层或桩长较短的情况,扩底桩则比压浆桩更具优势。Based on the field test results of uplift bored piles for a deep-embedded 500 kV underground transformer substation in a coastal city, the uplift behavior of under-reamed bored piles and bored piles with pileshaft post-grouting was studied. The load transfer characteristics and mechanism of uplift capacity improvement for the two different types of uplift piles were investigated. Generally, for long piles in sandy soils, the uplift piles with pileshaft post-grouting were the first option, and the construction period would be shortened. However, for short piles in clayey soils, the under-reamed uplift piles could be more economic in terms of the equivalent pile size and capacity requirements.

关 键 词：抗拔桩 扩底桩 桩侧压浆 现场试验 对比分析 

分 类 号：TU473[建筑科学—结构工程]