摘要
砂土及风化砂岩地基中钻孔灌注桩抗拔承载力的时效性研究至今尚无明确的研究成果,此方面的研究具有重要的意义。结合现场抗拔试验数据和灌注桩的施工工艺,对时效性机制进行了分析。结果显示,由于泥浆护壁所形成的过厚泥皮的影响,砂土及风化砂岩地基中钻孔灌注桩抗拔承载力的时效性十分明显,甚至比在黏性土地基中还要强,在前期承载力的增长较快,后期较慢。为了充分利用该类桩的抗拔承载力,建议适当延长试桩前的休止期。
No explicit result has been achieved on the research of time-effect on uplift bearing capacity of drilled grouting pile in the ground of sandy soil and weathered sandrock. The mechanism of time-effect is analyzed by the data from the test and the construction draft of drilled grouting pile. It is shown that the time-effect of drilled grouting pile on sandy soil is significant under the effect of too thick lateral mud, even strong than cohesive soil. The uplift bearing capacity increases more quickly in the early period than that in the later. In order to make good use of the uplift pulling capacity, it is suggested that the resting phase before the pile test should be lengthened properly.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第11期3153-3156,共4页
Rock and Soil Mechanics
关键词
钻孔灌注桩
时间效应
风化岩
休止期
抗拔承载力
侧摩阻力
drilled grouting pile
time-effect
weathered rock
time of repose
uplift bearing capacity
lateral resistance
