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中南大学学报(自然科学版)

Journal of Central South University

第43卷    第5期    总第213期    2012年5月

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文章编号:1672-7207(2012)05-1920-06
夯实水泥土楔形桩复合地基工作性状试验研究
何杰1, 2,张可能1,刘杰2,吴有平2,李冰2

(1. 中南大学 地球科学与信息物理学院,湖南 长沙,410083;
2. 湖南工业大学 土木工程学院,湖南 株洲,412007
)

摘 要: 针对软土地基中的夯实水泥土桩复合地基,分别进行1组圆柱形桩和3组不同楔角楔形桩的9桩复合地基对比试验,研究这4组复合地基在相同条件下的桩-土平均沉降差、桩体应力、平均桩-土应力比、平均沉降随荷载变化的规律。研究结果表明:夯实水泥土楔形桩能有效地调节桩-土沉降差和地基沉降,提高地基承载力;增大楔形桩的楔角能使桩体较早地发挥其承载性能;在一定荷载范围内,夯实水泥土楔形桩复合地基的平均    桩-土应力比夯实水泥土圆柱形桩复合地基的平均桩-土应力比大;随着荷载的增加,桩体所分担的荷载是有限的,夯实水泥土楔形桩复合地基的平均桩-土应力增长趋于稳定或下降,即楔形桩的倾斜侧壁能有效地缓解桩体应力集中现象。

 

关键字: 楔形桩;夯实水泥土桩复合地基;桩-土沉降差;桩体应力;桩-土应力比

Experimental research on bearing behavior of composite foundation with rammed soil-cement tapered piles
HE Jie1, 2, ZHANG Ke-neng1, LIU Jie2, WU You-ping2, LI Bing2

1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
2. School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China

Abstract:Aimed at composite foundation with rammed cement-soil piles in soft ground, the contrast tests on a group of composite foundation with nine rammed cylindrical cement-soil piles and three groups of composite foundation with nine rammed tapered cement-soil piles were performed in laboratory, respectively. The average settlement difference among pile and soil, pile stress, average pile-soil stress ratio and the relationship between load and average settlement of four groups of composite foundation with rammed cement-soil piles were respectively studied under the same condition. The results indicate that the differential settlement between pile and soil can be adjusted by rammed tapered cement-soil pile, the ground settlement decreases and its bearing capacity is enhanced obviously. The bearing behavior of rammed tapered cement-soil piles in the composite foundation can be exerted by enhancing its taper. Within some load scopes, the average pile-soil stress ratio of composite foundation with rammed tapered cement-soil piles is higher than that of composite foundation with rammed cylindrical cement-soil piles. With the increase of load unceasingly, the load shared by tapered piles increases restrictedly, and the average pile-soil stress ratio of composite foundation with rammed cement-soil tapered piles is near a certain value or falls down, i.e. the slope skin of tapered pile can effectively alleviate the stress concentration of pile.

 

Key words: tapered pile; composite foundation with rammed cement-soil piles; differential settlement between pile and soil; pile stress; pile-soil stress ratio

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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