(1 北京市建筑工程研究院，北京100039；2 北京浩洋慧桥科技有限公司，北京100088；3 北京中阔地基基础技术有限公司，北京100097；4 黄委会勘测规划设计研究院，郑州450003)

［摘要］通过现场静载荷试验，在膨胀土地基中，对桩身穿越大气影响深度并以硬塑黏土为承力盘和桩端持力层的单节DX挤扩灌注桩，及以硬塑黏土为上承力盘持力层和以硬塑~坚硬黏土为下承力盘和桩端持力层的两节DX挤扩灌注桩的极限承载力进行判定，分析其荷载传递机理，并对其侧阻力、盘端阻力和桩端阻力的分配及发展规律进行研究。该两种桩型在极限状态下均显示出以总侧阻力为主的特性，属于端承摩擦桩。

［关键词］DX桩;承力盘;静载荷试验;极限承载力;侧阻力;盘端阻力;膨胀土;黏土

中图分类号：TU473.1文献标识码：A文章编号：1002-848X(2011)02-0106-07

Test study on load transfer mechanism of DX piles for certain thermo-electric plant

Shen Baohan1, Wang Yan2, Liu Zhenliang3, He Dexin3, Geng Yuping4

(1 Beijing Building Construction Research Institute, Beijing 100039, China; 2 Beijing Smart Bridge Tech. Inc.，

Beijing 100088, China; 3 Beijing Zhongkuo Foundation Co., Ltd., Beijing 100097, China; 4 HRWCC Institute of

Geotechnical Investigation ＆ Surveying, Zhengzhou 450003, China)

Abstract:Static loading tests for DX piles with single bulb and double bulbs which installed in clay were conducted in field. Its ultimate bearing capacities were determined, and its load transfer mechanism was analyzed. The distribution and development of the skin-friction resistances, the bulb resistances and the point resistances of the DX piles were studied. Under ultimate conditions,both piles reflected characteristics which put skin friction resistances first are belong to point resistance-skin friction resistance piles.

Keywords:DX pile; bulb bearing; static loading test; ultimate bearing capacity; skin-friction resistance; bulb resistance; expansive soil; clay

作者简介：沈保汉，教授级高级工程师，Email：shenbaohan@163.com。

参考文献

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