加芯水泥土搅拌桩竖向承载特性及单桩极限承载力预测
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TU473

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SBISP-易扰动土界面摩擦特性及其力学响应研究


Research and Prediction on Vertical Bearing Behavior of Concrete-cored DCM Pile
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Study on SBISP-Fragile Soil Interface Friction Characteristics and Its Mechanical Response

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    摘要:

    加芯水泥土搅拌桩具有承载力高、造价低、施工便捷等特点。为其工程设计、施工及检测提供有效的科学理论依据,推进其发展应用,利用现场载荷试验、MIDAS数值模拟研究其单桩竖向承载特性,讨论了不同芯长比、含芯率、弹性模量内芯桩对其竖向承载特性的影响,并基于Weibull模型对其极限承载力进行了预测。结果表明:①承载力随芯长比增大而增大最后趋稳定,综合分析得最佳芯长比约为 0.722;②总体上含芯率越大其承载力越大最终趋稳定,综合分析得最佳含芯率约 0.204;③内芯桩弹性模量对其承载力影响很小,即内芯桩采用 C15或 C20混凝土就能满足要求;④基于Weibull模型预测加芯水泥土搅拌桩极限承载力整体效果较好,证明了其科学性和高效性,能够给工程实际提供有效参考。

    Abstract:

    Concrete-cored DCM pile has the characteristics of high bearing capacity, low cost and convenient construction. To Provide effective scientific theoretical basis for engineering design, construction and testing of Concrete-cored DCM pile, and promote its development and application, the field load tests and MIDAS numerical simulation were used to study the vertical bearing behavior of its single-pile. The effects of core length ratio, core ratio, and core piles with different elastic moduli on their vertical bearing behavior were discussed, and the ultimate bearing capacity of Concrete-cored DCM pile was predicted based on the Weibull model. The results showed that: (1)the bearing capacity increases with the growth of the core length ratio and finally reaches stability. Comprehensive analysis shows that the optimal core length ratio is about 0.722; (2)in general, the larger the core content is, the higher its bearing capacity is and it tend to a stable value. Fully considered results illustrated that the optimal core content is about 0.204; (3)the elastic modulus of the inner core pile has little influence on its bearing capacity, that is to say, the inner core pile can meet the requirements with C15 or C20 concrete; (4)based on Weibull model, the whole effect of predicting the ultimate bearing capacity of Concrete-cored DCM pile is better, which proves its scientificity and correctness, and can provide some reference for the engineering practice.

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刘维,徐光黎,彭文喜,等. 加芯水泥土搅拌桩竖向承载特性及单桩极限承载力预测[J]. 科学技术与工程, 2020, 20(19): 7838-7844.
Liu Wei, Xu Guangli, Peng Wenxi, et al. Research and Prediction on Vertical Bearing Behavior of Concrete-cored DCM Pile[J]. Science Technology and Engineering,2020,20(19):7838-7844.

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  • 收稿日期:2020-01-14
  • 最后修改日期:2020-03-23
  • 录用日期:2020-02-21
  • 在线发布日期: 2020-07-28
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