桩端型式对嵌岩随钻跟管桩承载性能的影响

doi:10.13722/j.cnki.jrme.2021.0625

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摘要随钻跟管桩是一种新型的预钻成孔大直径PHC管桩，桩端可嵌入中微风化岩层形成嵌岩桩。为揭示桩端型式对嵌岩随钻跟管桩承载性能的影响，结合混凝土塑性损伤模型、接触面黏结模型和等效Hoek-Brown准则的Mohr-Coulomb模型，建立ABAQUS有限元数值分析模型，重点分析孔底形状、桩靴尺寸、混凝土封底等因素。结果表明：在无混凝土封底条件下，对于孔底形状为柱形锥尖槽，桩端阻力比可达50%以上，槽深(15～30 cm)影响有限，但对孔底形状为梯形锥尖槽，桩端承载力弱化明显，仅为柱形锥尖槽的61%；开口钢桩靴易引起基岩接触面的惭进式破坏，桩靴厚度由24 mm增加到40～130 mm，桩端阻力比由54%提高到60%～76%，但增大桩靴厚度会影响排土，合理的桩靴厚度应通过现场试验确定；对于带桩靴的嵌岩随钻跟管桩，封底混凝土是提高承载性能的有效措施，若封底混凝土下部存在渣土，将弱化PHC管桩的桩端承载性能；最后，提出提高嵌岩随钻跟管桩承载性能的改进措施。

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	唐孟雄1
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	胡贺松3
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关键词 ：桩基础, 嵌岩桩, 随钻跟管桩, 承载性能, 数值分析, 桩端型式

Abstract：The drilling with pre-stressed concrete pile cased(DPC) pile is a new type of pre-drilled large-diameter PHC pipe pile，and its pile toe can be embedded in the moderately weathered rock. In order to reveal the influence of pile toe type on the bearing capacity of rock-socketed DPC piles，an ABAQUS finite element numerical analysis model was established by combining concrete damage plasticity model，interface bonding model and Mohr Coulomb model of equivalent Hoek Brown criterion. The influence factors such as hole bottom shape，pile shoe size and plugging concrete at the pile toe were emphatically analyzed. Numerical results show that，under the condition of no plugging concrete at the pile toe，the toe resistance ratio can reach more than 50% for the cylindrical cone groove at the bottom of the pile hole，and the influence of groove depth(15–30 cm) is limited. However，for the trapezoidal cone groove at the bottom，the end bearing capacity is obviously weakened，which is only 61% of that of cylindrical cone groove. The open-ended steel pile shoe can lead to the progressive destruction of the bedrock; the toe resistance ratio increases from 54% to 60%–76% when the thickness of pile shoe increases from 24 mm to 40–130 mm. Considering that increasing the thickness of pile shoe will affect soil discharge，the reasonable thickness of pile shoe should be determined by field tests. For the rock-socketed DPC pile with pile shoe，plugging concrete at the pile toe is an effective measure to improve the bearing capacity. However，the end bearing capacity will be weaken when there is sediment in the lower part of the plugging concrete. Finally，the improvement measures for the construction technology of DPC pile were put forward.

Key words： pile foundation rock-socketed pile DPC pile bearing performance numerical analysis pile toe type

引用本文:

唐孟雄1，凌造1，2，3，刘春林3，4，胡贺松3，4. 桩端型式对嵌岩随钻跟管桩承载性能的影响[J]. 岩石力学与工程学报, 2022, 41(S1): 3053-3062.
TANG Mengxiong1，LING Zao1，2，3，LIU Chunlin3，4，HU Hesong3，4. Influence of pile toe type on bearing capacity of rock-socketed DPC piles. , 2022, 41(S1): 3053-3062.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0625 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/3053

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