Abstract Temperature is a key factor that affects the adfreeze strength between frozen soil and a structure. Under the influence of climate change, permafrost degradation reduces the bearing capacity of bored piles in permafrost regions. Based on the monitoring results of bored piles at a site in Beiluhe and related simulations, the effect of a ventilated open structure (VOS) on the temperature at the pile-soil interface and the bearing capacity of bored piles was discussed. The results showed that climate warming can significantly reduce the bearing capacity of bored piles. The higher thermal conductivity of concrete than frozen soil had a negligible influence on thermal stability of pile. However, the temperature at the pile-soil interface decrease drastically within a year due to the lower surface boundary temperature beneath a VOS. Numerical simulation indicated that the bearing capacity of bored piles with a VOS increases during the first 25 years and then decreased. While the bearing capacity without a VOS decreases over 50 years. A VOS can improve the stability of bored piles, delay bearing capacity degradation of bored piles for at least 50 years, and significantly reduce the design pile length.

中文翻译：

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青藏高原多年冻土区通风开孔结构对钻孔桩稳定性的影响

摘要 温度是影响冻土与结构间抗冻强度的关键因素。在气候变化的影响下，多年冻土退化降低了多年冻土地区钻孔桩的承载力。基于北麓河某场地钻孔桩监测结果及相关模拟，探讨了通风开放结构（VOS）对桩土界面温度和钻孔桩承载力的影响。结果表明，气候变暖会显着降低钻孔桩的承载力。混凝土比冻土具有更高的热导率，对桩的热稳定性的影响可以忽略不计。然而，由于 VOS 下方的表面边界温度较低，桩土界面的温度在一年内急剧下降。数值模拟表明，具有 VOS 的钻孔桩的承载力在前 25 年中增加，然后下降。而没有 VOS 的承载能力会在 50 年内下降。VOS可以提高钻孔桩的稳定性，延缓钻孔桩承载力退化至少50年，并显着减少设计桩长。