冻土区病害桩基容许承载力的数值模拟分析

研究发现温度场的变化会对高原冻土区桩基承载力产生影响,针对某铁路桥梁桩基出现的承载力下降现象,考虑桩土所处的复杂温度条件,采用ANSYS有限元软件建立桩基温度场模型,分析冻土温度场变化对该桩基承载力的影响。结果表明:承压水、太阳辐射和气候变暖等因素的作用使桩土界面温度升高,导致桩基础容许承载力下降,温度场对冻土区桩基稳定性的影响不可忽视,桩基础施工应尽量减少热量带入到冻土地区中,减小对冻土的热扰动。

Numerical Simulation Analysis of Allowance Bearing Capacity of Defected Pile Foundation in Permafrost Region

Studies find that the temperature field changes may impact pile foundation bearing capacity in plateau permafrost regions. In view of the decrease of pile foundation bearing capacity and the complex soil temperature condition where piles are located,a model of pile temperature field is established with ANSYS finite element software to analyze the impact of the change of temperature field on pile bearing capacity. The results show that confined water, solar radiation and global warming may raise the temperature at pile-soil interfaces and reduce pile bearing capacity. The impact of temperature field on pile stability in permafrost region is not to be ignored. Calories into permafrost region shall be minimized during pipe foundation construction so as reduce thermal disturbance of the permafrost soil.