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在工程建设项目实施过程中,由于多年冻土地表覆盖条件被建(构)筑物破坏,改变了土体的热平衡状态,多年冻土退化,冻土上限将下移,季节融化层的融沉固结使桩基负摩擦力增大,因此,研究冻土融化后负摩阻力对桩基承载力的影响更具有工程实用价值。该文通过室内试验,研究土体在融化过程中融沉量的变化,土体融沉量与温度之间的关系,获得季节融化层负摩阻力与含水量之间的关系,为指导冻土地区桩基础设计和施工提供有力的技术支持和理论依据。
During the implementation of the project, due to destruction of the building (structure) destroyed by the cover condition of the permafrost, the thermal equilibrium of the soil is changed, the permafrost is degraded, the upper limit of the permafrost will be moved downward, and the thaw of the seasonal melting layer will be reduced. Consolidation increases the negative friction force of the pile foundation. Therefore, it is more practical and practical to study the influence of negative friction resistance on the bearing capacity of the pile foundation after the frozen soil is melted. In this paper, the indoor experiment is used to study the change of soil sinking capacity during the melting process, the relationship between soil subsidence and temperature, and the relationship between negative friction resistance and water content of seasonal melting layer. The regional pile foundation design and construction provide strong technical support and theoretical basis.