论文部分内容阅读
在全球大气升温、气候变暖以及人为因素干扰的情况下,冻土上限的变化对多年冻土地区的工程基础会有不同程度的影响,使其承载能力会发生一定程度的改变。本文选取活载为中-活载和ZKH活载模式,结合青藏铁路桥梁桩基承载性能问题,进行了基桩的数值模拟分析。通过在冻土上限变化条件下基桩的内力和变位的对比,评价桩基在冻土上限变化时2种模式的活载作用下桥梁桩基各性能指标的安全储备。为多年冻土桥梁的桩基础设计与施工提供一定参考。
Under the global warming of the atmosphere, the warming of the climate and the interference of human factors, the change of the upper limit of the permafrost will affect the engineering foundation of the permafrost to varying degrees, and the bearing capacity of the permafrost will change to some extent. In this paper, the live load is selected as the medium-live load and the ZKH live load mode. Based on the bearing capacity of the pile foundation of the Qinghai-Tibet Railway Bridge, the numerical simulation of the pile is carried out. By comparing the internal forces and displacements of the foundation piles under the variation of the upper limit of the permafrost, the safety reserves of the various performance indexes of the piles under the two modes of live load are evaluated. It provides some references for the design and construction of pile foundation of permafrost bridges.