冻土层上限下移对桥梁桩基轴向承载性能的影响分析

在气候变暖和人类活动的共同作用下,多年冻土层上限逐渐下移.现依托青海某高速公路上的一座中桥,在不同冻土层上限位置方案下对其桩基轴向承载性能进行数值模拟,通过将模拟计算出的桩基轴向承载性能指标进行对比分析,得到多年冻土区桥梁桩基轴向承载性能指标随冻土层上限下移的变化规律.其成果可为多年冻土区桥梁桩基的设计、施工与加固处理提供一定参考.

Analysis on Influence of Upper Limit Downshift of Frozen Soil Layer on Axial Bearing Capacity of Bridge Pile Foundation

Under the combined action of climate warming and human activities, the upper limit of frozen soil layer is gradually moving down for many years. Based on a middle bridge on an expressway in Qinghai, the axial bearing capacities of its pile foundation are numerically simulated under the different upper limit position schemes of frozen soil layer. By comparing and analyzing the axial bearing capacity indexes of pile foundation calculated by simulation, the variation law of axial bearing capacity indexes of bridge pile foundation is obtained with the upper limit downshift of frozen soil layer. The achievements provide some reference for the design, construction and reinforcement of bridge pile foundation in frozen soil regions for many years.