青藏铁路多年冻土区路堤人为上限与融化夹层的数值模拟分析

Numerical simulation analyses of artificial upper table and residual thawed layer for embankment of Qinghai-Tibet Railway in the permafrost region

摘要: 初始温度场采用实测温度场,相应的物理参数通过实测地温数据用有限元方法反演得到,计算结果的可靠性由实测数据验证。用这种方法对3种结构形式4个实测断面的青藏铁路多年冻土区清水河试验段路堤的人为上限和融化夹层进行了数值模拟分析。计算结果表明,从人为上限形态及融化夹层范围和面积两方面来看,相同路堤高度情况下,片石通风—碎石护坡组合路堤优于片石通风路堤,而片石通风路堤优于普通路堤;对于同类型的路堤,高路堤优于低路堤。这种不同路堤结构形式的优劣性排序,可为多年冻土区路堤设计提供理论依据和技术支持。

Abstract: An actual temperature field is regard as the initial temperature field.The corresponding physical parameters are obtained through inversion of the finite element method with measured temperature data.The reliability of calculation results can be confirmed by measured data.This method is used to numerically simulate and analyze the artificial upper tables and residual thawed layers of four actual cross sections of the embankments with three kinds of structural styles in the Qingshuihe test segmen...