人工冻土解冻温度场数值分析

以某车站盾构到达人工水平冻结加固工程为背景,利用大型有限元软件建立自然解冻数值模型进行模拟分析,并将现场监测数据与数值模拟结果进行对比分析。研究表明:水平冻土帷幕在停止冻结后60 d可以完成自然解冻过程;冻土的自然解冻速率随解冻时间的延长而减慢;影响盾构达到人工水平冻土帷幕自然解冻的主要因素为隧道空气散热及未冻土的热传导。

Numerical analysis on the artificial freezing soil thawing temperature field

Taking a station shielding reaching artificial horizontal freezing reinforcement engineering as the background,the paper establishes the natural thawing numerical model and carries out simulation analysis by using large-scale finite element software,and compares the site monitoring data with numerical simulation results.The research shows that: horizontal freezing soil curtain can be naturally unfreezed after 60 days of freezing failure,the natural thawing ratio of the freezing soil will slow down with the thawing time prolong,the major factor influencing the shielding reaching the artificial horizontal freezing soil curtain to the natural thawing is the tunnel air heat dissipation and unfreezing soil heat transfer.