人工水平冻结冻土帷幕强制解冻温度场数值分析

结合某车站北端头盾构到达人工水平冻结加固工程，运用数值计算软件ADINA建立了人工强制解冻模型，研究了水平冻土帷幕在人工强制解冻条件下温度场的分布规律，分别对强制解冻过程中热水循环温度、热水循环时间，以及解冻管间距的敏感性进行了分析。结果表明：提高循环热水温度、延长热水循环时间以及尽量利用原有水平冻结管的最短间距均能够缩短冻土帷幕人工强制解冻的完成时间，进而提出了盾构到达水平冻结冻土帷幕人工强制解冻施工技术参数指标。

Thermal field numerical analysis of artificial thawing of horizontal freezing soil wall

Combined with the artificial horizontal soil freezing reinforcement construction for the arriving of shield machine in the northern end of the Metro station distribution law of horizontal soil wall thermal field was studied in artificial thawing condition.In this process ADINA finite element calculation software was applied to establish the artificial thawing model.Sensitivity of temperature of hot brine,circulation time of hot brine and distance between thawing pipes was analyzed.Calculation results indicated that raising temperature of brine,prolonging circulation time of brine and utilizing the shortest distance between thawing pipes could shorten the artificial thawing time of freezing wall.Furthermore,construction technical parameter and criteria of artificial thawing in arriving of shield machine horizontal freezing was proposed.