深冷冻结工况下冻土帷幕平均温度预测模型适用性研究  

Applicability study of average temperature prediction models for frozen curtains ultra-low temperature freezing conditions

作　　者：李闻勃 高伟[1,2] LI Wenbo;GAO Wei(China Coal Research Institute,Beijing 100013,China;Beijing China Coal Mine Engineering Com pany Limited,Beijing 100013,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]北京中煤矿山工程有限公司,北京100013

出　　处：《建井技术》2025年第2期60-65,共6页Mine Construction Technology

基　　金：天地科技股份有限公司科技创新创业资金专项面上项目(2023-TD-MS001)。

摘　　要：人工地层冻结技术中,冻结帷幕平均温度是评估冻结效果与结构安全的核心参数。针对现有理论模型在-50℃深冷冻结工况下的适用性,通过模型试验与理论分析,对比了特鲁巴克模型、巴霍尔金模型、成冰公式及等效截面法等典型算法的预测精度。结果表明:成冰公式在常规及深冷工况下预测误差普遍低于8%,但冷媒流量低于3 m^(3)/h时因热传导机制改变导致精度显著下降;巴霍尔金理论衍生模型(等效梯形法、等效三角形法等)因忽略相变潜热的时变效应,计算值较实测值系统偏低约25%。研究揭示了传统模型在深冷冻结中的适用性,研究成果为深冷冻结工程设计提供理论依据。Artificial ground freezing(AGF)technology relies on the average temperature of the freezing curtain as a critical parameter for evaluating freezing effectiveness and structural safety.To assess the applicability of existing theoretical models under ultra-low temperature(-5o C)freezing conditions,this study conducted model tests and theoretical analyses to compare the prediction accuracy of classical algorithms including the Trubaczov model,Bakholdin model,“Chengbing”formula,and equivalent cross-section method.Results demonstrate that the“Chengbing”formula maintains prediction errors below 8%under both conventional and ultra-low temperature conditions.However,its accuracy significantly deteriorates when refrigerant flow rates drop below 3 m^(3)/h due to altered heat transfer mechanisms.Meanwhile,Bakholdin-derived models(e.g.,equivalent trapezoidal and triangular methods)systematically underestimate temperatures by approximately 25%compared to measured values,as they neglect the time-varying effects of latent heat during phase transitions.This research clarifies the applicability limitations of traditional models in ultra-low temperature freezing scenarios,providing theoretical foundations for optimizing engineering design in ultra-low temperature freezing projects.

关 键 词：人工地层冻结 冻土帷幕平均温度 深冷冻结 成冰公式 等效截面法 

分 类 号：TD265.3[矿业工程—矿井建设]