地下水对人工地层冻结过程的影响机制研究进展及展望

Research Progress and Prospect on Influencing Mechanism of Groundwater to Artificial Formation Freezing Process

目前关于地下水渗流作用对人工地层冻结过程的影响机理研究主要集中在模型试验、数值计算以及理论解析解3个方面。关于模型试验的研究成果已经基本实现了地下水对人工冻结温度场影响规律的定性分析,但对于地下水流速度对冻结温度场的量化影响规律尚未得出一致的研究结论;关于地下水渗流条件下人工冻结温度场的数值计算方法主要包括“表观热熔法”以及“焓-孔隙度法”,但这两种数值计算模型均对水热耦合过程进行了简化,无法全面深入地反映较大流速地下水与冻结温度场耦合作用的科学本质,因此流速计算范围受到一定的限制,计算准确度也有待提高;关于地下水作用下冻结温度场解析解的研究成果主要集中在稳态温度场方面,能够反映温度场随时间及流速变化规律的瞬态温度场理论解尚无相关成果。基于当前的研究现状,提出了该科学问题未来的研究方向。

The research on the influence mechanism of groundwater on the artificial formation freezing process mainly focused on 3 aspects:model test,numerical calculation and theoretical analytical solution.The research results of the model test have basically realized the qualitative analysis of the influence law of groundwater on the artificial freezing temperature field.However,no consistent conclusions have been drawn about the quantitative influence of groundwater velocity on freezing temperature field.The numerical calculation methods of artificial freezing temperature field under groundwater seepage condition mainly include"apparent-heat capacity method"and"enthalpy porosity method".However,both of these two numerical calculation models simplified the hydrothermal coupling process and could not fully and deeply reflect the scientific nature of the coupling between the large flow rate groundwater and the freezing temperature field.Therefore,the range of velocity calculation was limited and the accuracy of calculation needed to be improved.The research results on the analytical solution of freezing temperature field under the action of groundwater mainly focused on the steady-state temperature field.The theoretical solution of transient temperature field which can reflect the law of temperature field changing with time and flow velocity has not been relevant.Based on the current research status,the future research direction of this scientific problem was put forward.