This paper presents a case study of deep excavation using the artificial ground freezing (AGF) method for tunnel restoration work in the Nakdong River deltaic deposits. The study involved detailed construction monitoring and data analysis to assess the thermal and mechanical impacts on surrounding ground and underground structures. Factors influencing heat transfer were identified and evaluated for their effect on ground temperature distribution. The excavation and frost expansion of the ground led to unique lateral deformation of the diaphragm wall. However, the frozen soil effectively resisted earth pressure and suppressed deformation of the wall. The axial stress applied to the braced strut was closely related to the deformation of the diaphragm wall and was influenced by both excavation-induced and frost-expansion pressures. Boreholes near the frozen soil functioned as stress-relief holes, enhancing excavation stability. These comprehensive findings enhance the understanding of AGF techniques and their impact on complex deltaic geological conditions and adjacent structures.

中文翻译：

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人工地层冻结对洛东江三角洲矿床深部基坑稳定性的热力学影响


本文介绍了使用人工地面冻结 （AGF） 方法对洛东江三角洲矿床进行隧道修复工作的深挖案例研究。该研究涉及详细的施工监测和数据分析，以评估对周围地面和地下结构的热和机械影响。确定了影响传热的因素，并评价了它们对地面温度分布的影响。地面的开挖和霜冻膨胀导致连续墙独特的横向变形。然而，冻土有效地抵抗了土压力并抑制了墙体的变形。施加在支撑支柱上的轴向应力与连续墙的变形密切相关，并受开挖诱导压力和霜冻膨胀压力的影响。冻土附近的钻孔起到了消除应力孔的作用，增强了开挖的稳定性。这些全面的发现增强了对 AGF 技术及其对复杂三角洲地质条件和相邻结构的影响的理解。