关键词:

深厚富水弱胶结围岩 , 冻结深度 , 影响因素 , 岩性分布规律

Abstract: Abstract: In China’s western coal mines, shafts need pass through deep, water-rich, weakly cemented surrounding rock for-mations from Cretaceous and Jurassic periods. Artificial ground freezing methods are applied during the construction of large-diameter shafts. Determining the appropriate frozen depth is crucial for safe and successful shaft lining construction. In the case of deep shaft freezing, the cost of freezing significantly increases with depth. To rationally determine the shaft lining's frozen depth, the factors influencing frozen depth are analyzed, and a comprehensive assessment based on two main factors: the loca-tion and dimensions of shaft-related chambers and the geological conditions of the shaft (including engineering and hydrogeo-logical conditions) are proposed. By combining specific analyses of shaft-related chambers, rock distribution patterns, and wa-ter content in the main and auxiliary shafts of a particular mine, along with insights from neighboring mine shaft construction experiences, an optimized frozen depth plan for the shaft lining are proposed. The advantages and disadvantages are analyzed, and a technical and economic comparison are performed. The research methodology can provide as a technical reference for determining shaft lining frozen depths under similar geological conditions.