关键词: 冻结壁形成特性, 工程预报, 冻结调控机制, 掘砌配合

Abstract: The thickness of alluvium is 704.6m in Zhaogu No.2 coal mine, and West Air Shaft is the fourth 700m alluvium shaft. The design thickness of the deepest control horizon on sandy soil is 10.3m, and its average temperature is -21.5℃. The design thickness of the deepest control horizon on clay is9.9m, and its average temperature is -19.0℃, The height of excavation template section is 2.5m. The regulate and control of frozen wall design thickness, average temperature and sidewall temperature is not only valuable to test scientific rationality of design thickness but also significant to safe, economical and fast construction. The frozen wall formation characteristics measurement , engineering forecasting and freezing control mechanism are proposed. The frozen wall design index is realized. Successful cases of safe and rapid construction in freezing section of over 700 m deep alluvium are obtained.