冻结壁形成特性预报与冻结调控机制在赵固二矿西风井中的应用

赵固二矿西风井井筒穿过冲积层厚704.6m，是我国第四个穿过700m冲积层的井筒。砂性土层最深控制层位冻结壁设计厚度10.3m，平均温度-21.5℃|粘性土层最深控制层位冻结壁设计厚度9.9m，平均温度-19.0℃，掘进模板段高2.5m。调控实现不同层位冻结壁设计厚度、平均温度、井帮温度，不仅能检验冻结方案设计的科学合理性，还对该井冻结段安全经济、快速施工具有重要意义。本文介绍了该井开展冻结壁形成特性实测分析、工程预报及对冻结过程调控，实现了冻结壁设计指标，取得超700m深厚冲积层冻结段安全快速施工成功案例。

The Application of Frozen Wall Formation Characteristics Measurement,Engineering Forecasting and Freezing Control Mechanism in West Air Shaft of Zhaogu No.2 Coal Mine

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.