In order to realize safe and rapid construction of mine shaft crossing loose layer and water-rich area of intensely weathered zone in bedrock, the author analyzes the difficulties in freezing construction and put forward the solution, with full consideration of the survey results of surface hydrogeology and geology, the shaft cross section and domestic construction level of inclined shaft, as well as the principle of safety and reliability, economy, freezing - tunneling combination and servicing tunneling. The freezing scheme is designed scientifically using the technology of freezing vacuum and insulation, treatment technology of freezing connection section in inclined shaft, calculation method of freezing the two sides through vertical holes and fixed beam model in inclined shaft. Equivalent freezing time and control technology of excavation section and the method of freezing step-by-step input are proposed in the construction. The outside holes are connected along the shaft, the middle row of holes are connected along the transverse direction, with segmented freezing and step-by-step input. The freezing-tunneling coordination is explored and optimized, the freezing cost is reduced by 10%, and the tunneling efficiency is improved by 15%.%为了井筒安全、 快速穿过松散层及基岩强风化带富水性强的区域,根据地表水文地质、 地质探测结果,结合井筒断面、 支护设计及国内斜井施工水平,以安全可靠、 经济节约、冻掘配合、 服务掘进为原则,分析了冻结施工的难点,提出了解决对策.采用冻结真空隔热管技术、 斜井冻结衔接段处理技术、 斜井竖孔冻结两帮冻结壁固定梁模型计算方法,科学制定冻结方案,并在施工中提出采用斜井掘砌断面等效冻结时间及调控技术、 冻结步进式投入方法,外排孔沿井筒走向串联,中排孔横向串联运行,分段冻结,分步投入.探索优化冻掘配合,取得了降低冻结成本10%,提高掘进效率15%的良好效果,对类似斜井局部冻结施工有一定的借鉴意义.
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