斜井冻结壁受力与变形规律研究

Stress and deformation law of inclined shaft freezing wall

采用冻结法凿井的立井井筒在我国已达1100多个,工程数量多,取得的实践经验相对丰富。而采用冻结法施工的斜井井筒只有30多个,工程实例少,施工经验匮乏,对斜井冻结的技术研究就更少。近年来因斜井开拓具有装备简单,运输能力大等优势,在我国西部地区得到广泛应用,因地质条件所限,采用冻结法施工斜井井筒越来越多,工程施工迫切要求对斜井冻结基础理论进行研究与探讨,文章以庞庞塔斜井冻结工程为模型,就不同深度(地压)、不同冻结壁厚度、不同强度的冻结壁与井壁的变形关系进行数值计算研究,探寻各变量之间的相互关系及影响大小,为斜井冻结设计与施工提供指导。该基础研究对斜井冻结多方案对比、优化设计、节能降耗具有重要的参考价值。

The practical experience of freezing method construction for vertical shafts in our country is abundant with more than 1,100 vertical shafts constructed using the technology. However,there are only 30 inclined shafts constructed using the freezing method. There are even fewer technical studies on the freezing of inclined shafts. In recent years,due to the advantages of simple equipment and large transportation capacity,the inclined shaft has been widely used in the western region of China. Due to the limited geological conditions,more and more inclined shafts have been constructed using the freezing method, and the construction is urgently required to freeze the inclined shaft. Based on the research and discussion of the basic theory,Pangpangta inclined shaft freezing project is taken as an example to study the relationship between the deformation of frozen wall and shaft wall with different depth（ground pressure）, different frozen wall thickness,and different strengths. The relationship between the variables and the size of the influences can provide guidance for the design and construction of inclined shafts. This basic research has important reference value for the comparison of multi-scheme freezing,optimization design,and energy saving.