顾桥东特厚粘土层冻结凿井安全快速施工研究

发布时间：2018-04-26 01:23

本文选题：特厚粘土层 + 冻结壁厚度　；参考：《安徽理工大学》2015年硕士论文

【摘要】：我国是能源消费大国,煤炭在我国能源结构中占主要地位。2014年产量28.7亿吨,约占世界的一半。随着地下浅层煤炭资源的日益枯竭,深厚粘土层下煤炭资源的开采越来越多。当前在新建设矿井之中,大多需要穿越深厚粘土层。由于粘土的冻结强度发展慢,冻结强度低,蠕变大且易膨胀,所以在深厚粘土层中采用冻结法凿井常常出现一些事故。这都是由于设计施工不当,对土的冻结性能和现场具体情况不够了解造成的。这些事故中大多是冻结壁破坏或者冻结管断裂,不仅拖延施工进度,还可能会发生巨大经济损失。因此虽然我国冻结技术较为成熟,在较浅矿井建设中已经成功应用。但在特厚粘土层中应用冻结法凿井,在理论上和工程技术上还存在着较多问题,如何做到快速、安全施工,需要我们进一步研究总结,才能满足工程实践要求。本文结合顾桥煤矿东回风井冻结段工程和其他冻结法凿井成功经验,讨论了如何在深厚粘土层中采用冻结法凿井安全、快速施工的一些问题。冻结法凿井技术的关键是冻结方案的设计,而方案的设计需要详细的参数和相关的工程经验。针对顾桥东矿回风井特厚粘土层冻结法凿井实际情况,采用理论分析,实际检测,工程类比的研究方法,对特厚表土覆盖中冻结井的冻结土的物理力学性质,冻结井壁探讨研究。根据顾东矿工程实际进行冻结施工设计,确定冻结方式、冻结壁厚度、冻结孔布置、制冷量。由于深厚粘土层冻结法凿井施工不确定性因素较多,工序繁杂,安全隐患较多。近年来,信息化施工技术在深厚粘土冻结法凿井施工中运用广泛,本文根据顾桥东矿工程实际情况,建立了整套完善的监测体系,对冻结压力,冻结壁温度场,井帮温度和冻结壁位移和变形动态监测,并成功运用于实践,为顾桥东回风井工程安全、快速施工提供保障。通过工程实践论证,顾桥东矿回风井特层粘土冻结法凿井方案设计是合理的,为今后类似工程提供借鉴经验。
[Abstract]:China is a big energy consuming country, coal occupies the main position in the energy structure of our country. In 2014, the output is 2.87 billion tons, which accounts for about half of the world. With the depletion of underground shallow coal resources, more and more coal resources are mined under deep clay layer. At present, most of the newly constructed mines need to pass through the deep clay layer. Because the freezing strength of clay develops slowly, the freezing strength is low, the creep is large and easy to expand, so some accidents often occur in deep clay strata by freezing method. This is due to improper design and construction, soil freezing performance and site conditions are not well understood. Most of these accidents are frozen wall damage or frozen pipe breakage, which not only delays the construction progress, but also may cause huge economic losses. Therefore, although freezing technology is more mature in China, it has been successfully applied in shallow mine construction. However, there are still many problems in theory and engineering technology in the application of freezing method in the thick clay layer. How to do fast and safe construction needs further study and summary in order to meet the requirements of engineering practice. Based on the successful experience of freezing section engineering and other freezing method in the east return air shaft of Guqiao Coal Mine, this paper discusses some problems about how to use freezing method to drill well safely and quickly in deep clay layer. The key of freezing drilling technology is the design of freezing scheme, which needs detailed parameters and relevant engineering experience. In view of the actual situation of freezing method in the return air shaft of Guqiao East Mine, the physical and mechanical properties of freezing soil in the freezing well covered by thick topsoil are studied by theoretical analysis, practical detection and engineering analogy. Study on freezing shaft lining. According to the actual freezing construction design of Gudong Mine, the freezing mode, freezing wall thickness, freezing hole arrangement and refrigerating capacity are determined. There are many uncertain factors, complicated working procedures and many hidden safety problems in deep clay layer freezing method. In recent years, information construction technology has been widely used in deep clay freezing shaft sinking. According to the actual situation of Guqiao East Mine, a complete set of perfect monitoring system has been set up, and the freezing pressure and freezing wall temperature field have been established. Dynamic monitoring of wall temperature, displacement and deformation of frozen wall is successfully applied in practice, which provides guarantee for engineering safety and rapid construction of Guqiao East return Air well. Through engineering practice, it is reasonable to design the freezing method of clay freezing in the return air shaft of Guqiao East Mine, which provides reference experience for similar projects in the future.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD265.3

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