本文選題：特厚粘土層 + 凍結(jié)壁厚度　； 參考：《安徽理工大學(xué)》2015年碩士論文

【摘要】：我國是能源消費大國,煤炭在我國能源結(jié)構(gòu)中占主要地位。2014年產(chǎn)量28.7億噸,約占世界的一半。隨著地下淺層煤炭資源的日益枯竭,深厚粘土層下煤炭資源的開采越來越多。當(dāng)前在新建設(shè)礦井之中,大多需要穿越深厚粘土層。由于粘土的凍結(jié)強度發(fā)展慢,凍結(jié)強度低,蠕變大且易膨脹,所以在深厚粘土層中采用凍結(jié)法鑿井常常出現(xiàn)一些事故。這都是由于設(shè)計施工不當(dāng),對土的凍結(jié)性能和現(xiàn)場具體情況不夠了解造成的。這些事故中大多是凍結(jié)壁破壞或者凍結(jié)管斷裂,不僅拖延施工進度,還可能會發(fā)生巨大經(jīng)濟損失。因此雖然我國凍結(jié)技術(shù)較為成熟,在較淺礦井建設(shè)中已經(jīng)成功應(yīng)用。但在特厚粘土層中應(yīng)用凍結(jié)法鑿井,在理論上和工程技術(shù)上還存在著較多問題,如何做到快速、安全施工,需要我們進一步研究總結(jié),才能滿足工程實踐要求。 本文結(jié)合顧橋煤礦東回風(fēng)井凍結(jié)段工程和其他凍結(jié)法鑿井成功經(jīng)驗,討論了如何在深厚粘土層中采用凍結(jié)法鑿井安全、快速施工的一些問題。凍結(jié)法鑿井技術(shù)的關(guān)鍵是凍結(jié)方案的設(shè)計,而方案的設(shè)計需要詳細的參數(shù)和相關(guān)的工程經(jīng)驗。針對顧橋東礦回風(fēng)井特厚粘土層凍結(jié)法鑿井實際情況,采用理論分析,實際檢測,工程類比的研究方法,對特厚表土覆蓋中凍結(jié)井的凍結(jié)土的物理力學(xué)性質(zhì),凍結(jié)井壁探討研究。根據(jù)顧東礦工程實際進行凍結(jié)施工設(shè)計,確定凍結(jié)方式、凍結(jié)壁厚度、凍結(jié)孔布置、制冷量。由于深厚粘土層凍結(jié)法鑿井施工不確定性因素較多,工序繁雜,安全隱患較多。近年來,信息化施工技術(shù)在深厚粘土凍結(jié)法鑿井施工中運用廣泛,本文根據(jù)顧橋東礦工程實際情況,建立了整套完善的監(jiān)測體系,對凍結(jié)壓力,凍結(jié)壁溫度場,井幫溫度和凍結(jié)壁位移和變形動態(tài)監(jiān)測,并成功運用于實踐,為顧橋東回風(fēng)井工程安全、快速施工提供保障。 通過工程實踐論證,顧橋東礦回風(fēng)井特層粘土凍結(jié)法鑿井方案設(shè)計是合理的,為今后類似工程提供借鑒經(jīng)驗。
[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.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD265.3

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