【摘要】：2000年以來(lái),隨著我國(guó)西部大開(kāi)發(fā)戰(zhàn)略的實(shí)施,該地區(qū)開(kāi)始了有史以來(lái)最大規(guī)模的煤炭新井建設(shè)。西部地區(qū)多為白堊系侏羅系地層,工程與水文地質(zhì)條件與華北沉積平原東部地區(qū)差異很大。我國(guó)現(xiàn)行凍結(jié)法鑿井設(shè)計(jì)與施工規(guī)范(規(guī)程)均基于東部地區(qū)條件,不能簡(jiǎn)單套用。西部地區(qū)凍結(jié)法鑿井多為穿越白堊系侏羅系地層深井基巖凍結(jié),凍結(jié)壓力小,地層以孔隙水滲流場(chǎng)為主,白堊系侏羅系巖遇水砂、泥化是其顯著特點(diǎn)。采用單層結(jié)構(gòu)井壁雖可降低成本,但井壁接茬漏水嚴(yán)重。工程實(shí)踐表明,采用雙層井壁結(jié)構(gòu)通過(guò)壁間注漿,可有效封堵井筒漏水。但簡(jiǎn)單采用現(xiàn)行規(guī)范,勢(shì)必造成內(nèi)層井壁過(guò)厚。因此,基于西部地區(qū)條件,研究雙層井壁結(jié)構(gòu)受力特點(diǎn),優(yōu)化內(nèi)層井壁設(shè)計(jì),有效降低其厚度,是西部地區(qū)深井凍結(jié)急待解決的技術(shù)問(wèn)題。 本文基于西部地區(qū)特點(diǎn),揭示深基巖凍結(jié)法鑿井雙層井壁結(jié)構(gòu)受力特性,為優(yōu)化井壁設(shè)計(jì)提供依據(jù)。首先,將井壁橫截面視為平面問(wèn)題,建立井壁力學(xué)模型,給出內(nèi)壁應(yīng)力計(jì)算公式,分析其受力狀態(tài)。然后,通過(guò)相似模型試驗(yàn),研究在均布圍壓作用下井壁結(jié)構(gòu)應(yīng)力應(yīng)變關(guān)系,得出內(nèi)壁內(nèi)、外側(cè)緣最大應(yīng)力和極限承載力。其后,使用有限元分析軟件ABAQUS,建立井壁結(jié)構(gòu)計(jì)算模型,數(shù)值模擬井壁結(jié)構(gòu)受力狀態(tài),比較模擬結(jié)果和試驗(yàn)結(jié)果,驗(yàn)證了模型試驗(yàn)結(jié)果的正確性。最后,根椐理論與試驗(yàn)結(jié)果,給出了適應(yīng)西部地區(qū)基巖深井凍結(jié)雙層井壁結(jié)構(gòu)混凝土強(qiáng)度提高系數(shù),為井壁優(yōu)化設(shè)計(jì)提供了重要參數(shù)。 研究結(jié)果表明,由混凝土強(qiáng)度提高系數(shù)計(jì)算井壁的極限承載力是可行的,同時(shí)由混凝土強(qiáng)度提高系數(shù)優(yōu)化井壁厚度符合井壁真實(shí)受力狀態(tài),所以上述的優(yōu)化措施能為該類(lèi)井壁優(yōu)化設(shè)計(jì)提供參考。
[Abstract]:Since 2000, with the implementation of the strategy of western development in China, the construction of new coal wells in this area has begun on the largest scale in history. Most of the western areas are Cretaceous Jurassic strata, and the engineering and hydrogeological conditions are quite different from those in the eastern part of North China Sedimentary Plain. The current code for design and construction of freezing shaft sinking in China is based on the conditions of the eastern region and cannot be simply applied. In the west of China, the freezing method is mostly deep well rock freezing through the Cretaceous Jurassic formation, the freezing pressure is small, the formation is dominated by porous water seepage field, the Cretaceous Jurassic rock meets water sand, and mudding is its remarkable feature. Although the cost can be reduced by adopting single-layer structure, the water leakage in the stubble of the shaft lining is serious. The engineering practice shows that the water leakage of wellbore can be effectively sealed by using double-layer shaft lining structure through interwall grouting. But simply adopting the current code will inevitably cause the inner shaft wall to be too thick. Therefore, based on the conditions in the western region, it is an urgent technical problem for freezing deep wells in the western region to study the mechanical characteristics of the double-layer shaft lining structure, optimize the design of the inner shaft wall, and effectively reduce its thickness. Based on the characteristics of the western region, this paper reveals the mechanical characteristics of double-layer shaft lining by freezing deep bedrock method, which provides the basis for optimizing the design of shaft lining. Firstly, the cross-section of the shaft wall is regarded as a plane problem, and the mechanical model of the shaft wall is established, the formula for calculating the stress of the inner wall is given, and the stress state of the shaft wall is analyzed. Then, the stress-strain relationship of shaft wall structure under uniform confining pressure is studied by similar model test, and the maximum stress and ultimate bearing capacity of inner and outer edge of shaft wall are obtained. Then, the finite element analysis software ABAQUS, is used to establish the wellbore structure calculation model. The simulation results and the experimental results are compared to verify the correctness of the model test results. Finally, based on the theoretical and experimental results, the improvement coefficient of concrete strength for frozen double-layer wall structure in deep bedrock wells in western China is given, which provides important parameters for the optimum design of shaft lining. The results show that it is feasible to calculate the ultimate bearing capacity of the shaft wall from the concrete strength enhancement coefficient, and the optimization of the wall thickness by the concrete strength enhancement coefficient is in line with the true stress state of the shaft wall. Therefore, the above optimization measures can provide a reference for the optimization design of this kind of shaft lining.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD262

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