本文選題：鋼纖維混凝土 + 力學(xué)性能　； 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：隨著煤炭資源的不斷開發(fā),新井建設(shè)時(shí)立井井筒穿過的含水不穩(wěn)定沖積層將越來越厚,井壁承受的外荷載也將隨之增加。為抵抗強(qiáng)大的外荷載作用,必須要采用高強(qiáng)井壁結(jié)構(gòu)。采用高強(qiáng)混凝土是提高井壁承載能力的最有效途徑,但隨著混凝土強(qiáng)度等級的提高,混凝土的脆性明顯增加,結(jié)構(gòu)破壞顯突然性。為解決含水不穩(wěn)定沖積層井筒支護(hù)難題,改善高強(qiáng)混凝土的脆性缺陷,提出采用鋼纖維高強(qiáng)混凝土作為筑壁材料,對其力學(xué)特性和井壁結(jié)構(gòu)進(jìn)行研究。首先分析了鋼纖維對混凝土的增強(qiáng)作用和破壞機(jī)理、以及增強(qiáng)效應(yīng)的主要影響因素,進(jìn)行了井壁鋼纖維高強(qiáng)混凝土配制試驗(yàn),并在此基礎(chǔ)上進(jìn)行了力學(xué)性能試驗(yàn),得到了鋼纖維高強(qiáng)混凝土的單軸抗壓、劈裂抗拉、彈性模量、應(yīng)力-應(yīng)變關(guān)系、三軸抗壓等力學(xué)指標(biāo);然后,開展了鋼筋鋼纖維高強(qiáng)混凝土井壁結(jié)構(gòu)模型試驗(yàn),通過模型設(shè)計(jì)和加載試驗(yàn),得到了該種井壁結(jié)構(gòu)應(yīng)力、變形和強(qiáng)度特性;最后,通過ABAQUS軟件,建立了井壁結(jié)構(gòu)分析模型,對該種井壁結(jié)構(gòu)進(jìn)行了數(shù)值模擬分析,根據(jù)計(jì)算結(jié)果,回歸得到了井壁承載力計(jì)算公式。本論文研究結(jié)果表明,鋼纖維能夠有效阻止宏觀裂縫的發(fā)展,鋼纖維高強(qiáng)混凝土的脆性明顯改善,具有較好的延性特征。鋼筋鋼纖維高強(qiáng)混凝土井壁結(jié)構(gòu)在極限承載力和受力特性方面都明顯優(yōu)于鋼筋高強(qiáng)混凝土井壁結(jié)構(gòu),提高了井壁結(jié)構(gòu)的工程可靠性,是一種較為理想的高強(qiáng)井壁結(jié)構(gòu)。
[Abstract]:With the continuous development of coal resources, the unstable alluvium passing through the vertical shaft will be thicker and thicker, and the external load on the shaft wall will also increase during the construction of the new well. In order to resist the strong external load, high-strength shaft lining structure must be adopted. The use of high strength concrete is the most effective way to improve the bearing capacity of shaft lining, but with the increase of strength grade of concrete, the brittleness of concrete increases obviously, and the structural failure is sudden. In order to solve the problem of wellbore support in water-bearing unstable alluvium and to improve the brittle defect of high-strength concrete, steel fiber high-strength concrete is used as wall building material, and its mechanical properties and shaft wall structure are studied. Firstly, the reinforcing effect and failure mechanism of steel fiber on concrete and the main influencing factors of strengthening effect are analyzed, and the preparation test of steel fiber high strength concrete in shaft lining is carried out, and the mechanical properties test is carried out on this basis. The uniaxial compressive resistance, splitting tensile resistance, elastic modulus, stress-strain relation and triaxial compressive strength of steel fiber high strength concrete are obtained. Through model design and loading test, the stress, deformation and strength characteristics of the shaft wall structure are obtained. Finally, through ABAQUS software, the shaft wall structure analysis model is established, and the numerical simulation analysis of the shaft wall structure is carried out, according to the calculated results. The formula of shaft bore bearing capacity is obtained by regression. The results of this paper show that steel fiber can effectively prevent the development of macroscopic cracks and the brittleness of steel fiber high strength concrete is obviously improved and has better ductility. The reinforced steel fiber high strength concrete shaft lining structure is obviously superior to the reinforced high strength concrete shaft lining structure in ultimate bearing capacity and stress characteristics. It improves the engineering reliability of the well wall structure and is an ideal high strength wall structure.
【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】：2017
【分類號】：TD352;TU528

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