【摘要】：近年來，內(nèi)蒙古河套灌區(qū)大規(guī)模修建渠道工程，由于水力條件好、占地少、抗凍脹效果好等優(yōu)點(diǎn)，U形混凝土渠道廣泛應(yīng)用于各級渠道中。但是，渠基土在冬季負(fù)溫環(huán)境下出現(xiàn)凍脹變形，導(dǎo)致這些渠道出現(xiàn)不同程度的凍脹破壞，甚至失去應(yīng)用價值。由于玻璃鋼襯砌結(jié)構(gòu)的防滲抗凍效果好，逐漸開始應(yīng)用于小型渠道工程中。本文以河套灌區(qū)玻璃鋼渠道示范項目為依托，對玻璃鋼渠道進(jìn)行應(yīng)用研究，得出相關(guān)結(jié)論，為今后的玻璃鋼渠道工程提供理論分析和科學(xué)依據(jù)。主要內(nèi)容及結(jié)論有： （1）對渠道所用玻璃鋼試塊進(jìn)行凍融循環(huán)加載，，對未凍融及凍融后的玻璃鋼試塊進(jìn)行外觀觀測和質(zhì)量稱量，制作成拉伸和彎曲試樣后，通過拉伸試驗和彎曲試驗得到凍融循環(huán)后玻璃鋼的強(qiáng)度和彈性模量的力學(xué)性能。試驗數(shù)據(jù)表明玻璃鋼材料吸水率很小，且具有很好的抗凍性能，確保了渠道所用玻璃鋼材料的實(shí)際應(yīng)用性。 （2）采用ANSYS有限元分析軟件對玻璃鋼、混凝土兩種襯砌材料的渠道進(jìn)行抗凍脹性能模擬分析。根據(jù)渠道情況建立有限元模型，通過穩(wěn)態(tài)熱分析得到溫度場分析結(jié)果，轉(zhuǎn)換單元類型后，施加熱分析結(jié)果進(jìn)行結(jié)構(gòu)靜力分析得到位移場和應(yīng)力場。分析結(jié)果表明，玻璃鋼渠道的抗凍脹效果優(yōu)于混凝土渠道，符合“以柔克剛，適應(yīng)變形”的新型渠道防滲抗凍脹理論。 （3）對玻璃鋼渠道和混凝土渠道的經(jīng)濟(jì)效益、生態(tài)環(huán)境效益、社會效益三方面分析。分析結(jié)果表明，與混凝土相比，玻璃鋼渠道的水力條件好，節(jié)水和節(jié)地效果高，投資成本雖略有提高，但后期的生態(tài)環(huán)境效益和社會效益會較明顯。綜合考慮以上各方面因素，可以表明玻璃鋼渠道的整體優(yōu)勢高于混凝土渠道。 綜上所述，本文通過拉伸試驗和彎曲試驗測凍融循環(huán)后的玻璃鋼力學(xué)性能，并對玻璃鋼渠道和混凝土渠道分別進(jìn)行數(shù)值模擬以及綜合效益的理論研究分析，這使小型U形玻璃鋼襯砌結(jié)構(gòu)在河套灌區(qū)以及北方大部分季節(jié)凍土區(qū)的應(yīng)用中具有科學(xué)的推廣意義。
[Abstract]:In recent years, due to the advantages of good hydraulic condition, less land occupation and good frost resistance, U-shaped concrete channel has been widely used in all levels of canal construction in Hetao Irrigation District, Inner Mongolia. However, the frost heave deformation of the canal foundation soil in the negative temperature environment in winter results in different degrees of frost heave damage in these channels, and even loses its application value. Due to the good anti-seepage and anti-freezing effect of FRP lining structure, it is gradually applied to small-scale canal engineering. Based on the demonstration project of FRP channel in Hetao Irrigation District, this paper studies the application of FRP channel, draws relevant conclusions, and provides theoretical analysis and scientific basis for the future FRP channel project. The main contents and conclusions are as follows: (1) Freeze-thaw cycle loading is carried out on the FRP specimen used in the channel, and the appearance observation and quality weighing of the FRP specimen after freeze-thaw and freeze-thaw are carried out, and the tensile and bending specimens are made. The mechanical properties of the strength and elastic modulus of FRP after freeze-thaw cycle were obtained by tensile test and bending test. The experimental data show that the water absorption rate of FRP is very small and has good frost resistance, which ensures the practical application of FRP used in the channel. (2) FRP is analyzed by ANSYS finite element analysis software. The anti-frost swelling performance of two kinds of concrete lining materials was simulated and analyzed. The finite element model is established according to the situation of the channel. The results of temperature field analysis are obtained by steady-state thermal analysis, and the displacement field and stress field are obtained by the static analysis of structure by heating analysis after the type of unit is changed. The results show that the frost heaving resistance of FRP channel is better than that of concrete channel, which accords with the new anti-seepage and anti-freezing theory of FRP channel and concrete channel. (3) the economic benefit of FRP channel and concrete channel. Ecological environmental benefit and social benefit are analyzed in three aspects. The results show that compared with concrete, FRP canal has better hydraulic condition, higher water saving and land saving effect and higher investment cost, but the ecological and environmental benefits and social benefits will be obvious in the later stage. Considering the above factors, the overall advantage of FRP channel is higher than that of concrete channel. To sum up, the mechanical properties of FRP after freeze-thaw cycle were measured by tensile test and bending test. This makes the application of small U-shaped FRP lining structure in Hetao Irrigation area and most seasonal frozen soil regions in northern China have scientific significance.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV672

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