玻璃钢在小型U形渠道中的应用研究

发布时间：2018-10-11 08:52

【摘要】：近年来，内蒙古河套灌区大规模修建渠道工程，由于水力条件好、占地少、抗冻胀效果好等优点，U形混凝土渠道广泛应用于各级渠道中。但是，渠基土在冬季负温环境下出现冻胀变形，导致这些渠道出现不同程度的冻胀破坏，甚至失去应用价值。由于玻璃钢衬砌结构的防渗抗冻效果好，逐渐开始应用于小型渠道工程中。本文以河套灌区玻璃钢渠道示范项目为依托，对玻璃钢渠道进行应用研究，得出相关结论，为今后的玻璃钢渠道工程提供理论分析和科学依据。主要内容及结论有：（1）对渠道所用玻璃钢试块进行冻融循环加载，，对未冻融及冻融后的玻璃钢试块进行外观观测和质量称量，制作成拉伸和弯曲试样后，通过拉伸试验和弯曲试验得到冻融循环后玻璃钢的强度和弹性模量的力学性能。试验数据表明玻璃钢材料吸水率很小，且具有很好的抗冻性能，确保了渠道所用玻璃钢材料的实际应用性。（2）采用ANSYS有限元分析软件对玻璃钢、混凝土两种衬砌材料的渠道进行抗冻胀性能模拟分析。根据渠道情况建立有限元模型，通过稳态热分析得到温度场分析结果，转换单元类型后，施加热分析结果进行结构静力分析得到位移场和应力场。分析结果表明，玻璃钢渠道的抗冻胀效果优于混凝土渠道，符合“以柔克刚，适应变形”的新型渠道防渗抗冻胀理论。（3）对玻璃钢渠道和混凝土渠道的经济效益、生态环境效益、社会效益三方面分析。分析结果表明，与混凝土相比，玻璃钢渠道的水力条件好，节水和节地效果高，投资成本虽略有提高，但后期的生态环境效益和社会效益会较明显。综合考虑以上各方面因素，可以表明玻璃钢渠道的整体优势高于混凝土渠道。综上所述，本文通过拉伸试验和弯曲试验测冻融循环后的玻璃钢力学性能，并对玻璃钢渠道和混凝土渠道分别进行数值模拟以及综合效益的理论研究分析，这使小型U形玻璃钢衬砌结构在河套灌区以及北方大部分季节冻土区的应用中具有科学的推广意义。
[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.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV672

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