垃圾焚烧底渣加筋土的力学性能研究

发布时间：2018-02-01 10:25

本文关键词： 底渣底渣加筋土三向格栅土工格室三轴试验　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：垃圾焚烧底渣是城市生活垃圾在经过了焚烧处理后所得到的混合灰渣,经过分离处理除去飞灰后所剩下的固体残余物。论文以底渣加筋土作为研究对象,拟将其作为路基填料。在大量的试验与实地调研的情况下,着重分析了不同筋材加筋后,得到了底渣加筋土的强度和变形特性,主要研究内容如下:对底渣进行了筛分试验和击实试验得到了底渣的基本物理性质,通过归纳和总结发现底渣从粒径上说是粗粒土,与沙土的相似度很高,并得到了底渣的最优含水率和最大干密度。通过大型直剪试验、压缩试验、大型三轴试验,得到了底渣的压缩模量、压缩指数以及c、φ值。利用大型三轴固结排水试验对分别对格栅加筋底渣和格室加筋底渣进行了研究,得到了不同加筋底渣在不同σ3的条件下的应力—应变曲线。通过对曲线进行分析,分析每种围压下曲线的走势计算出了不同σ3的条件下各曲线的峰值,得出结论:对格栅加筋底渣而言,加筋的层数n和布筋间距都对加筋效果产生影响,通过对比试验分析出主要影响和次要影响,并利用试验得到了格栅的最优布筋层数。利用大型三轴固结排水试验对格室加筋底渣进行了研究,得到了在三种工况下,格室加筋底渣的应力-应变曲线,当加筋层数n和格室高度h作为参数时,格室加筋底渣的应力-应变关系,通过对曲线的分析,分析在每种围压下曲线的走势,计算出了不同σ3的条件下各曲线的峰值。并依靠对比试验得出结论;格室高度h是影响格室加筋底渣加筋效果的最主要因素。最后从三个角度对两种筋材的加筋效果进行了对比:依据应力应变曲线,通过软件计算,得到了破坏点强度,从破坏点强度的角度进行了对比;根据不同加筋土在各种工况下的破坏点强度,得到p-q曲线,通过线性拟合得到线性回归方程和总离差平方和,通过计算得到加筋土的c和φ值,从c、φ值的角度进行了对比;引入加筋效果系数,利用不同工况下的加筋效果下属对土工格栅和土工格室两种加筋材料进行对比。最终发现,高度较高的格室加筋效果最优。土工格栅和土工格室两种材料,其实分别代表着平面加筋材料和三维立体加筋材料。由此可见研究立体材料的加筋是以后选择筋体的主要方向。
[Abstract]:MSW incineration slag is a mixture of MSW after incineration treatment, which is a solid residue after separating and removing fly ash. In this paper, the reinforced soil of MSW is taken as the research object. It is intended to be used as subgrade filler. Based on a large number of tests and field investigations, the strength and deformation characteristics of reinforced soil with different reinforcement materials are obtained. The main research contents are as follows: the basic physical properties of the bottom slag are obtained by sieving and compacting tests. It is found that the bottom slag is coarse grained soil from the particle size and has a high similarity with sandy soil. The optimum moisture content and maximum dry density of bottom slag are obtained. Through large direct shear test, compression test and large triaxial test, the modulus of compression, compression index and c of bottom slag are obtained. 蠁 value. The reinforcement bottom slag of grid and the reinforced bottom slag of lattice chamber were studied by means of large scale triaxial consolidation and drainage test. The stress-strain curves of different reinforced bottom slag under different 蟽 _ 3 conditions are obtained. By analyzing the curves, the peak values of each curve under different 蟽 _ 3 conditions are calculated by analyzing the trend of the curves under different confining pressures. Conclusion: for the grille reinforced bottom slag, the reinforcement layer number n and the spacing of the reinforcement have an effect on the reinforcement effect, and the main influence and the secondary effect are analyzed through the comparative test. The optimum reinforcement layer number of grid is obtained by experiment. The stress strain curve of reinforced bottom slag of lattice chamber under three conditions is obtained by using large scale triaxial consolidation and drainage test. When the reinforcement layer number n and the height h of the lattice chamber are taken as parameters, the stress-strain relationship of the reinforced bottom slag of the lattice chamber is analyzed. Through the analysis of the curve, the trend of the curve under each kind of confining pressure is analyzed. The peak values of the curves under different 蟽 3 conditions are calculated, and the conclusions are obtained by the contrast test. Lattice height h is the most important factor affecting the reinforcement effect of the reinforced bottom slag. Finally, the reinforcement effect of the two kinds of reinforced material is compared from three angles: according to the stress-strain curve, the software is used to calculate the reinforcement effect. The failure point strength is obtained and compared from the point of view of failure point strength. According to the strength of the failure point of the reinforced soil under various conditions, the p-q curve is obtained, the linear regression equation and the sum of the total deviation square are obtained by linear fitting, and the values of c and 蠁 of the reinforced soil are calculated from c. The angle of 蠁 value is compared. The reinforcement effect coefficient is introduced and the geogrid and geogrid are compared with the geogrid and the geogrid under different working conditions. Finally, the results are found. The geogrid and geogrid are two kinds of materials. In fact, it represents the plane stiffened material and the three-dimensional solid reinforced material, which shows that the research on the reinforcement of the three-dimensional material is the main direction of the later selection of the stiffened body.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X799.3;TU43

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