麦秸秆纤维水泥土室内实验研究

发布时间：2018-04-08 07:10

本文选题：水泥土　切入点：麦秸秆纤维　出处：《安徽理工大学》2017年硕士论文

【摘要】：对软土的加固和处理一直是岩土工程界一个重大的难题。江苏东台地区由于受到海水的影响,堆积了很厚的软粘性土,形成了比较有代表性的软弱土层。该土层以淤泥质土为主,地耐力差,不能很好满足建设的要求。因此,工程上经常采用水泥作为固化剂,与土搅拌在一起形成力学性能较好的水泥土。水泥土由于其材料价格低廉、操作方法简单,在地基加固、边坡稳定、路基工程中也有着十分广泛的应用。本论文就以东台地区的软土为实验对象,研究它的加固特性。同时,利用麦秸秆纤维能够承受较大拉力的特点,探讨了向水泥土中掺入麦秸秆纤维来提升水泥土力学性能的方法。论文的主要研究内容和成果如下:(1)对东台地区软土采用水泥进行固化,对固化后的东台软土进行了室内无侧限抗压实验,考虑了水泥掺量和龄期这两种因素对水泥土强度的影响,还得到了水泥土应力应变关系曲线,从曲线中可以读出水泥土随着水泥掺量的增加有向脆性方向发展的趋势。(2)研究了麦秸秆纤维在不同PH值的酸碱性溶液中的腐蚀情况。对腐蚀过后的麦秸秆进行质量损失率计算和抗拉实验。从而对麦秸秆纤维的力学特性有一个基本的了解和认识。实验表明,酸性环境和碱性环境对麦秸秆的腐蚀机理完全不一致。(3)通过大量实验得出了麦秸秆纤维水泥土的最优配比,采用控制单一变量的方法分别确定麦秸秆的最优掺入率和最优加筋长度。最终确定秸秆的最佳掺入比为0.1%,最优掺入长度为5mm。(4)将素水泥土和麦秸秆水泥土进行了对比,证明水泥土中掺入麦秸秆嫩能够提高水泥土的强度和抵抗变形的能力,还能够降低水泥土的脆性化。
[Abstract]:The reinforcement and treatment of soft soil has always been a major problem in geotechnical engineering.Due to the influence of sea water, the Dongtai area of Jiangsu Province accumulates thick soft clay soil and forms a relatively representative soft soil layer.The soil layer is mainly silt soil, and its soil endurance is poor, so it can not meet the requirements of construction.Therefore, cement is often used as curing agent and mixed with soil to form cement soil with better mechanical properties.Cement soil is widely used in foundation reinforcement, slope stability and roadbed engineering because of its low material price and simple operation method.In this paper, the soft soil in Dongtai area is taken as the experimental object to study its reinforcement characteristics.At the same time, the method of adding wheat straw fiber to cement soil to improve the mechanical properties of cement soil was discussed.The main contents and results of this paper are as follows: (1) cement is used to solidify soft soil in Dongtai area.Considering the influence of cement content and age on the strength of cement-soil, the stress-strain relationship curve of cement-soil is obtained.The corrosion of wheat straw fiber in acid-base solution with different PH value was studied by readout from the curve that the cement soil has the tendency of developing towards brittleness with the increase of cement content.The mass loss rate and tensile test of wheat straw after corrosion were calculated.So there is a basic understanding of the mechanical properties of wheat straw fiber.The results show that the corrosion mechanism of wheat straw in acidic environment and alkaline environment is completely inconsistent. 3) the optimum proportion of wheat straw fiber cement soil is obtained by a large number of experiments.The optimal incorporation rate and reinforcement length of wheat straw were determined by controlling a single variable.Finally, the optimum blending ratio of straw is 0.1 and the optimum mixing length is 5mm. 4) the comparison between the plain cement soil and wheat straw cement soil proves that adding wheat straw into cement soil can improve the strength of cement soil and the ability of resisting deformation.It can also reduce the brittleness of cement soil.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU411

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