洗衣粉污染土工程性质劣化机理及改良方法研究

发布时间：2018-06-03 06:53

本文选题：洗衣粉污染土 + 生物酶改良　；参考：《中南林业科技大学》2017年硕士论文

【摘要】：本文通过室内试验,分别对洗衣粉污染土和生物酶改良洗衣粉污染土的物理力学性质进行研究,并且采用固结屈服应力py'和孔隙指数IV等指标,研究生物酶改良洗衣粉污染土的压缩特性。本文在文献调研的基础上,通过室内试验,研究了三个方面的内容。首先,试验研究了不同洗衣粉质量分数对土体物理力学性质的影响规律。其次,以生物酶为改良材料,对洗衣粉污染土进行改良,研究了不同生物酶含量下,洗衣粉污染土的物理力学性质变化规律。再次,以三种不同质量分数下的洗衣粉污染土为研究对象,基于双对数曲线法和归一化法,采用固结屈服应力和孔隙指数等指标,研究生物酶改良洗衣粉污染土的压缩性质。研究内容如下:1.洗衣粉污染土物理力学性质采用人工方法配置不同洗衣粉质量分数的污染土样,洗衣粉质量分数分别为Og/kg、3.0g/kg、6.0g/kg、12g/kg及24g/kg。通过液塑限联合试验,研究洗衣粉污染土的液塑限随洗衣粉质量分数变化关系,塑性指数随洗衣粉质量分数变化关系;通过重型标准击实试验,研究洗衣粉污染土的最大干密度和最佳含水率随洗衣粉质量分数变化关系;通过快速剪切试验,研究洗衣粉污染土的抗剪强度随洗衣粉质量分数的变化关系;通过固结试验,研究洗衣粉污染土的压缩系数和压缩模量随洗衣粉质量分数变化关系。2.生物酶改良洗衣粉污染土物理力学性质以洗衣粉质量分数为24g/kg洗衣粉污染土为研究对象,采用五种不同配比的生物酶进行改良,生物酶配比分别为0,1:100,1:200,1:300及1:400,该比例为生物酶与干土的质量比。通过液塑限联合试验,研究生物酶改良洗衣粉污染土的液塑限随洗衣粉质量分数变化关系,塑性指数随洗衣粉质量分数变化关系;通过重型标准击实试验,研究生物酶改良洗衣粉污染土的最大干密度和最佳含水率随洗衣粉质量分数变化关系;通过快速剪切试验,研究生物酶改良洗衣粉污染土的抗剪强度随洗衣粉质量分数的变化关系;通过固结试验,研究生物酶改良洗衣粉污染土的压缩系数和压缩模量随洗衣粉质量分数变化关系。试验研究结果分别与未改良洗衣粉污染土进行对比分析。3.生物酶改良洗衣粉污染土压缩特性研究通过固结试验,研究三种不同洗衣粉质量分数(Og/kg、6.0g/kg、24g/kg),五种不同生物酶配比(0,1:100,1:200,1:300、1:400)下的压缩特性。为了得到生物酶含量对洗衣粉污染土的压缩特性的影响规律,同时得出生物酶最佳掺量,采用了两个理论方法研究了以下内容:(1)采用Butterfield双对数曲线法确定试样的固结屈服应力py',研究固结屈服应力py'随生物酶含量的变化关系。(2)引入归一化参数孔隙指数Iv评价生物酶改良洗衣粉污染土压缩特性,研究孔隙指数Iv随生物酶含量的变化关系。
[Abstract]:In this paper, the physical and mechanical properties of laundry powder contaminated soil and bioenzyme modified laundry powder contaminated soil were studied in laboratory, and some indexes such as consolidation yield stress py' and porosity index IV were used. The compression characteristics of detergent contaminated soil modified by biological enzymes were studied. On the basis of literature research, this paper studies three aspects through laboratory experiments. Firstly, the effect of different mass fraction of washing powder on physical and mechanical properties of soil was studied. Secondly, the soil contaminated with detergent powder was improved by using biological enzyme as the improved material, and the change of physical and mechanical properties of the soil contaminated with detergent powder was studied under the different content of biological enzyme. Thirdly, based on the double logarithmic curve method and normalization method, the compressive properties of laundry powder contaminated soil improved by biological enzyme were studied by using the indexes of consolidation yield stress and pore index, taking three kinds of laundry powder contaminated soil with different mass fraction as the research object, based on the double logarithmic curve method and the normalization method. The research is as follows: 1. The physical and mechanical properties of detergent contaminated soil were prepared by artificial method. The mass fraction of detergent powder was 3.0 g / kg / kg ~ 6.0 g / kg and 24 g / kg 路kg ~ (-1) respectively. Through the combined liquid-plastic limit test, the relationship between liquid-plastic limit and washing powder mass fraction and plastic index with washing powder mass fraction were studied, and the heavy duty standard compaction test was carried out to study the relationship between liquid plastic limit and washing powder mass fraction. The relationship between the maximum dry density and the optimum moisture content of laundry powder contaminated soil with the mass fraction of washing powder was studied, the shear strength of laundry powder contaminated soil with the mass fraction of washing powder was studied by rapid shear test, and the consolidation test was carried out. The relationship between compression coefficient and modulus of detergent contaminated soil with the mass fraction of detergent powder was studied. Improvement of physical and mechanical properties of laundry powder contaminated soil by biological enzymes five different proportions of biological enzymes were used to improve the physical and mechanical properties of laundry powder contaminated soil using 24g/kg detergent as the object of study. The ratio of enzyme to dry soil is 0: 100: 1: 200: 1: 300 and 1: 400, respectively. The ratio is the ratio of enzyme to dry soil. Through the combined liquid-plastic limit test, the relationship between the liquid-plastic limit and the mass fraction of detergent powder was studied, and the plastic index was changed with the mass fraction of detergent powder, and the heavy duty standard compaction test was carried out. The relationship between the maximum dry density and the optimum moisture content of the soil contaminated with biological enzymes was studied. The relationship between shearing strength and washing powder mass fraction of bioenzyme modified laundry powder contaminated soil was studied, and the relation of compression coefficient and compression modulus with washing powder mass fraction was studied by consolidation test. The experimental results were compared with the unmodified detergent contaminated soil. Study on the Compression characteristics of contaminated soil modified by Biological enzymes the compression properties of three different washing powder mass fractions were studied under three different mass fractions of 0. 0 g / kg or 6. 0 g / kg ~ (24 g / kg) and five different ratios of enzymes: 0: 100 / 1: 1: 1: 1: 300: 1: 400). In order to obtain the effect of bioenzyme content on the compression characteristics of washing powder contaminated soil, the optimum amount of bioenzyme was obtained. In this paper, the following two theoretical methods are used to study the following contents: 1) the Butterfield double logarithmic curve method is used to determine the consolidation yield stress of the sample, and the relationship between the consolidation yield stress py' and the biological enzyme content is studied. (2) the normalized parameter porosity index is introduced. V to evaluate the compression characteristics of bioenzyme modified laundry powder contaminated soil, The relationship between porosity index (v) and enzyme content was studied.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU411

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