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洗衣粉污染土工程性質劣化機理及改良方法研究

發(fā)布時間:2018-06-03 06:53

  本文選題:洗衣粉污染土 + 生物酶改良 ; 參考:《中南林業(yè)科技大學》2017年碩士論文


【摘要】:本文通過室內試驗,分別對洗衣粉污染土和生物酶改良洗衣粉污染土的物理力學性質進行研究,并且采用固結屈服應力py'和孔隙指數IV等指標,研究生物酶改良洗衣粉污染土的壓縮特性。本文在文獻調研的基礎上,通過室內試驗,研究了三個方面的內容。首先,試驗研究了不同洗衣粉質量分數對土體物理力學性質的影響規(guī)律。其次,以生物酶為改良材料,對洗衣粉污染土進行改良,研究了不同生物酶含量下,洗衣粉污染土的物理力學性質變化規(guī)律。再次,以三種不同質量分數下的洗衣粉污染土為研究對象,基于雙對數曲線法和歸一化法,采用固結屈服應力和孔隙指數等指標,研究生物酶改良洗衣粉污染土的壓縮性質。研究內容如下:1.洗衣粉污染土物理力學性質采用人工方法配置不同洗衣粉質量分數的污染土樣,洗衣粉質量分數分別為Og/kg、3.0g/kg、6.0g/kg、12g/kg及24g/kg。通過液塑限聯(lián)合試驗,研究洗衣粉污染土的液塑限隨洗衣粉質量分數變化關系,塑性指數隨洗衣粉質量分數變化關系;通過重型標準擊實試驗,研究洗衣粉污染土的最大干密度和最佳含水率隨洗衣粉質量分數變化關系;通過快速剪切試驗,研究洗衣粉污染土的抗剪強度隨洗衣粉質量分數的變化關系;通過固結試驗,研究洗衣粉污染土的壓縮系數和壓縮模量隨洗衣粉質量分數變化關系。2.生物酶改良洗衣粉污染土物理力學性質以洗衣粉質量分數為24g/kg洗衣粉污染土為研究對象,采用五種不同配比的生物酶進行改良,生物酶配比分別為0,1:100,1:200,1:300及1:400,該比例為生物酶與干土的質量比。通過液塑限聯(lián)合試驗,研究生物酶改良洗衣粉污染土的液塑限隨洗衣粉質量分數變化關系,塑性指數隨洗衣粉質量分數變化關系;通過重型標準擊實試驗,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隨洗衣粉質量分數變化關系;通過快速剪切試驗,研究生物酶改良洗衣粉污染土的抗剪強度隨洗衣粉質量分數的變化關系;通過固結試驗,研究生物酶改良洗衣粉污染土的壓縮系數和壓縮模量隨洗衣粉質量分數變化關系。試驗研究結果分別與未改良洗衣粉污染土進行對比分析。3.生物酶改良洗衣粉污染土壓縮特性研究通過固結試驗,研究三種不同洗衣粉質量分數(Og/kg、6.0g/kg、24g/kg),五種不同生物酶配比(0,1:100,1:200,1:300、1:400)下的壓縮特性。為了得到生物酶含量對洗衣粉污染土的壓縮特性的影響規(guī)律,同時得出生物酶最佳摻量,采用了兩個理論方法研究了以下內容:(1)采用Butterfield雙對數曲線法確定試樣的固結屈服應力py',研究固結屈服應力py'隨生物酶含量的變化關系。(2)引入歸一化參數孔隙指數Iv評價生物酶改良洗衣粉污染土壓縮特性,研究孔隙指數Iv隨生物酶含量的變化關系。
[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.
【學位授予單位】:中南林業(yè)科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TU411

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