静态淋溶作用对煤矸石路基沉降的影响
发布时间：2018-10-11 10:24
【摘要】：现已有大量试验结果证明煤矸石作为道路工程中的路基填料,在正常情况下路用性能可以达标,但在自然环境中,淋溶作用是否会对煤矸石路基沉降产生影响并未得到验证。因此本论文采取静态淋溶的试验方法,模拟阴雨、酸雨、地上水位上升以及工业和生活废水浸淹环境条件下,研究淋溶作用对煤矸石路基沉降的影响。 本文选用东胜煤矸石和乌海煤矸石进行试验。试验采用CH3COOH、中性以及NaOH淋溶液,每种淋溶液下设1:1、1：2.5、1：3、1：4、1：5的五个固液比组,分别测定试验小组在1、3、7、11、15天后堆积液的pH值,并将影响变化最大的初始淋溶液固液比为1：1的煤矸石进行X射线衍射技术(XRD)分析,研究其物质成分变化,最后对其进行FLAC (Fast Lagrangian Analysis of Continua-快速拉格朗日分析法)数值软件模拟,研究煤矸石路基沉降,并通过pH值、XRD图谱变化规律对数值模拟的路基沉降发生的变化进行分析。 研究结果表明,经过淋溶作用,两地煤矸石的最终淋溶液均为酸性,且所含高岭石和SiO2的含量都有所变化,并会生成一些黏性物质,导致酸碱液浸泡过的东胜、乌海煤矸石路基沉降都相对较小,因此,当煤矸石路基处于酸碱液淋溶作用条件下,若达到本文试验模拟的情况下时,会减小路基沉降量。
[Abstract]:A large number of test results have proved that coal gangue, as the subgrade filler in road engineering, can meet the road performance under normal conditions, but in the natural environment, the effect of leaching on the settlement of coal gangue subgrade has not been verified. In this paper, the static leaching test method is adopted to simulate the effects of leaching on the settlement of coal gangue roadbed under the conditions of rain, acid rain, rising water level above ground and flooding of industrial and domestic wastewater. In this paper, Dongsheng coal gangue and Wuhai coal gangue are selected for test. CH3COOH, neutral solution and NaOH solution were used in the experiment. Each solution was divided into five solid-liquid ratio groups of 1: 1: 1: 1: 1: 1: 4 and 1: 5, respectively. The pH values of the accumulated liquid in the test group after 15 days were measured respectively. The coal gangue, whose initial leaching solution solid-liquid ratio is 1:1, is analyzed by X-ray diffraction (XRD) technique, and the change of its material composition is studied. Finally, the numerical simulation of the coal gangue with FLAC (Fast Lagrangian Analysis of Continua- fast Lagrangian analysis is carried out. The settlement of coal gangue roadbed is studied, and the change of numerical simulation subgrade settlement is analyzed by pH value and XRD diagram. The results show that after leaching, the final leaching solution of coal gangue in both places is acidic, and the contents of kaolinite and SiO2 are changed, and some viscous substances are formed, which leads to Dongsheng, which has been soaked in acid and alkali solution. The settlement of coal gangue roadbed in Wuhai is relatively small. Therefore, when the roadbed of coal gangue is in the condition of acid and alkali leaching, the settlement of roadbed will be reduced if the simulation of this paper is achieved.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
本文编号：2263846
[Abstract]:A large number of test results have proved that coal gangue, as the subgrade filler in road engineering, can meet the road performance under normal conditions, but in the natural environment, the effect of leaching on the settlement of coal gangue subgrade has not been verified. In this paper, the static leaching test method is adopted to simulate the effects of leaching on the settlement of coal gangue roadbed under the conditions of rain, acid rain, rising water level above ground and flooding of industrial and domestic wastewater. In this paper, Dongsheng coal gangue and Wuhai coal gangue are selected for test. CH3COOH, neutral solution and NaOH solution were used in the experiment. Each solution was divided into five solid-liquid ratio groups of 1: 1: 1: 1: 1: 1: 4 and 1: 5, respectively. The pH values of the accumulated liquid in the test group after 15 days were measured respectively. The coal gangue, whose initial leaching solution solid-liquid ratio is 1:1, is analyzed by X-ray diffraction (XRD) technique, and the change of its material composition is studied. Finally, the numerical simulation of the coal gangue with FLAC (Fast Lagrangian Analysis of Continua- fast Lagrangian analysis is carried out. The settlement of coal gangue roadbed is studied, and the change of numerical simulation subgrade settlement is analyzed by pH value and XRD diagram. The results show that after leaching, the final leaching solution of coal gangue in both places is acidic, and the contents of kaolinite and SiO2 are changed, and some viscous substances are formed, which leads to Dongsheng, which has been soaked in acid and alkali solution. The settlement of coal gangue roadbed in Wuhai is relatively small. Therefore, when the roadbed of coal gangue is in the condition of acid and alkali leaching, the settlement of roadbed will be reduced if the simulation of this paper is achieved.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
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