黄土直立性特征分析及应用
发布时间：2018-08-04 21:18
【摘要】：黄土广泛分布在亚洲、欧洲和北美,主要是一种风成沉积物。因其具有特殊工程性质,故被划分为特殊土,我国对黄土的研究主要是在建国以后,大量的工程活动相继展开,使得黄土研究有了长足的进展。黄土的研究主要都是从结构、垂直节理、大孔隙、形成历史条件等方面研究展开的,而国外对于黄土的研究多是从地理与环境方面出发的。关于黄土直立性的研究国内外的研究资料都较少,本文主要围绕直立性影响因素展开论述。本文是在翻阅了大量的相关文献、研究资料和实际野外地质观察发现的基础上,通过分析黄土的沉积历史及气候、节理裂隙、孔隙及微结构、粘聚力、基质吸力和盐类等对黄土直立性的影响因素进行了综合分析,重点论述粘聚力与基质吸力对其直立性的影响,通过边坡、基坑、洞室等具体工程实例进行分析研究。粘聚力与基质吸力对黄土直立性的影响,由试验确立粘聚力与基质吸力的变化关系,分析基质吸力变化对粘聚力的影响。通过变化不同的基质吸力得到具体的粘聚力数值,运用数值软件FLAC3D、理正深基坑等分别对边坡与窑洞进行数值分析,得出粘聚力、基质吸力对其稳定性的影响,最终证明其对直立性的影响。通过对基坑边坡和洞室进行数值分析与计算,得出粘聚力和基质吸力的增加对基坑边坡与洞室的稳定都是有益的,分析不同的粘聚力和基质吸力数值变化对位移场、应力场的影响来反映数值变化对工程活动稳定性的影响大小。从而指导具体的工程实践,利用黄土直立性有利特点,使得工程活动更加合理安全经济。
[Abstract]:Loess is widely distributed in Asia, Europe and North America, mainly as a kind of aeolian sediment. Because of its special engineering nature, it is divided into special soil. The study of loess in our country is mainly after the founding of the people's Republic of China, a large number of engineering activities have been carried out one after another, which has made great progress in the study of loess. The study of loess is mainly from the aspects of structure, vertical joints, macropores, formation of historical conditions and so on, while the study of loess abroad is mostly from the aspects of geography and environment. There are few domestic and international research materials on the vertical property of loess, and this paper mainly discusses the influence factors of the vertical property. Based on a large number of related documents, research data and field geological observations, this paper analyzes the sedimentary history and climate of loess, joints and fissures, pores and microstructures, and cohesion. The influence factors of matrix suction and salt on the vertical property of loess are comprehensively analyzed, and the influence of cohesion and matrix suction on the vertical property of loess is discussed in detail. The concrete engineering examples such as slope, foundation pit and cavern are analyzed and studied. The influence of cohesion and matrix suction on the vertical behavior of loess was studied. The relationship between cohesion and matrix suction was established by experiments, and the influence of matrix suction on cohesion was analyzed. The specific cohesion value is obtained by changing the different matrix suction. The numerical analysis of slope and cave is carried out by using numerical software FLAC3D and deep foundation pit, and the influence of cohesion and matrix suction on its stability is obtained. Finally, its influence on the erectivity was proved. Through the numerical analysis and calculation of the slope and cavity of foundation pit, it is concluded that the increase of cohesion and matrix suction is beneficial to the stability of the slope and cavern of foundation pit. The effect of stress field on the stability of engineering activity is reflected by numerical change. So it can guide the concrete engineering practice and make use of the favorable characteristics of loess upright to make the engineering activities more reasonable, safe and economical.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.131
本文编号：2165179
[Abstract]:Loess is widely distributed in Asia, Europe and North America, mainly as a kind of aeolian sediment. Because of its special engineering nature, it is divided into special soil. The study of loess in our country is mainly after the founding of the people's Republic of China, a large number of engineering activities have been carried out one after another, which has made great progress in the study of loess. The study of loess is mainly from the aspects of structure, vertical joints, macropores, formation of historical conditions and so on, while the study of loess abroad is mostly from the aspects of geography and environment. There are few domestic and international research materials on the vertical property of loess, and this paper mainly discusses the influence factors of the vertical property. Based on a large number of related documents, research data and field geological observations, this paper analyzes the sedimentary history and climate of loess, joints and fissures, pores and microstructures, and cohesion. The influence factors of matrix suction and salt on the vertical property of loess are comprehensively analyzed, and the influence of cohesion and matrix suction on the vertical property of loess is discussed in detail. The concrete engineering examples such as slope, foundation pit and cavern are analyzed and studied. The influence of cohesion and matrix suction on the vertical behavior of loess was studied. The relationship between cohesion and matrix suction was established by experiments, and the influence of matrix suction on cohesion was analyzed. The specific cohesion value is obtained by changing the different matrix suction. The numerical analysis of slope and cave is carried out by using numerical software FLAC3D and deep foundation pit, and the influence of cohesion and matrix suction on its stability is obtained. Finally, its influence on the erectivity was proved. Through the numerical analysis and calculation of the slope and cavity of foundation pit, it is concluded that the increase of cohesion and matrix suction is beneficial to the stability of the slope and cavern of foundation pit. The effect of stress field on the stability of engineering activity is reflected by numerical change. So it can guide the concrete engineering practice and make use of the favorable characteristics of loess upright to make the engineering activities more reasonable, safe and economical.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.131
【参考文献】
相关期刊论文 前1条
1 李宁军,夏永旭;基质吸力对非饱和黄土隧道力学特性影响研究[J];西安公路交通大学学报;2000年02期
，本文编号：2165179
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