河套地区积水地段公路路基基底处理技术研究

发布时间：2018-05-29 20:12

本文选题：风积沙 + 基底处理技术　；参考：《长安大学》2014年硕士论文

【摘要】：内蒙古地区沙漠分布广泛，随着高等级公路的大量修建，筑路材料的问题日益突出，同时还存在着地表常年及季节性积水、土壤盐渍化等不良地基问题。国内对于风积沙的路用性能和不良地基处理技术有着广泛深入的研究，然而利用风积沙材料处理积水地段公路路基基底的研究尚少，工程中有应用但缺乏理论分析和技术指南。本文以河套地区省道212线五原至刘召段一级公路工程为依托，针对沿线低洼积水路段的路基基底处理技术进行系统研究，为风积沙应用于基底处理提供了理论支撑，拓宽了风积沙的应用途径，对内蒙地区的公路建设和沙害防治有着重要意义。本文首先进行了内蒙古风积沙特性和积水地段处治方案研究，通过参阅大量文献和项目试验资料，总结出内蒙古风积沙的物理特性、化学特性和力学特性；对工程沿线低洼积水路段进行调查，分析了风积沙处理不良路基基底的可行性，在原方案的基础上，优化提出了碎石渣垫层、风积沙垫层、风积沙垫层加铺土工格室三种基底处治方案。其次，采用ABAQUS软件建立风积沙路基有限元模型，得出换填厚度，路堤高度、边坡坡度、包边土厚度三种结构参数和风积沙、地基土、包边土三种材料力学参数对路基沉降和稳定性的影响规律，推荐出了河套地区积水地段风积沙路基适宜结构体系；对三种方案的试验路路基进行了沉降计算和边坡稳定性分析，综合对比其处治效果，从理论上验证了风积沙处理积水地段路基基底的可行性。最后结合实体工程施工及检测资料，对碎石渣、风积沙、土工格室三种基底处治方案的施工工艺和质量控制进行了技术总结；在试验路段埋设沉降板并持续观测获得风积沙路基分层沉降数据，对三种方案的路基沉降规律进行了分析和评价。实测结果表明，，经三种方案处理后的路基工后沉降满足规范要求，处治效果良好。
[Abstract]:The desert is widely distributed in Inner Mongolia. With the construction of high grade highway, the problem of road building material is becoming more and more serious. At the same time, there are many problems such as perennial and seasonal water accumulation, soil salinization and so on. In our country, the road performance of eolian sand and the technology of bad foundation treatment have been studied extensively and deeply. However, there is little research on the treatment of highway subgrade base with eolian sand material, and there is a lack of theoretical analysis and technical guidance in engineering. Based on the first class highway project from Wuyuan to Liuzhao section of provincial highway 212 in Hetao area, this paper makes a systematic study on subgrade basement treatment technology of low-lying waterlogged section along the route, which provides theoretical support for the application of eolian sand to base treatment. The application of eolian sand is widened, which is of great significance to highway construction and sand damage prevention in Inner Mongolia. In this paper, the characteristics of eolian sand in Inner Mongolia and the treatment scheme of hydrological area are studied. The physical, chemical and mechanical properties of eolian sand in Inner Mongolia are summarized by referring to a large number of documents and project test data. Based on the investigation of low-lying waterlogged sections along the engineering line, the feasibility of aeolian sand treatment of bad subgrade base is analyzed. On the basis of the original scheme, the gravel slag cushion and aeolian sand cushion are optimized. There are three kinds of basement treatment schemes for wind sand cushion overlay geogrid room. Secondly, the finite element model of eolian sand subgrade is established by using ABAQUS software, and three structural parameters, such as replacement fill thickness, embankment height, slope gradient, embankment soil thickness and aeolian sand, foundation soil are obtained. The influence of mechanical parameters of three kinds of materials on the settlement and stability of embankment is studied. The suitable structure system of aeolian sand roadbed in hydrological section of Hetao area is recommended, and the settlement calculation and slope stability analysis of the roadbed of three schemes are carried out. Compared with the treatment effect, the feasibility of treatment of subgrade base in hydrological section by eolian sand is verified theoretically. Finally, the construction technology and quality control of three kinds of basement treatment schemes, such as gravel slag, eolian sand and geogrid room, are summarized based on the construction and inspection data of solid engineering. The subgrade settlement data of eolian sand subgrade were obtained by continuous observation in the experimental section, and the subgrade settlement law of three schemes was analyzed and evaluated. The measured results show that the settlement of the roadbed after construction meets the requirements of the code, and the treatment effect is good.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1

【参考文献】