山区公路沿河路基稳定性分析评价与设计

发布时间：2018-06-09 14:47

本文选题：沿河路基 + 失稳破坏机理　；参考：《重庆交通大学》2014年硕士论文

【摘要】：随着我国公路等基础设施建设的不断发展,在西部山区修筑了大量的沿河公路,而这些沿河公路时常发生道路交通的短期或长期中断,首要原因就是沿河路基极易发生变形失稳而导致的破坏。河水的不断的浸润冲刷,路基极易发生由路基填土流失所致的破坏变形且难于补救。滑坡、亏坡和崩塌是沿河路基破坏的常见表现,有关沿河失稳破坏灾害的报道每年都可以看到,尤以降水量大、地形复杂、地质不良的四川、重庆、贵州、云南等地的发生最多最频繁。沿河路基失稳直接影响了当地的道路交通,阻碍了当地的物流及经济发展。本文旨在研究多种动态因素共同影响下沿河路基变形失稳机理及稳定性分析与评价方法。沿河路基的破坏,实质上是长期动水压力作用下水流冲刷、岩土体在孔隙压力、渗透力作用下的长期应变积累的过程。同时不同断面形式的沿河路基具有不同的渗流特点,需要对不同形式山区沿河路基中水的渗流规律进行分析,对路基结构的工程适宜性进行评价,提出沿河路基典型断面的结构形式。同时为了提高路基稳定性,优化设计沿河路基防排水系统。通过严谨的分析研究,取得以下两方面的进展： (1)在对路基土体渗流特征进行分析的基础上,对各种影响路基稳定性的因素进行分析研究,找出导致沿河路基失稳破坏的控制因素,对库水位作用下路基的稳定性破坏机理进行研究。 (2)对不同水位差条件下的沿河路基填料、路基典型的断面构造以及路基防渗设施布置形式的适用性和有效性进行分析,总结沿河路基中的渗流特点与相应的路基排水系统的设计原则。
[Abstract]:With the continuous development of infrastructure construction such as highways in our country, a large number of riverine highways have been built in the western mountainous areas, and these riverine highways often have short or long term interruptions of road traffic. The first reason is that the roadbed along the river is prone to deformation and instability. With the continuous infiltration and erosion of the river, the subgrade is prone to damage and deformation caused by the subgrade fill loss, which is difficult to remedy. Landslide, slope loss and collapse are common manifestations of roadbed damage along the river. Reports on the disasters of instability and destruction along the river can be seen every year, especially in Sichuan, Chongqing, Guizhou, where the precipitation is large, the topography is complex, and the geology is poor. Yunnan and other places occur the most frequently. The instability of roadbed along the river directly affects the local road traffic and hinders the local logistics and economic development. The purpose of this paper is to study the mechanism of deformation and instability and the method of stability analysis and evaluation of roadbed along the river under the influence of various dynamic factors. The damage of roadbed along river is essentially the process of long-term strain accumulation under the action of long-term hydrodynamic pressure and long-term strain accumulation of rock and soil under the action of pore pressure and permeability. At the same time, different types of subgrade along the river have different seepage characteristics. It is necessary to analyze the seepage law of water in the embankment along the river in different forms of mountain area, and evaluate the engineering suitability of the subgrade structure. The structural form of typical section of roadbed along river is put forward. At the same time, in order to improve the stability of subgrade, the waterproofing and drainage system of roadbed along river is optimized. Through rigorous analysis and research, the following two advances have been made: (1) based on the analysis of seepage characteristics of subgrade soil, various factors affecting the stability of roadbed are analyzed and studied. To find out the controlling factors that lead to the instability and failure of roadbed along the river, and to study the mechanism of stability failure of roadbed under the action of reservoir water level. Based on the analysis of the applicability and effectiveness of the typical section structure of the subgrade and the arrangement of the seepage prevention facilities of the roadbed, the seepage characteristics of the roadbed along the river and the design principles of the corresponding subgrade drainage system are summarized.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1

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