山区公路软弱地基处理技术与应用研究

发布时间：2018-04-11 16:03

本文选题：软土路基 + 加固技术　；参考：《重庆交通大学》2014年硕士论文

【摘要】：由于我国西部地区山河纵横、地形地质条件十分复杂,交通基础设施建设中将不可避免的面临软弱地基处理问题,软基加固已成为交通建设领域亟需解决的难点问题,也是道路工程建设中的技术关键。本文结合现阶段西部地区在建公路项目,对软基稳定性影响因素、各类软土路基处理方法进行分析、比较及分析,探讨了如何依据工程地质条件、道路条件、施工条件以及建设费用合理的选择软基处治方案,主要结论如下： (1)山地型软土散布于我国广大山地区域,其沉积环境与工程特性与沿海型软土及内陆淤积型软土均有较大不同,一般沉积于岭脚山涧等低洼地带,经历长期的干湿循环、生化变异及沉积作用而形成。 (2)路堤高度及软土厚度对软土路基边坡稳定性影响显著。随着路堤高度的增搞,路基安全系数随之逐渐减小,路基边坡危险滑面位置及滑弧半径也在不断发展。随着软弱土层厚度的逐渐增厚,路基边坡安全系数呈现出逐步减小的趋势,路基边坡危险滑面逐渐向路堤内部发展。 (3)通过对粉喷桩法加固软基数值模拟,可以看出伴随着打桩及路堤填筑施工作业的进行,不同的施工步下路基实时沉降增量各不相同。粉喷桩法有效地制约了软弱地层受荷压缩变形的趋势,提高了软土路基的承载能力。 (4)粉喷桩及强夯法加固处治技术对该地区软土地基的处理均可以达到设计要求,但粉喷桩加固处理的资源投入较大,而强夯法法加固处理时要求地基含水量必须较低。强夯法存在较大噪音污染,并且对周边已有建筑物、构造物会的稳定有用的影响。粉喷桩虽然无污染且工期较短,但要求投入较大,成本较高。
[Abstract]:Because of the mountains and rivers in the west of China, the terrain and geological conditions are very complex, the traffic infrastructure construction will inevitably face the problem of soft foundation treatment, soft foundation reinforcement has become a difficult problem to be solved in the field of traffic construction.Also is the technical key in the road engineering construction.This paper analyzes, compares and analyzes the influencing factors of soft foundation stability and the treatment methods of various soft soil subgrade, and discusses how to base on the engineering geological conditions and road conditions, in connection with the highway projects under construction in the western region at present.The main conclusions are as follows: (1) the construction conditions and the construction cost should be reasonable to select the soft foundation treatment scheme, and the main conclusions are as follows:The sedimentary environment and engineering characteristics of the mountainous soft soil are different from those of the coastal soft soil and the inland silt soft soil. Generally, they are deposited in the low-lying areas such as the mountain stream at the foot of the mountain, and have experienced a long period of dry and wet cycles.Biochemical variation and deposition.The height of embankment and the thickness of soft soil have significant influence on the slope stability of soft subgrade.With the increase of embankment height, the subgrade safety coefficient decreases gradually, and the dangerous slide surface position and slide arc radius of roadbed slope are also developing.With the increasing of the thickness of soft soil, the safety factor of roadbed slope decreases gradually, and the dangerous slip surface of roadbed slope gradually develops to the interior of embankment.3) through numerical simulation of soft foundation strengthened by powder jet pile method, it can be seen that with the construction of piling and embankment filling, the real time settlement increment of subgrade is different with different construction steps.Powder injection pile method effectively restricts the tendency of compression and deformation of soft ground and improves the bearing capacity of soft soil subgrade.4) the treatment of soft soil foundation by powder jet pile and dynamic compaction method can meet the design requirements, but the resource input for the treatment of powder jet pile is large, and the water content of the foundation must be lower when the method of dynamic compaction is used to reinforce the foundation.The dynamic compaction method has a large noise pollution, and has a useful influence on the stability of the surrounding buildings and structures.Although powder jet pile has no pollution and short time limit, it needs more investment and higher cost.
【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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