文档介绍：摘要
随着石灰改良土技术的发展,采用低剂量的石灰改良土填筑的路基,在保证路堤边坡强度安全,使用稳定的前提下,适当增加边坡坡率,在技术上有充分的理论支撑。同时,提高石灰改良土路堤坡率,不仅可以降低路基土方工程量和工程造价;而且还可以减少公路建设中不可再生土地资源的征用。合理确定石灰改良土填筑路堤结构边坡坡率,技术上有良好支撑,经济上可降低造价,符合资源节约型和环境友好型高等级公路建设的指导方针,具有重要的社会意义。本文以江苏省省道243路堤边坡工程为依托,主要开展了以下的研究工作:
(1)阐述了边坡可靠性的概念,总结分析了边坡稳定分析极限平衡法的原理,归纳了边坡临界坡率的计算方法,介绍了软件Geo-Slope和FLAC的原理和基本特点,并讨论了有限元强度折减法的原理。
(2)利用Geo-Slope软件建立理想边坡模型分析了边坡稳定性随着边坡坡率以及边坡高度变化的规律,结合省道243两个不同场区的边坡工程实例,利用软件建立实际模型,分析了不同坡率和高度对工程稳定的影响并提出了合理的坡率。并利用FLAC进行了验证,最后得出了结论。
关键词:坡率;石灰改良土;Geo-Slope;边坡稳定;极限平衡;强度折减;安全系数; FLAC
Abstract
With lime soil improvement and technological development, under the premise of use and stability, using low doses of lime filling the roadbed improved soil and increasing slope rate appropriately, is technically fully support by the theory. At the same time, increase the slope rate of lime improved road, not only can reduce the volume of earthworks and roadbed construction cost, but also can reduce road construction in the non-renewable resources of the land expropriation. Rationally determine the lime filling improved soil structure slope embankment slope rate, a good technical support, the economic cost can be reduced, in line with resource-saving and environment-friendly highway construction guidelines and has important social meaning. In this paper, Jiangsu Province, 243 provincial highway embankment slope engineering as the basis, mainly in the following research work:
(1)Have explained the concept of dependability of sloping, Summarize and analyze the principle of the terminal equilibrium law of the analysis that the slope is stable, Have summed up puting technology of the critical slope rate of side slope, Have introduced software Geo-Slope and the principle of FLAC and basic characteristic and discussed the principles of the strength reduction method.
(2)Use Geo-Slope software to establish an ideal model slope and Analyzed slope stability with and law of change more in slope in rate in slope. Combined the side slope project embodi