摘要
研究目的:同时考虑地基土的内摩擦角与黏聚力,对软土地基上的路堤填筑临界高度计算方法基于摩尔库仑理论进行探讨,并与传统的费兰纽斯公式、经验公式等做对比分析,找出他们的不足之处。本文拟从两方面着手进行分析,找出理论公式。研究结论:确定路堤临界填筑高度时:(1)应该同时考虑地基土的内摩擦角与黏聚力,计算结果才能更加可信;(2)通过计算分析,设计临界高度并不是由填筑临界高度简单地适当降低2～3 m,也不能简单地直接按填筑临界高度来设计,而必须根据填筑高度、坡率、列车荷载以及地基参数通过稳定性分析来确定,否则会造成较为保守的设计;(3)以往的方法很少同时考虑土体的内摩擦角φ与黏聚力c,因此,具有一定的局限性;(4)本文同时考虑土体的内摩擦角φ与黏聚力c,推导的理论计算公式可以用于初步确定软弱地基上填方的临界高度。
Research purposes： On consideration of both the internal friction angle and the cohesion, the discussion is made on the determination method for the critical height of a embankment on soft ground based on the Mohr - coulomb theory, and the comparative analysis of it is made with the traditional FeIlanius formula and empirical formula to find out their shortages. This paper presents the theoretical formula based on the analysis of the two aspects. Research conclusions： （ 1 ） The calculating result of determination of the critical height of a embankment is more authentic on consideration of both the internal friction angle and the cohesion at the same time. （2） The calculating analysis shows the critical height should not be designed in the way of reduction of 2 - 3 m of the filling critical height and it should not be designed only on consideration of the filling critical height, but it should be designed on full consideration of the filling height, slope ratio, the train load and the ground parameters. Otherwise a conservative design will be made. （3） In the previous methods, the soil internal friction angleφ and cohesion c are seldom considered, therefore, they have certain limitations. （4）The calculation formula presented in this paper on consideration of the soil internal friction angle φ and cohesion c at the same time can be used for the preliminarily determination of the critical height of the embankment on the soft soil.
出处
《铁道工程学报》
EI
北大核心
2013年第9期20-22,共3页
Journal of Railway Engineering Society
关键词
内摩擦角
黏聚力
路堤
填筑临界高度
internal friction angle
cohesion
embankment
the filling critical height
作者简介
蒋楚生，1964年出生，男，教授级高级工程师。
