摘要
采用路基稳定性分析的Bishop法,模拟分析了软土路基中一侧临空的路基、高水位一侧临空的路基,高路堤一侧临空的路基三种模式下,填土层和天然软土层的强度参数内聚力、内摩擦角变化及填土容重变化、下卧层厚度变化对路基稳定性的影响机制。结果表明,在这三种模式下路基的稳定性随着填土层或软土层内聚力和内摩擦角的增大而增加,随着填土容重的增大而减小;在一定厚度范围内,随下卧层厚度增大而减小;高水位和高路堤都在一定程度上降低了路基的稳定性。同时发现,同一土层中内聚力和内摩擦角的相对影响程度取决于该层在整个路基稳定性影响深度范围中所占的比例,不同土层受内聚力和内摩擦角的影响程度也与该层在整个路基稳定性影响深度范围中所占的比例有关。
The effects of some factors on the soft soil subgrade stability are simulated and analyzed by Bishop＇s method. The factors include the intensity parameters, the cohesion and the friction angle of the filled soil layer and natural soft soil layer, the unit weight of filled soil layer, the thickness of underground soft soil layer. The influence mechanism is simulated in three cases： simple subgrade with one side vacant, higher water lever subgrade with one side vacant, higher embankment subgrade with one side vacant. The result indicates that： 1. the stability of the soft soil subgrade is enhanced as the cohesion and friction angle increases, but drops along with the increase of unit weight of the filled soil; 2. in some range of the thickness of the underground soft soil, the stability of the soft soil subgrade decreases as the thickness of the underground soft soil increases ;3. high water level and high embankment reduces the stability of the soft soil subgrade to a certain extent; 4. in the same soil layer, the comparative influence of the cohesion and the friction angle depends on the thickness proportion of this layer in the whole stability influential soil, as well as the is influence for different soil layers.
出处
《地下空间与工程学报》
CSCD
北大核心
2009年第2期372-377,共6页
Chinese Journal of Underground Space and Engineering
基金
上海市重点学科建设项目资助(B308)
