摘要
采用颗粒流方法的基本理论,利用基于离散单元法的二维颗粒流程序(PFC2D),建立软黏土的颗粒流模型,对软土路基填土土坡的接触应力场和位移场进行模拟,然后在该土坡模型基础上加入碎石桩,模拟碎石桩对土坡稳定的作用。该方法克服了传统的连续介质力学模型的宏观连续性假设,对比研究了碎石桩加固前后的土坡在滑动时位移场的变化,以及不同桩径、不同间距、不同桩长对土坡的加固效果。研究表明,碎石桩桩长对抗滑能力有明显的影响,随着桩长增加,碎石桩抗滑能力显著提高;不同桩径的碎石桩,抗滑能力不同,随着桩径加大,抗滑能力提高;桩间距对抗滑能力的影响,需根据桩径优化确定,发挥桩与土共同作用。
Usig the basic theory of particle flow code （PFC）, based on PFC2D procedure of the discrete unit method, it is established a model of soft soil particle flow to simulate the contact stress field and displacement field of the filled slope of a soft soil roadbed, as well as the effect of using gravel piles on reinforcing the slope. In the analysis, macroscopic continuous supposition of the traditional continuous medium model is overcome; it is studied and compared the change in the displacement field of the shope during slip before and after being strengthened by the gravel piles, as well as the effects of different pile diameter, space and length of the gravel piles. The results show that pile length has an obvious iafluence on the antislip capacity, i.e. the capacity of a gravel pile is improved evidently with its length increases. The gravel piles with different diameters have different capacities of antislip, i.e. with an increase in pile diameter antislip capacity is also raised. The influence of a pile space on the antislip capacity should be determined according to the optimization of a pile diameter, so as to use the co-action of pile and soil.
出处
《工业建筑》
CSCD
北大核心
2008年第12期76-79,共4页
Industrial Construction
关键词
离散单元法
颗粒流数值模拟
填土土坡
软土路基
discrete element method
numerical simulation by particle flow code
filled slope
soft roadbed
