摘要
采用颗粒流方法的基本理论,结合软土地基上填土土坡稳定工程实例,利用二维颗粒流程序(PFC2D)对土坡的接触应力场和位移场进行了模拟。根据土坡位移场的变化来确定滑动面的位置和形状,克服了传统连续介质力学的宏观连续性假设,这比传统土坡临界滑动面搜索方法更加合理。颗粒流方法模拟的滑动面近似为对数螺旋面,这与滑坡后实测的滑动面形状比较吻合。基于瑞典圆弧滑动法和颗粒流位移场得到的滑动面,计算和比较了土坡稳定的安全系数。
The contact stress and displacement fields of a fill slope on soft ground of a case study are simulated using PFC2D. Based upon the variation of displacement field of the sliding slope from PFC2D, the location and shape of sliding surface are determined, which overcomes the deficiency of macro-continuity assumption in continuum mechanics and is more logical than conventional search method for locating the critical sliding surface. Moreover, it is noted that the shape of simulated sliding surface employing PFC2D is approximately a logarithmic spiral surface which is well in agreement with the in-situ measured sliding surface after the fill slope failure was occurred. Finally, the factors of safety of the fill slope based the Swedish circular sliding method and the sliding surface from displacement field variation of PFC2D analysis are computed and compared, respectively.
出处
《浙江科技学院学报》
CAS
2006年第1期45-49,共5页
Journal of Zhejiang University of Science and Technology
基金
国家自然科学基金资助项目(40406019)
浙江省自然科学基金资助项目(Y104281)
关键词
颗粒流程序
填土土坡
软土地基
接触应力场
位移场
滑动面
Particle Flow Code （PFC）
fill slope
soft ground
contact stress field
displacement field
sliding surface
