【作者】 尹小涛； 王水林； 马双科；

【Author】 YIN Xiao-tao1,WANG Shui-lin1,MA Shuang-ke2(1 State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;2.Xi’an Research Institute of Highway,Xi’an,Shaanxi 710054,China;)

【机构】 中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室； 西安公路研究所；

【摘要】 利用颗粒流PFC2D建立了碎石土物理模型,在此基础上,设计了0.1-0.2m、0.1-0.3m、0.1-0.4m粒组均以物理模型为折减计算初始模型一次折减和连续递进折减两类计算方案,仅对内聚力0.1MPa进行折减,内摩擦角为35度保持不变。每类计算方案包含100、20、4.0、0.8、0.16、0.035、0.0kPa等7种内聚力折减工况。经对相同粒组、不同粒组对比分析了其坡面演替、监测点x方向速度变化曲线等计算结果,发现:随着粒组范围的扩大,不平衡力和速度变化曲线震荡幅度均增加,碎石土边坡表现出极强的伪稳定性降低,这种稳定性的降低是局限于架空结构内部的,整体稳定性是增强的;坡体移动由整体弧形模式向局部移动调整模式过渡;大颗粒的出现使得滑移阻滞效果明显,滑移范围缩小,移动的阶段调整性明显。更多还原

【Abstract】 Physical model of gravel soil mass is built by means of particle flow code software.Based on these,two types of initial calculating condition are designed under three types of grain group such as 0.1-0.2m,0.1-0.3m and 0.1-0.4m,one computing condition is all discounting from initial physical model,the other is all continuously beginning with the previous discounting computing result.Each discounting scheme contains seven kinds of only cohesion discounting method such as 100kPa,20kPa,4.0kPa,0.8kPa,0.16kPa,0.035kPa and 0.0kPa,while the friction angle being 35 degree.Furthermore,the evolutional map of slope shape unbalance force and velocity in x direction of monitoring point within the same grain group and different groups are compared and analyzed.Found that the vibrating extent of unbalance force and velocity in x direction enhances with increasing of the grain group,which presents the pseudo-stability decreasing of gravel soil slope,these decreasing only limits within the elevated structures,the overall stability being enhanced,that the slipping mode is changing from overall arch to local mobile adjustment,and that the existence of large granular makes the slipping block effect apparent and limits the slip scope,which proves the phasing adjustment of slip procedure.更多还原