摘要
考虑到现实工程中含软弱夹层的边坡一般都是逐渐发生破坏的,而夹层的破坏对边坡的稳定性具有十分重要的影响。因此明确剪切速率对边坡软弱夹层破坏机理的影响具有较重要的工程意义。为此本文采用室内试验和颗粒流模拟方法尝试揭示剪切速率对软弱夹层破坏机理的影响。首先通过直剪试验明确夹层土体的力学参数,然后结合前人的宏细观参数率定方法得出细观模拟参数。在此基础上开展不同剪切速率下的夹层破坏机理对比分析。研究表明,较低的剪切速率使得变形更多地集中于夹层与围岩界面,其强度更多地反映了二者之间的相互作用,较高的剪切速率会使夹层中前部的结构变化趋势向后平移,主要影响范围为剪切面附近。夹层的抗剪强度随剪切速率的增大呈先降低后增大的趋势。得出的结论可为含软弱夹层的边坡稳定性控制提供一定指导。
Considering that the slope with weak interlayer is generally destroyed gradually in practical engineering,and the failure of interlayer has a very important impact on the stability of slope.Therefore,it is of great engineering significance to clarify the influence of shear rate on the failure mechanism of weak intercalation.Therefore,this paper attempts to reveal the influence of shear rate on the failure mechanism of weak interlayer by means of laboratory test and particle flow simulation.Firstly,the mechanical parameters of intercalated soil are determined by direct shear test,and then the meso simulation parameters are obtained by combining with the previous macro and micro parameter calibration methods.On this basis,the failure mechanism of interlayer under different shear rates is analyzed.The results show that the lower shear rate makes the deformation more concentrated on the interface between the interlayer and surrounding rock,and its strength reflects the interaction between the two.The higher shear rate makes the structural change trend of the front part of the interlayer shift backward,and the main influence range is near the shear plane.The shear strength of interlayer decreases first and then increases with the increase of shear rate.The conclusion can provide some guidance for slope stability control with weak interlayer.
作者
惠军
Hui Jun(Jiangsu Geological Environment Exploration Institute,Nanjing 210012,China)
出处
《科技通报》
2021年第12期61-70,共10页
Bulletin of Science and Technology
关键词
软弱夹层
边坡稳定性
剪切速率
细观模拟
参数率定
weak interlayer
slope stability
shear rate
meso simulation
parameter calibration
