高填方对红黏土地基力学性质影响及坡体稳定性

Study on slope stability and the effect of highfill on the mechanical properties of red clay foundation

以云南安宁市一高填方边坡为例,通过勘察、监测等手段,在查明红黏土分布特征的基础上,对填土前后红黏土的物理力学性质变化进行分析,应用数值模拟软件对坡体稳定性进行研究。结果表明,填方工程施工前后,红黏土地基物理力学指标呈现出先降低后增强的特征,致使填土边坡的稳定性呈现出先降低后提高的趋势;坡体上部的地裂缝是在地基土、原地形、填土厚度不均的不利组合下,由于填方体、地基土固结引起坡体的不均匀变形所致,坡体整体稳定。研究成果对于红黏土地基的高填方边坡工程设计、红黏土地基土物理力学指标对坡体稳定性的影响、施工过程中不均匀变形量控制、坡体上部裂缝病害研究具有一定的参考价值和指导意义。

This paper takes a highfill slope in Anning in Yunnan Province as a case,using investigation,monitoring and other methods,on the basis of the distribution characteristics of red clay,the physical and mechanical properties of red clay before and after filling were analyzed,then the stability of slope was studied by numerical simulation software.The results show that the physical and mechanical indexes of the red clay foundation decrease first and then increase before and after the fill project,the stability of the fill slope shows the trend of decrease first and then increase.The ground fissures in the upper part of the slope resulted from the uneven deformation of the slope body were caused by the filling body and the foundation soil consolidation under the unfavorable combination of the foundation soil of the original topography and the uneven thickness of the filling soil,and the slope body is stable in general.Research result has certain reference value and guiding significance to the highfill slope project design of red clay foundation,the study on the influence to slope stability by physical and mechanical index of red clay foundation,the control of inhomogeneous deformation during the construction,crack hazard in the upper part of slope.