基于变形监测的边坡稳定性及加固方案探讨

Analysis of Slope Stability and Reinforcement Scheme Based on Deformation Monitoring

通过对某高速公路的高边坡滑移变形进行地表位移监测,分析坡体不同区域的变形特征、临空面与滑面变化趋势,以及岩体结构对坡体稳定性的影响。结合降雨量和监测数据,探讨降雨与边坡位移的影响规律,从而得出反倾软质岩边坡的稳定性影响因素。监测数据表明,受降雨、临空面开挖及岩体结构的影响,边坡出现牵引区和变形区2种变形特征区域;变形区存在3个阶段:①坡体变形随时间而匀速增长的线性变形期;②裂缝后缘及两侧坡体随之加速变形的失稳期;③坡体应力重分布形成二次应力场的固结稳定期。而牵引区整个过程变形较小;反倾软质岩边坡变形受层面影响,但不受层面控制;地表水渗入则是坡体变形的主要诱因,工程设计中注意地表排水及深层排水。

Based on the surface displacement monitoring of the high slope sliding deformation of a highway,the deformation characteristics of different areas of the slope,the change trends of free surface and sliding surface,and the influence of rock mass structure on the slope stability are analyzed.Combined with daily rainfall and monitoring data,the corresponding laws of rainfall and slope displacement are discussed,and the influencing factors of the stability of the anti-inclined soft rock slope are obtained.The monitoring data shows that,influenced by rainfall,free face excavation and rock mass structure,there are two kinds of deformation characteristic areas of the slope:traction area and deformation area;there are three stages in the deformation area,one is the linear deformation period in which the deformation of the slope increases with time at a constant rate;the other is the deformation instability period in which the deformation of the back edge of the crack and the two sides of the slope accelerates with time;the third is the consolidation stability period in which the secondary stress isformed by the redistribution of the slope stress.While the deformation of traction area is small;the deformation of the anti-inclined soft rock slope is under the influence rather than the control of the layer.In addition,the infiltration of surface water is the main cause of the slope deformation,and the surface drainage and the water discharge in the slope should be paid attention to in the engineering design.