四川省理县—小金公路岩质边坡监测试验研究

In-situ monitoring experiment for rock slope of the Lixian-Xiaojin Highway in Sichuan

根据在四川省理县—小金路震区边坡开展的边坡现场监测试验,并结合监测期间区域范围内发生的三次4.8级以上地震,表明:表面岩体结构面总体出现了一个变形量迅速增大的过程,其施工对震区岩质边坡坡面产生的松散变形影响依然是最大的,施工后坡面在经历2个月的变形衰减后,基本趋于稳定;对于该处边坡的反向结构面,地震还将对坡表岩体结构产生一个挤密的变形作用,这有利于坡表岩层的稳定性;水平位移变化频繁,与该处位置及其荷载、地震激发等因素相关。在该处下边坡设立挡土墙是十分必要的,其后期的观测数据表明该处已基本恢复稳定。

In-situ monitoring experiment was carried out in combination with the slope of the Lixian-Xiaojin Highway in Sichuan province seismic area. In the period of monitoring, three earthquakes whose magnitudes were more than 4.8 grades occurred in this area. Based on the monitoring results, the main conclusions are as followed. The deformation of overall of the surface rock structure has a process of rapid increase, which indicates that the construction still produces the largest affect on the loose deformation of rock slope in this seismic area. The deformation had attenuated for about 2 months, and then tend to be stable. For reverse structural surface, the rock structure of slope surface would also produce compacted deformation by earthquake, which was conducive to the stability of rock slope. The change in horizontal displacement was frequent, which was related to its location, load and seismic excitation. It is necessary to set up retaining walls under the slope. Moreover, the latter observation data indicates that the slope has been basically stabilized.