龙南高速路基边坡监测技术应用研究

Longnan Expressway Embankment Slope Construction Monitoring Technique

为了研究路基边坡土壤的力学效应、检测设计和施工的安全性以及边坡的稳定状态,建立结构监测系统,开展边坡工程实时在线监测尤为必要。依托龙南高速路基边坡工程,建立一套边坡监测系统平台,对边坡稳定性进行有效监控,通过在挡墙顶部安装盒式测斜仪对边坡挡墙的位移实时监测,掌握边坡坡脚的的位移变化情况,选点安装导轮固定测斜仪对边坡土层不同深度的位移变化进行监测,及时掌握边坡内部变形情况,安装孔隙水压计、雨量计等对边坡周围地下水位、降雨量进行在线监测,掌握地下水位对岩体抗滑力的影响,判别坡体的应力性能,该边坡运营期的表面水平位移实测值在-6~11 mm之间波动,竖直方向在-3~10 mm之间波动。数据并无明显趋势变化,边坡深基点在X、Y方向的倾斜位移在合理的范围内波动,未出现明显趋势位移变化,降雨量范围为0~25 mm,地下水位未造成岩体抗滑力的下降,由此判定边坡运营阶段的工作状态安全可靠。

The real time construction monitoring on the embankment slope is critical to the embankment slope stability during the constriction.An embankment slope in Longnan Expressway Project was real-time monitored with various geotechnical instruments.The slope inclinometers were mounted at the top of a retaining wall so that the displacement at the toe of the embankment as well as the lateral movement of the embankment could be measured.The deep settlement benchmarks,piezometers and rainfall gauges were installed at the site so that the groundwater level and precipitation at the site could also be monitored.The results indicate that,the embankment slope lateral deformation during the highway operation varied from 6 to 11 mm,the deflection in the vertical directions varied from 3 to 10 mm.and no obvious trend with time was developed.The deep settlement benchmarks measured deflections were reasonable and no obvious trend was identified.The rainfall range was between 0 and 25 mm.There were no obvious groundwater changes found.It is therefore concluded that the embankment slope is stable.