龙江水电站坝后厂房高边坡锚杆应力分析

Analysis of anchor bar stress for high slopes of powerhouse at dam toe of Longjiang hydropower plant

为监测龙江水电站坝后厂房高边坡施工期及运行初期岩体锚固效果,在重点断面安装了锚杆应力计,同时建立各锚杆应力测点的多元线性回归统计模型,定量分析了边坡开挖高程、温度、时效等因子对高边坡锚杆应力的影响效应,可快速分析锚杆应力的主要成因,有效判断边坡稳定状态。分析结果表明,龙江水电站坝后厂房高边坡安全性态基本正常,但局部岩体存在轻微滑移趋势,建议加强对这些部位的监测。

In order to monitor the anchoring effect of a powerhouse at the dam toe of the Longjiang hydropower plant during the construction and initial operation periods, anchor bar stress meters were installed in several high slope sections. Multiple linear regression statistical models were established to quantitatively analyze the effects of slope excavation elevation, temperature, aging and other factors. The models is able to rapidly reveal the major causes of anchor bar stress and effectively judge the high slope stability conditions. The analysis indicates that the safety performance of high slopes of the powerhouse at the dam toe of the Longjiang hydropower plant is essentially normal, and there exist a slight slip trend of local rock. The authors therefore suggest that the safety monitoring should be strengthened in these locations.