矿区高压线塔基础沉降动态预计与监测

High-voltage Power Lines Pylons Foundation Subsidence Dynamic Prediction and Monitoring Method in Mining Area

为确保开采沉陷区高压线路正常运行,研究了某矿区高压线塔基础沉降预计和监测方法。首先基于概率积分法地表下沉动态预计原理,设计了高压线塔基础沉降动态预计方法,预计了不同时段输电线塔基础中心点的下沉值和倾斜值,并根据高压线路运行的相关规范,分析了高压线塔的安全等级;然后采用GPS-RTK技术对研究区高压线塔基础点进行了位移监测,并提出了一种基于平面拟合原理的高压线塔基础倾斜值计算方法;最后将高压线塔基础中心点的实测值(下沉值、倾斜值)与预计值(下沉值、倾斜值)进行对比,进一步分析了预计方法的可行性。试验结果表明:受GPS-RTK技术观测精度的影响,在下沉盆地中心附近高压线塔基础中心点的预计值(下沉值、倾斜值)与实测值(下沉值、倾斜值)较接近,而在下沉盆地边缘附近高压线塔基础中心点的预计值(下沉值、倾斜值)与实测值(下沉值、倾斜值)偏差较大,表明开采沉陷区高压线塔基础变形动态预计与监测方法切实可行,但在条件允许的情况下,建议采用精度优于RTK技术的方法对下沉盆地边缘附近的高压线塔进行变形监测。

The pylons foundation subsidence dynamic prediction and monitoring method in a mining area are studied. Firstly,based on the dynamic prediction principle of surface subsidence of probability integral theory,the high-voltage power lines pylons foundation subsidence dynamic prediction method is designed,the subsidence values and inclined values of the central points of the high-voltage power lines pylons foundation in different periods are predicted dynamically,based on some relative specifications of the operation of high-voltage power lines,the safety levels of the high-voltage power lines pylons are analyzed; then,the displacement of the basic points of the high-voltage power lines pylons in the research area are monitored by adopting GPS-RTK,the calculation method of the inclined values of high-voltage power lines pylons based on the principle of plane fitting is proposed; finally,the comparison of actual measures values（ subsidence values and inclined values） and prediction values are conducted to analyze the feasibility of the high-voltage power lines pylons foundation subsidence dynamic prediction method proposed in this paper. The experimental results show that the differences of the prediction values（ subsidence values and inclined values）of the high-voltage power line pylons that are located in the central area of the subsidence basin is small,on the contrary,the differences of the prediction values（ subsidence values and inclined values） of the high-voltage power lines pylons that are near the edge of the subsidence basin are obvious. The experimental results further indicated that the high-voltage power lines pylons foundation subsidence dynamic prediction and monitoring data processing method proposed in this paper is practicable,under the allowing conditions,it is suggested that the observation method which precision is higher than RTK can be used in the monitoring process of the high-voltage power lines pylons that are near the edge of the subsidence basin.