珊溪水电站大坝变形监测中的若干问题

珊溪水电站大坝变形监测项目包括近坝区高程控制网和平面边角控制网、大坝视准线及沉陷观测。经分析，近坝区高程控制网和平面控制网、大坝沉陷观测系统测点布置合理、监测精度高，能满足大坝安全监测要求；而大坝视准线监测精度偏低，必须采取选择有利监测时间、定期检校仪器、改善监测方法等措施，从而达到有效监测大坝水平位移的目的。

Several problems of deformation monitoring on the Dam of Shanxi Hydropower Station

The deformation monitoring items of the dam for Shanxi Hydropower Station include the elevation control network close to the dam area, plane control network of triangulation and trilateral, dam collimation line and settlement monitoring. According to the analysis, the measurement points of the elevation control network close to the dam area, plane control network and dam settlement monitoring system are arranged reasonably and its monitoring accuracy is high, which can meet the needs of dam safety monitoring. But the monitoring accuracy of dam collimation line is on low side, so that some measures such as selecting the favorable monitoring time, regular checking devices and improving monitoring methods in order to reach the goal of effective monitoring the dam horizontal displacement.