分段式活动觇牌法配合正倒垂组监测长距离大坝技术

Technology of Monitoring Long-distance Dam by Segmental Moving Target Method Combined with Forward and Reverse Pendulum Group

大坝坝顶水平位移监测一般采用固定端点的活动觇牌法或小角度法,但对于长距离大坝却存在视距远、误差大的弊端。为此,该文提出了一种采用分段式活动觇牌法配合正倒垂组的监测方法,通过缩短观测视线长度,确定视准线设站点的绝对位移,提高了坝顶水平位移监测点的监测精度,并结合实例定性验证了该方法的可行性。

The moving target method with fixed end point or small angle method are usually used to monitor the horizontal displacement of dam crest,but for the long-distance dam,there are disadvantages of long sight distance and large error.So,a monitoring method is proposed in this paper,which uses the segmented moving target method combined with the forward and reverse pendulum group.By shortening the length of observation sight line and determining the absolute displacement of the sight line of setting station,the monitoring accuracy of the horizontal displacement monitoring point on the dam crest is improved,and the feasibility of the method is verified qualitatively by example.