摘要
清江隔河岩水库库岸滑坡体监测网设计中 ,首先要确定必要的观测精度 ,监测网、监测点的设计原则及具体观测方案。通过收集分析国内外有关资料 ,现场踏勘与专家评判后 ,定为该水库库岸重要滑坡体的必要变形观测精度为 :监测网点坐标中误差为± 2～ 3mm ,滑坡体上监测点位移量中误差为±3～ 5mm。监测网是监测滑坡体变形的依据 ,监测网点的数量不宜多 ,但必须能控制整个滑坡范围。监测点是滑坡体的代表 ,监测点点位的移动 ,必须能够代表该处滑坡体的移动。监测网观测方法采用建立三维网来满足三维坐标精度要求。监测点水平位移观测方法选择以角后方交会法为主的联合交会法作为主要观测方法。监测点垂直位移观测方法是在比高不大的测区 ,可采用精密水准测量法 ,在比高较大的测区可采用测距高程导线法 ,有时也可联合使用。通过对滑动体多年变形监测数据的综合分析 ,达到了对滑坡体的安全性提供预报的目的。
In the design of the reservoir bank landslide monitoring net for Geheyan reservoir on Qingjiang river,through collecting and analyzing related information at home and abroad,field investigation and expert judgment,the necessary deformation accuracies for important landslide masses of the reservoir are determined:the error of the coordinates of the monitoring net points is ±(2～3) mm;the median error of the displacement of the monitoring points on landslide masses is ±(3～5) mm.The monitoring net is the basis of monitoring the deformation of landslide masses.The monitoring net points should not be too many,but should be enongh to control the whole range of the landslide.The monitoring points are the representatives of the landslide massess,so the movement of the monitoring point must be able to represent the movement of the landslide mass at the point.A three dimensional net is established to satisfy the accuracy requirement for three dimensional coordinates.A combined intersecting method,with the backward intersecting as the main method,is selected to observe the horizontal displacement of the monitoring points.The accurate level survey method is used to observe the vertical displacement in zones with specific height not too great,and the distance and elevation measuring traversing method is adopted in zones with greater specific height,and sometimes the two methods can be used in combination with each other.Through comprehensive analysis of observed data of the landslide masses' deformation in several years,the goal to predict the safety of landslide masses is achieved.
出处
《人民长江》
北大核心
1999年第9期41-43,共3页
Yangtze River
关键词
滑坡监测
变形观测
库岸
观测设计
水电站
Slide monitoring Deformation observation Reservoir bank Instrumentation design Geheyan Hydropower Station
