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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 Qinghe Geheyan reservoir bank landslide monitoring network, the necessary observation precision, monitoring network and monitoring points design principles and specific observation programs should be determined first. After collecting and analyzing relevant data both at home and abroad, the on-site reconnoitrement and expert judgment are the necessary deformation observation accuracies of the important landslide bodies on the reservoir banks as follows: the error of the monitoring network point coordinates is ± 2 ~ 3mm, the displacement of monitoring points on the landslide body The error is ± 3 ~ 5mm. Monitoring network is the basis for monitoring landslide deformation, monitoring the number of outlets is not more, but must be able to control the entire range of landslides. The monitoring point is a representative of the landslide body. The movement of the monitoring point point must be able to represent the movement of the landslide body there. Monitoring network observation method used to establish three-dimensional network to meet the accuracy requirements of three-dimensional coordinates. The method of observing the horizontal displacement of monitoring points is based on the method of joint rendezvous based on the angle of intersection method. Vertical displacement monitoring point monitoring method is less than the height of the test area, the use of precision leveling method can be used in the larger area than the elevation of lead wire method, and sometimes can be used in conjunction. Through the comprehensive analysis of the multi-year deformation monitoring data of the sliding body, the purpose of providing the prediction of the safety of the landslide body is achieved.