自由设站在沉降观测中的应用  

Application of free station leveling in the settlement monitoring

作　　者：卢安毅 贾玉安[1] 

机构地区：[1]安徽省地勘局第一水文工程地质勘查院,安徽蚌埠233000

出　　处：《工程勘察》2013年第4期82-84,共3页Geotechnical Investigation & Surveying

摘　　要：普通水准测量中要求前后视距近似相等,但在沉降观测中,监测点密集,如何让每个观测点视距与水准路线视距近似相等,成为测量的一大难题,如果不顾及前后视距差,采用自由设站观测监测点,监测点的观测值势必会受到i角的影响,加之施测场地变动较大,一般均要建地下车库,地下车库的分期开挖使得观测线路和测站很难固定,因此必需对观测值加上i角改正数。本文就结合天宝DINI03采用单程双测站的水准测量观测方式在沉降观测测量中,i角对中间点高程的影响及改正方法进行分析论述,并用实践证明其方法的可行性。Precise leveling generally requires equal distance between foresight and backsight,but in the settlement monitoring observation,there are intensive monitoring points,it is difficult to satisfy the equal distant requirement.If we disregard the equal distant requirement with free station leveling,observation values of monitoring point will be affected by the i-angle error.In this paper,by using Trimble DINI03,a one-way double station leveling observation method is proposed and the i-angle error is corrected.The practice has proved that the method is feasible.

关 键 词：沉降观测 天宝DINI03 单程双测站 i角的影响 

分 类 号：TU198[建筑科学—建筑理论]