| 中间设站三角高程测量在隧道拱顶沉降监测中的应用研究 |
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| 引用本文： | 周韬,刘成,周刚.中间设站三角高程测量在隧道拱顶沉降监测中的应用研究[J].测绘与空间地理信息,2022,45(1):182-185,188. |
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| 作者姓名： | 周韬 刘成 周刚 |
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| 作者单位： | 中国有色金属长沙勘察设计研究院有限公司,湖南长沙 410000 |
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| 摘 要： | 推导了中间设站三角高程测量的数学模型及其误差公式,分析了使用不同精度仪器观测所能达到的精度,结果表明:采用测角精度0.5 s,测距精度0.6 mm+1 ppm的仪器,各观测量单测回观测进行中间设站三角高程拱顶沉降监测,在不利的观测条件下(α=30°),前后视长度240 m以内,该方法所测高差的精度小于1 mm;采用测角精度1 s,测距精度1 mm+1 ppm的仪器,前后视长度100 m以内,该方法所测高差的精度小于1 mm,能满足《城市轨道交通工程测量规范》中对拱顶沉降监测的精度要求。长沙地铁5号线拱顶沉降监测实例表明:全站仪中间设站监测拱顶沉降方法简单、精度高、便于施行、工作量小,值得推广。
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| 关 键 词： | 中间设站 三角高程测量 拱顶沉降 变形监测 |
Research on the Application of Trigonometric Leveling with Intermediate Stations on the Settlement Monitoring of Tunnel Vault |
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| ZHOU Tao,LIU Cheng,ZHOU Gang.Research on the Application of Trigonometric Leveling with Intermediate Stations on the Settlement Monitoring of Tunnel Vault[J].Geomatics & Spatial Information Technology,2022,45(1):182-185,188. |
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| Authors: | ZHOU Tao LIU Cheng ZHOU Gang |
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| Institution: | (China Nonferrous Metal Changsha Survey and Design Institute Co.,Ltd.,Changsha 410000,China) |
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| Abstract: | The mathematical model and error formula of trigonometric leveling with intermediate stations are derived,the measurement accuracy differences of different instruments are analyzed,the results show:under unfavorable observation conditions withαequal to 30°,all the observations proceed in single observation set,the accuracy of the height difference measured by this method is less than 1 mm in the condition of front and rear view length less than 240 m,by using instrument with angle measurement accuracy of 0.5″and ranging accuracy of 0.6 mm+1 ppm;the accuracy of the height difference measured by this method is less than 1 mm in the condition of front and rear view length less than 100 m,by using instrument of angle measurement accuracy of 1″and ranging accuracy of 1 mm+1 ppm.According to"Code for urban rail transit engineering survey",it can meet the accuracy requirements of settlement monitoring of tunnel vault.The example of vault settlement monitoring of Changsha Metro Line 5 shows that the method is simple,accurate,and easy to implement,which is worth popularizing. |
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| Keywords: | set up intermediate stations trigonometric leveling tunnel vault settlement deformation monitoring |
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