精密三角测量在地铁施工监测中的应用

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在地铁施工监测中采用一种免测仪器高和棱镜高的短视距精密三角高程观测地表沉降的测量方法。经理论分析和实际应用验证,其精度较高,可以满足施工监测的需要。用此方法对地铁车站施工进行沉降观测,共观测16期,各期环闭合差均高于二等水准要求,平差后的高程中误差均小于1mm,且各测点变形情况与地铁车站开挖施工情况吻合。
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