长大隧道洞内CPII混合导线网适应性分析

Adaptability analysis of CPⅡmixed traverse network in long tunnel

由于隧道洞内条件的限制或工程建设中的特殊要求,洞内导线布设常有短边。针对隧道洞内线路平面控制网(CPII)导线测量固定测站(传统导线网)构网中短边测量不满足精度指标的问题,本文提出利用固定测站和自由测站边角交会相结合的平面混合导线网方法进行隧道洞内CPII导线测量,通过误差分析,对比各种网形,验证洞内CPII混合导线网的适应性。实验结果表明,混合导线网能够满足工程需求,混合测站导线测量方法可解决隧道短边测量的难题,对类似项目具有借鉴意义。

Due to the limitation of conditions in tunnel or special requirements in engineering construction,there are often short edges in the layout of traverse in the tunnel.In response to the problem that the short edge of CPII traverse survey fixed station(traditional traverse network)does not meet the accuracy index in tunnel,this paper proposes a planar mixed traverse network method that combines the intersection of the fixed station and free station corner rendezvous for CPII traverse survey in the tunnel.By error analysis and comparison of various network shapes,the adaptability of CPII mixed traverse network in the tunnel is verified.The example results show that the mixed traverse network can meet engineering requirements,and the mixed station traverse survey method can solve the problem of tunnel short edge survey,which has reference significance for similar projects.