铁路隧道洞内CPⅡ导线测量与复测精度指标合理性探讨

在铁路隧道洞内精密平面控制网CPⅡ建立、复测过程中,因规范规定的往返观测平距较差限值、导线复测水平角较差限差及边长较差限差指标过严,致使规范不能严格有效执行。以某线3座新建隧道工程的洞内CPⅡ控制网建立与复测为基础,对实测数据进行较差统计,对规范中现行测量限差匹配合理性进行分析,提出更加合理可行、安全可靠的限差指标建议,达到既能保证控制网测量质量,又减轻施测单位测量工作量的目的,供将来规范修订时参考。

Discussion on Rationality of Precision Criterions for CPⅡ Traverse Survey and Resurvey inside Railway Tunnels

In the process of establishing and resurveying the CPII precise horizontal control network inside railway tunnels, some criterions in survey standard code usually cannot be complied with effectively,because these criterions in survey standard code are too strict,including the tolerance of tofro observed horizontal distance discrepancy, the tolerance of traverse resurvey horizontal angle discrepancy,and the tolerance of side length discrepancy. For this reason,in this paper,based on the establishment and resurvey of CPII control network of three newly-built railway tunnels,the discrepancies of measured data were analyzed statistically,and also the rationality of the precision tolerance criterions in current survey standard code was analyzed. Finally,this paper made a suggestion on a set of new precision tolerance criterions,which are more rational and feasible,more safe and reliable. With abovementioned new precision tolerance criterions,not only the survey quality of control network can be ensured,but also the survey workload of survey firm can be lessened. This research can serve as reference for revising the survey standard code in future.