New Tunnel Measurement Method Based on Cross Traverse Network
Cross traverse network is a common type of control network in tunnel. It has the characteristics of high accuracy and good reliability,but it has some problems such as high measurement workload and poor accuracy of joint adjustment of edge and angle meas-urements. On the basis of analyzing the influence of cross traverse network distance measurement and angle measurement on the joint adjustment accuracy,a new method of cross traverse measurement based on cross traverse network is put forward in combination with engineering practice,namely unilateral distance measurement cross traverse method. This method avoids the problems of unsatisfactory joint adjustment accuracy caused by the mismatching of edge angle accuracy of cross wire network,relative distortion of edge and angle measurement network and inaccurate weight determination in distance measurement. Simulation results show that the proposed method is closer to the real values than the traditional method. Engineering practice shows that,compared with the traditional method,the horizontal holing through accuracy and holing through azimuth accuracy are improved by 51.5％ and 9.8％ respectively,and the net-work measurement workload is reduced by about 30％.
tunnel control measurementcross traverse networkholing through erroraccuracyreliability
万方数据
维普
