隧洞控制测量中免棱镜全站仪测量方向与结构面夹角的限差分析

准确获取隧洞岩体结构面的几何信息对于隧洞的稳定性评价至关重要。研究区位于长春市净月潭吉林大学岩体力学隧洞实习基地。应用免棱镜全站仪进行岩体隧洞的控制测量,按照测量工作中"先控制后碎部"的基本原则,进行全站仪棱镜模式下的导线测量及在各导线点上极坐标法免棱镜模式的岩体结构面控制点测量;通过对同测站及异测站相同结构面控制点坐标数据的对比分析,探讨免棱镜全站仪测量方向与岩体结构面夹角的限差。研究表明:在隧洞控制测量中,免棱镜全站仪测量方向与结构面间夹角大于30°是准确获取岩体目标控制点坐标的必要条件之一。

Tolerance analysis of angle between reflectorless total station measuring direction and structure plane in tunnel control survey

It is critical for the stability evaluation of tunnel to obtain accurate tunnel rock structure plane geo- metric information． In this paper，the study area is located in the Moon Lake of Changchun，rock mechanics prac- tice base tunnel of Jilin University． According to the basic principle of measuring work “scattered after the first control” ，we applied reflectorless total station to make control measurement of rock tunnel，and carried on traverse survey of total station prism mode and rock structure plane control points measurement using polar coordinate meth- od of total station without prism mode in each traverse point． Through the comparison and analysis of control point coordinate data of the same structure plane on the same and different station，the authors discussed the tolerance of the angle between reflectless total station measuring direction and structure plane． The results shows that the angle between reflectless total station measuring direction and structure plane is greater than 30 degrees is one of the nec- essary conditions for obtaining accurate rock target control point coordinate in the tunnel control measurement．