应用三维激光扫描技术判定围岩稳定性试验研究

为验证采用隧道断面面积变形率判定围岩稳定性方法的工程可行性,依托某在建隧道工程进行三维激光扫描和常规监控量测的现场测试,获取监测断面的面积变形和特征点收敛数据,并对数据进行分析。研究结果表明:三维激光扫描的隧道断面变化率趋势能较好地反映隧道围岩稳定性状态;对比两种方法所得到的监测断面特征点部位的收敛曲线,可知其趋势一致、数量级接近。研究结果验证了三维激光扫描用于隧道监控量测及围岩稳定性判识的可行性,并且三维激光扫描所得到的隧道断面变化趋势信息更为丰富。

Experimental Study on Application of Three-dimensional Laser Scanning Technology to Determine Surrounding Rock Stability

In order to verify the engineering feasibility of the method of determining the stability of surrounding rock by the area deformation rate of tunnel section,field tests of three-dimensional laser scanning and conventional monitoring measurement are carried out in a tunnel under construction.The area deformation and characteristic convergence data of monitoring section are obtained,and the data are analyzed.The results show that the trend of change rate of tunnel section indicated by three-dimensional laser scanning can better reflect the stability state of tunnel surrounding rock.By comparing the convergence curves of characteristic points of monitoring section obtained by the two methods,it can be seen that the trends are identical and the orders of magnitude are close.The research results validate the feasibility of three-dimensional laser scanning in tunnel monitoring measurement and surrounding rock stability identification,and the information of tunnel section change trend obtained by three-dimensional laser scanning is more abundant.