一种新的大跨度洞室收敛变形监测方法探索

摘要

地下洞室开挖后开挖面各点都会发生位移变化,尤以断面方向变形最为明显. 因此,及时监测断面收敛变形情况并预测变形趋势,对施工及工程安全具有重要意义. 探索了一种安全高效的大跨度洞室收敛变形监测方法. 详述了监测实施方案并对误差作了分析,进而提出了减小误差的措施. 该法弥补了传统监测方法在大跨度洞室收敛变形监测上的不足,可站立于地面操作,避免了高空作业,极大地提高了监测作业效率.%The deformation would occur at every points of a cavern after excavation, especially in the transversal direction. So, the timely monitoring on the convergence deformation of cavern and further prediction of the deformation trend is significant to the engineering safety. We put forward a safe and efficient measuring method for large-span cavern. The measuring scheme is dis-cussed and the error analysis is conducted to provide error-reducing measures. The new monitoring solution overcomes some de-ficiencies of traditional method for large-span cavern as it could be applied by engineers standing on ground, so as to avoid working high above the ground and increase the measuring efficiency.