大断面地下洞室收敛监测技术的改进与应用

通过分析各种收敛测量技术及其局限，提出了传统钢尺收敛测量技术的改进方案。给出了一种新型收敛测桩的结构及其安装操作方法，该新方案具有操作难度低、测量速度快、不影响测量精度等优点，能够实现10 m以上测距的收敛测量。据此提出了适用于大断面隧洞和大跨度地下洞室的收敛测量布置方案，同时给出了实际测量成果，证明新型收敛测桩能够满足测量精度要求。

Improvement and application of convergence monitoring technology of underground cavern with large cross section

Through the analysis of the convergence monitoring technology and its limitations, the improvement of the traditional measurement technology by extensometer was put forward. A new convergence monitoring pile is introduced and so are the structure, installation and operation method, the new scheme has the advantages of convenient operation, quick measuring and high measurement precision. The monitoring of the convergence of above 10 m measurement distance can be realized. Accordingly, we put forward the convergence measurement scheme for the tunnel with large section and underground cavern with large span, and obtain the actual measurement results, which prove that the new convergence monitoring pile can meet the requirements of measurement accuracy.