绝对位移测量在隧道监控量测中的应用

The Application of Absolute Displacement Measurement in Tunnel Monitoring and Measurement

针对软弱围岩隧道特别是浅埋偏压、地层顺层的隧道,片理及节理裂隙发育,岩体破碎,开挖后由于应力重新分布,容易产生较大的下沉、收敛,甚至有可能会产生整体位移。常规采用的相对位移监控量测虽然能够监测出拱顶下沉量和周边收敛量,但无法监测出隧道整体位移情况。采用绝对位移监控量测能够准确监测出隧道偏移的方向和偏移量,为动态调整支护参数、及时采取有效的加固措施和合理预留变形量提供依据。

Aiming at weak surrounding rock tunnels, especially shallow buried biased, stratified bedding tunnels, the fracturing and joint fissures is developed, the rock mass is broken, due to the redistribution of stress after excavation, it is easy to produce large subsidence,convergence, and even there may be an overall displacement. Although the conventional relative displacement monitoring measurement can monitor the amount of subsidence of the vault and the surrounding convergence, it cannot monitor the overall displacement of the tunnel. The absolute displacement monitoring measurement can accurately monitor the direction and amount of tunnel excursion, can provide a basis for dynamically adjusting support parameters, timely taking effective reinforcement measures and reasonably reserving the amount of deformation.