软土地基隧道沉降规律的初步分析

隧道沉降观测是隧道运营管理维修养护的基本工作内容之一,沉降观测数据可作为隧道维护的基础依据资料。本文简要介绍了隧道沉降监测的施测方法,结合某越江隧道沉降监测实例,对长期运营隧道的沉降观测数据进行分析,绘制了隧道整体纵向沉降形态曲线,以得到隧道整体的沉降规律;计算隧道纵向沉降曲线的曲率变化,以得到隧道差异沉降的发展态势。分析表明,该隧道经多年运营,沉降已基本趋于稳定,但不均匀沉降还在继续发展。文中对纵向不均匀沉降的影响因素进行了初步探讨。

This paper introduces Monitoring Network of tunnel settlement and location of settlement monitoring points' and monitoring executing step,analysis theory and method of tunnel settlement long-term monitoring data is discussed.The method is applied to the settlement monitoring analysis of some tunnel crossing the river.In the case study,the unitary settlement is researched by means of longitude settlement curves.The rules of the main points' settlement varying from time are discussed.Then the curvature of longitude curves has been calculated for research the uneven settlement.Finally,considering settlement,geology and historic deformation which influence tunnel structural mechanical properties,the dangerous mechanical range of stress concentration is conjectured.Therefore the basis of analyzing tunnel structural mechanical performance,of evaluating tunnel safety and serviceability,of establishing tunnel maintenance theory has been provided in this paper.