粘弹性动态增量反演分析在隧道施工中的应用

Application of Viscoelastic Staged Incremental Back Analysis in Tunnel Construction

摘要:

对深圳莲盐高速公路隧道围岩中的凝灰熔岩进行了流变试验,得到了围岩的流变模型；结合隧道的施工过程,根据围岩的收敛变形和拱顶下沉,采用改进的自适应遗传算法对粘弹性位移进行优化反分析,并利用反演得到的围岩参数,如弹性模量、粘滞系数等对变形进行预测.研究表明,利用试验得到的围岩流变模型,结合隧道施工过程的动态增量反演分析,可以较好地模拟围岩的实际性态,对指导施工具有重要意义.

Abstract:

Based on the rheology experiment on tufflava on tunnel of Lianyan expressway of Shenzhen and the analysis of test results as well as the model identification,a rheology model was proposed.Based on the measured convergence displacement and vault settlement,physical parameters such as elastic modules and creep coefficients were obtained by viscoelasticity incremental back analysis with adaptive genetic algorithm,which were used to predict deformation of surrounding rock.Research results show that mechanical property of surrounding rock can be simulated reasonably with viscoelasticity increment at back analysis with staged construction to predict deformation,which is very important to tunnel construction.