基于正交试验的隧道开挖面位移释放分析
发布时间：2019-03-13 09:02
【摘要】：针对目前关于位移释放系数的计算方法比较复杂的问题,基于二次回归正交组合试验设计方法,提出了位移释放系数公式构建方法,应用该方法对静水应力场中圆形隧道进行了一系列数值试验,建立了考虑多个因素的开挖面位移释放系数拟合公式,比较了各影响因素的敏感性大小.通过数值算例和工程实例分析,初步验证了该方法的有效性.研究结果表明:对于不同级别岩体,同一因素对开挖面位移释放系数的影响程度不一;地应力水平、岩体扰动、地质强度指标、H-B常数和泊松比对开挖面位移释放系数的影响较大,而岩石单轴抗压强度和变形模量影响较小.
[Abstract]:In view of the complicated calculation method of displacement release coefficient at present, based on quadratic regression orthogonal combination test design method, the formula construction method of displacement release coefficient is put forward. A series of numerical tests of circular tunnel in hydrostatic stress field are carried out by using this method. A fitting formula of displacement release coefficient of excavation surface considering several factors is established and the sensitivity of each influencing factor is compared. Numerical examples and engineering examples show the effectiveness of the proposed method. The results show that for different grades of rock mass, the influence of the same factor on displacement release coefficient of excavation surface is different. The in-situ stress level, rock mass disturbance, geological strength index, H _ (B) constant and Poisson's ratio have great influence on displacement release coefficient of excavation surface, while uniaxial compressive strength and deformation modulus of rock have little effect.
【作者单位】： 湖南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51578232,51378195)~~
【分类号】：U451.5
，
本文编号：2439255
[Abstract]:In view of the complicated calculation method of displacement release coefficient at present, based on quadratic regression orthogonal combination test design method, the formula construction method of displacement release coefficient is put forward. A series of numerical tests of circular tunnel in hydrostatic stress field are carried out by using this method. A fitting formula of displacement release coefficient of excavation surface considering several factors is established and the sensitivity of each influencing factor is compared. Numerical examples and engineering examples show the effectiveness of the proposed method. The results show that for different grades of rock mass, the influence of the same factor on displacement release coefficient of excavation surface is different. The in-situ stress level, rock mass disturbance, geological strength index, H _ (B) constant and Poisson's ratio have great influence on displacement release coefficient of excavation surface, while uniaxial compressive strength and deformation modulus of rock have little effect.
【作者单位】： 湖南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51578232,51378195)~~
【分类号】：U451.5
，
本文编号：2439255
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