[Objective]Displacement equivalence method is an equivalent circle method that is widely used in engineering prac-tice.In order to further explore the engineering effect of this method in predicting broken rock zone thickness under deep non-uni-form stress field,and to establish the equivalent circle radius calculation formula with engineering applicability.[Methods]The straight-wall semicircular arch section often used in deep tunnels was selected as the research object,and according to the basic principle of displacement equivalence method,the equivocal circle radius functional relationship equation was established under the conditions of lateral pressure coefficient λ of 1.1～1.5 and span-to-height ratio b0/h of 1.3～1.5 by using a combination of numerical simulation of FLAC3D and theoretical calculations,and was applied to predict broken rock zone thickness of the sur-rounding rocks of the water silo of a coal mine in Qujiang,Jiangxi Province.Thickness prediction.[Results]The result show that:according to the equivalent circle formula,broken rock zone of the water chamber peripheral rock has a thickness of 1.41 m in the longitudinal axis and 1.2 m in the transverse axis,which is elliptical;the measured broken rock zone is also elliptical,with an average value of(1.15～1.45)m,of which the maximum value is 1.45 m in the longitudinal axis,and the minimum is 1.15 m in the transverse axis.the theoretical prediction is in line with the measured value.[Conclusion]The result show that:the displacement method is suitable for the prediction of broken rock zone thickness of the deep soft rock;the constructed equiva-lent circle radius formula has good engineering applicability,and it can provide a simplified and reference method and idea for the evaluation and prediction of the thickness of broken rock zone of the similar tunnel project.
关键词
隧洞/直墙半圆拱形/位移等代法/等效圆/围岩/变形/松动圈/数值模拟
Key words
arch deep tunnel/straight-wall semicircular arch/displacement equivalence method/equivalent circle/surrounding rock/deformation/broken rock zone/numerical simulation
维普
万方数据