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over-excavation forecast of underground opening by using Bayes discriminant analysis method

Journal of Central South University of Technology 2008年第4期15卷 498-502页

作者：宫凤强李夕兵张伟 School of Resources and Safety Engineering Central South University Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines Changsha 410083China

A method to forecast the over-excavation of underground opening by using the Bayes discriminant analysis(BDA)theory was *** Bayes discriminant analysis theory was *** on an engineering example,the factors influencing the over-excavation of underground opening were taken into account to build a forecast BDA model,and the prior information about over-excavation of underground opening was also taken into *** parameters influencing the over-excavation of opening,including 2 groups of joints,1 group of layer surface,extension and space between structure faces were selected as geometric *** data in an underground opening were used as the training *** cross-validation method was introduced to verify the stability of BDA model and the ratio of mistake-discrimination was equal to zero after the BDA model was *** in an underground engineering were used to test the discriminant ability of BDA *** results show that five forecast results are identical with the actual situation and BDA can be used in practical engineering.

关键词： underground opening over-excavation Bayes discriminant analysis forecast

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Modified ground response curve(GRC)in strain-softening rock mass based on the generalized Zhang-Zhu strength criterion considering over-excavation

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Underground Space 2021年第5期6卷 585-602页

作者： Chen Xu Caichu Xia Changling Han Institute of Rock Mechanics Ningbo UniversityNingboZhejiangChina Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghaiChina CCCC First Highway Consultants Co. LtdXi’anShaanxiChina

The ground response curve(GRC)depicts the relationship between support reaction force and ground displacement,which improves the understanding of ground-support interaction and provides important references to the tunnel ***,it is difficult to anticipate the tunneling-induced large deformation with sufficient reliability in soft rock with high geostress since the small strain theory is not *** large deformation occurs,the tunnel needs to be ***,the GRC should be modified considering the enlarged excavation radius since the actual excavation radius is usually greater than the designed *** overcome the shortcomings of small strain theory in recognizing ground-support interaction under large deformation circumstances,a new large strain numerical approach for modifying the GRC was proposed considering over-excavation in strain-softening rock masses based on the generalized Zhang-Zhu strength criterion.A case study was conducted based on the Lianchengshan tunnel in *** modified GRC was employed to investigate the ground-support behavior for different support schemes and to explore the applicability of the stress release *** with field tests,the proposed approach was *** comparing with GRCs proposed by previous work,the present modified GRC was proved to be superior to *** studies were conducted and it is found that over-excavation,for example,reserving a very large clearance between the surrounding rock and the support,is necessary to reduce ground pressure to a large *** yielding supports which can provide high support pressure during the process of deformation are highly recommended when tunneling in high geostress ***,if the initial geostress is not very high,it is not necessary to pursue unwarranted overexcavation since the ground pressure applied on the support is mainly the loosening stress when the deformation is *** support stiffness should be provi

关键词： Ground response curve Large strain over-excavation Strain-softening Soft rock tunnel

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