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《Journal of Beijing Jiaotong University》 2013-01
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Deformation mechanism of black batt with high stress in Baozhen tunnel

TIAN Siming1,2(1.Engineering Design and Appraisal Centre of Ministry of Railways,Beijing 100844,China;2.Economic and Planning Research Institute of the Ministry of Railways,Beijing 100038,China)  
Large amount of deformation,high deformation rate,long deformation duration and obvious dissymmetry and non-uniformity in space-time effect are primary characteristics of rock mass around Baozhen Tunnel for Yiwan Railway.Aiming at the problems occurring in construction of the tunnel,including large deformation of carbonaceous shale,distortion and fracture of surrounding rock and support structure,based on statistical analysis of field monitoring data and geological sketch of tunnel heading,deformation and failure mechanism of carbonaceous shale have been analyzed by engineering geology and structural mechanics,affection of rock stratification and soft interlayer on stability of surrounding rock has been discussed,deformation and failure mechanism of carbonaceous shale under high ground stress has been uncovered in the paper.The research results indicate that deformation and failure forms of carbonaceous shale around Baozhen Tunnel principally involve extrusion deformation along bedding,bending deformation of rock beam,rib fall,inbreak,bottom squeeze of muddy interlayer,deformation of sidewall provoked by weak interlayer.Deformation and failure characteristics principally include symbiosis,non-uniformity,zonation,dissymmetry,concentricity and domination of weak interlayer on large deformation.The deformation mechanism presents diversity,coexistence and reciprocal transformation.
【Fund】: 铁道部科技研究开发计划项目资助(2004G021-C);; 铁道部科技开发计划重大项目资助(2009G005 2011G019-A)
【CateGory Index】: U451.2
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