Optimization Analysis of Shallow Tunnel Excavation

Abstract:

In this paper, FLAC^3D, the general software for geotechnical engineering project, is used to conduct two-dimensional numerical simulation for typical shallow tunnel excavation methods which include full-section method, the upper and lower step method, three-step method and CRD method etc.Effects of different excavation methods to the stability of tunnel surrounding rock are analyzed. The paper selected a subsistent tunnel as the research object. With construction simulation of different excavation methods, the paper makes comparative analysis of laws and characteristics of displacement of tunnel surrounding rock , stress distribution and size of plastic zones under different excavation methods. Study shows that: Ι.Followed by two step method, CRD engineering method and the full-section method successively, the three-step method is the best in the aspect of control of surrounding rock stress,; ΙΙ. Followed by full-section method, two- step method and the three step method successively, CRD engineering method is the best,in the aspect of size of plastic zones; Ш. Followed by three-step method, two-step method and the full-section method, CRD construction is the best in the aspect of control of surrounding rock displacement.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 3599-3605
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.3599
• Online since: May 2011
• Authors: Yao Qiang Zhao, Yuan Hai Li, Qing Fang Liu
• Keywords: FLAC-3D, Rock Displacement, Shallow Tunnel Construction Method (STCM), Surrounding Rock Stress, Tunnel

References

[1] QI Lan,CHEN Yong,ZHANG Liang,et al.Project optimization of superficial layer shading excavation of large-span diversion calvert through speedway[J].Rock and Soil Mechanics,2008,29(2):545-548. (in Chinese)

[2] WANG Meng-shu.Outline of TunnelConstruction bymeans of Method of Undercutting with Shallow Overburden[J].Tunnel Construction,2006(5):1-4. (in Chinese)

[3] WANG Zhansheng,ZHANG Dingli.KEY Techniques on shallow embedded tunnel constructed beneath exIsting subwsy tunn[J]. Chinese Journal of Rock Mechanics and Engineering,2007 (Supp.2):4208~4214. (in Chinese)

[4] ZHANG Chengping,ZHANG Dingli,WANG Mengshu. Analysis of ground subsidence induced by shallow-buried tunnel construction and its control techniques[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(Supp.2):3601-3608.

[5] ZHAO Jing,GONG Baoxing. Excavation Technology of Shallow Tunnelwith Long-span and Flat-top in Quicksand Stratum[J]. Tunnel Construction, 2008,28(5):613-615. (in Chinese)

[6] CUI Ying-zhe,DANG Hong-zhang,DAIXun-xue.Construction of Tunnel in CompactWater-rich Sand-pebble Ground by means of Shallow UndercuttingMethod[J].Tunnel Construction,2007 (3):92-96.

[7] WANG Zhi-da,GONG Xiao-nan,CAI Zhi-jun. Research on calculation method of digging length in tunnel with underground excavation under shallow cover[J]. Rock and Soil Mechanics, 2007,28(Supp):497-500. (in Chinese)

[8] JI Xiao-ming,ZHANG Xuan-bing,BAI Shi-wei.Simulation study of excavation process of shallow embedded tunnel for metro[J]. Rock and Soil Mechanics,2002,23(6):828~830. (in Chinese)

[9] ZHANG Jianguo,WANG Mingnian,LIU Dagang,et al.Comparison of different working procedures by CRD method for Shallow-buried subsea Tunnel excavation[J]. Chinese Journal of Rock Mechanics and Engineering,2007,26(Supp.2):3639 -3645.