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2007•Chinese Journal of Underground Space and EngineeringRequires access

Three-dimensional Modelling of Tunnel Excavation in Soft Rock

Xie Xiong-yao

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Abstract

For tunneling in soft rock,the main problems are the evaluation and the control of deformations and stability of the excavation front,loads and stresses in the lining.Thus,in this paper,a 3D finite element model is applied to simulate the conventional procedure of tunnel excavation and lining.A number of Finite Element Method analyses were conducted to investigate the effects of the factors,such as distance between tunnel face and support,partial-face excavation and closure of invert,on the deformation of surrounding mass in soft rock.The results proved that the tunnel support lining is the most relevant single factor analyzed in reducing induced settlements.When the bench method is adopted in soft rock,the bench length should not be too long.

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What this paper is about

For tunneling in soft rock,the main problems are the evaluation and the control of deformations and stability of the excavation front,loads and stresses in the lining.Thus,in this paper,a 3D finite element model is applied to simulate the conventional procedure of tunnel excavation and lining.A number of Finite Element Method analyses were conducted to investigate the effects of the factors,such as distance between tunnel face and support,partial-face excavation and closure of invert,on the deformation of surrounding mass in soft rock.The results proved that the tunnel support lining is the most relevant single factor analyzed in reducing induced settlements.When the bench method is adopted in soft rock,the bench length should not be too long.

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Available abstract

For tunneling in soft rock,the main problems are the evaluation and the control of deformations and stability of the excavation front,loads and stresses in the lining.Thus,in this paper,a 3D finite element model is applied to simulate the conventional procedure of tunnel excavation and lining.A number of Finite Element Method analyses were conducted to investigate the effects of the factors,such as distance between tunnel face and support,partial-face excavation and closure of invert,on the deformation of surrounding mass in soft rock.The results proved that the tunnel support lining is the most relevant single factor analyzed in reducing induced settlements.When the bench method is adopted in soft rock,the bench length should not be too long.

Key concepts: Excavation, Geotechnical engineering, Rock mass classification, Closure (psychology), Finite element method, Deformation (meteorology), Engineering, Geology

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