Study of Mechanical Properties of Interaction between Surrounding Rock and Supporting Structure of ZhengzhouWanzhou Highspeed Railway Tunnel Constructed by Fullsection Method with Largescale Machinery

doi:10.3973/j.issn.2096-4498.2018.08.008

Tunnel Construction ›› 2018, Vol. 38 ›› Issue (8): 1316-1323.DOI: 10.3973/j.issn.2096-4498.2018.08.008

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Study of Mechanical Properties of Interaction between Surrounding Rock and Supporting Structure of ZhengzhouWanzhou Highspeed Railway Tunnel Constructed by Fullsection Method with Largescale Machinery

YU Li^{1, 2}, CAI Minjin^{1, 2, *}

(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)

Received:2018-05-02 Revised:2018-06-29 Online:2018-08-20 Published:2018-09-04

Abstract

Abstract:

The distribution characteristics of surrounding rock pressure of tunnels on ZhengzhouWanzhou Highspeed Railway constructed by bench method and fullsection method with largescale machinery are determined based on monitoring data. And then the finite element model of surrounding rocksupporting structure is established by numerical simulation to analyze the influence of the construction methods on surrounding rock pressure and internal force of the structure. The results show that: (1) The bench method would easily lead to the voids between supporting structures and surrounding rocks due to multiple construction times; while the fullsection method with largescale machinery disturbs surrounding rock little, and the primary support closure is rapid, which can ensure good tightness between primary support and surrounding rock. (2) In soft surrounding rock, the fullsection method with largescale machinery is superior to bench method in improving the structure stress, reducing the degree of eccentricity and compression inside the structure, and giving full play to the bearing capacity of the arch tunnel structure. (3) The fullsection method with largescale machinery has comprehensive advantages in rapid construction of weak surrounding rock, deformation control of supporting structure and safety guarantee of supporting structure.

Key words: ZhengzhouWanzhou highspeed railway tunnel, fullsection method with largecale machinery, bench method, surrounding rock and supporting structure, field monitoring, numerical simulation

CLC Number:

U 455

YU Li, CAI Minjin. Study of Mechanical Properties of Interaction between Surrounding Rock and Supporting Structure of ZhengzhouWanzhou Highspeed Railway Tunnel Constructed by Fullsection Method with Largescale Machinery[J]. Tunnel Construction, 2018, 38(8): 1316-1323.

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Study of Mechanical Properties of Interaction between Surrounding Rock and Supporting Structure of ZhengzhouWanzhou Highspeed Railway Tunnel Constructed by Fullsection Method with Largescale Machinery

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