Study of Measurement and Distribution Characteristics of Surrounding Rock Stress of Large Crosssectional Highspeed Railway Tunnel with Mechanized Construction

doi:10.3973/j.issn.2096-4498.2018.08.006

Tunnel Construction ›› 2018, Vol. 38 ›› Issue (8): 1303-1310.DOI: 10.3973/j.issn.2096-4498.2018.08.006

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Study of Measurement and Distribution Characteristics of Surrounding Rock Stress of Large Crosssectional Highspeed Railway Tunnel with Mechanized Construction

YU Li^{1, 2}, WANG Zhilong^{1, 2}, YANG Nie^{1, 2}

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

Received:2018-04-16 Revised:2018-07-08 Online:2018-08-20 Published:2018-09-04

Abstract

Abstract:

A large amount of field measurement on surrounding rock stress of tunnel group on Hubei Section of ZhengzhouWanzhou Highspeed Railway with mechanized construction are carried out to learn the variation laws and distribution characteristics of surrounding rock stress of large crosssectional highspeed railway tunnel with mechanized construction. And then the surrounding rock stress variation laws and distribution characteristics of surrounding rock stress in Grade Ⅳ and Grade Ⅴ deepburied conditions are analyzed and compared with standard loads based on measurement results. The study results show that: (1)The stabilizing time of surrounding rock stress starts on the 21st to the 27th day. (2)The measured surrounding rock stress is less than the calculated load of deepburied tunnel in related railway design codes. (3)Under the condition of Grade Ⅳ depth, the lateral pressure coefficient is 1.2-2.4 times that of standard load. (4)Under the condition of Grade Ⅴ depth, the lateral pressure coefficient is 0.86-1.43 times that of standard load.

Key words: large crosssectional tunnel, mechanized construction, surrounding rock stress, lateral pressure coefficient, monitoring and measurement

CLC Number:

U 451+.2

YU Li, WANG Zhilong, YANG Nie. Study of Measurement and Distribution Characteristics of Surrounding Rock Stress of Large Crosssectional Highspeed Railway Tunnel with Mechanized Construction[J]. Tunnel Construction, 2018, 38(8): 1303-1310.

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Study of Measurement and Distribution Characteristics of Surrounding Rock Stress of Large Crosssectional Highspeed Railway Tunnel with Mechanized Construction

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