Study of Formation Mechanism of Unknown Gas in a Tunnel on SichuanTibet Railway

doi:10.3973/j.issn.2096-4498.2018.01.008

Tunnel Construction ›› 2018, Vol. 38 ›› Issue (1): 65-71.DOI: 10.3973/j.issn.2096-4498.2018.01.008

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Study of Formation Mechanism of Unknown Gas in a Tunnel on SichuanTibet Railway

WANG Xu¹, ZHAO Qihua^{1, 2,*}, DENG Qing¹, LIANG Yufei¹

（1. College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China）

Received:2017-06-17 Revised:2017-09-01 Online:2018-01-20 Published:2018-02-01

Abstract

Abstract:

In order to learn the formation mechanism and developing characteristics of unknown gas in a tunnel on SichuanTibet Railway and to find a new method for study of unknown gas, the study methods for engineering geology and geochemistry are analyzed. The unknown gas, the mixed gas, is identified according to sample test, allweather monitoring data and study of the formation mechanism and developing characteristics of the unknown gas. And then, the possible migration of the unknown gas from other regions is eliminated according to the study of engineering geology, the distributions and geological structures of gas resources and coalbearing strata and rock fissure developing conditions. Finally, the laboratory test and geochemical analysis are carried out on rock sample, which demonstrate the organic and inorganic formation mechanisms, small storage and the autochthonous generation of the unknown gas. The study can provide reference for followed successful construction of the tunnel.

Key words: SichuanTibet railway, tunnel, unknown gas, organic formation mechanism, inorganic formation mechanism

CLC Number:

U 45

WANG Xu, ZHAO Qihua, DENG Qing, LIANG Yufei. Study of Formation Mechanism of Unknown Gas in a Tunnel on SichuanTibet Railway[J]. Tunnel Construction, 2018, 38(1): 65-71.

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Study of Formation Mechanism of Unknown Gas in a Tunnel on SichuanTibet Railway

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