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MODERN TUNNELLING TECHNOLOGY 2019, Vol. 56 Issue (3) :25-30    DOI:
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Characteristics Analysis and Forecast Evaluation of Gas Occurrence of the Longquanshan Tunnel on Chengdu Metro
(1 China Railway Eryuan Engineering Group Co., Ltd.，Chengdu 610031；2 China Railway Southwest Research Institute Co., Ltd.，Chengdu 611731)
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Abstract In light of the tunnel construction safety and gas fortification, the regional geological background and gas structure of the Longquan Mountain in Sichuan Basin were investigated from a macro perspective, the Longquanshan tunnel of Chengdu Metro was identified as a gas tunnel in non-coal measure strata considering the development and distribution of geological structure at tunnel site, and its macroscopic characteristics of gas structure were presented. Based on the detailed exploration results of gas detection, geophysical exploration and laboratory test of boreholes, the microscopic characteristics of gas buried depth, elevation, strata and rock mass of the Longquanshan tunnel were stated. By comparing with the Longquanshan water tunnel to be completed soon, the above mentioned characteristics were proved by gas monitoring results, and a prediction and evaluation of gas occurrence and fortification grade of the Longquanshan tunnel were conducted.
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ZHANG Xiaolin1 CAI Jianhua2 LIAO Yankai2
Keywords： Chengdu metro   Longquanshan tunnel   Gas occurrence；Concentration；Detection and monitoring；Fore? cast     
Abstract： In light of the tunnel construction safety and gas fortification, the regional geological background and gas structure of the Longquan Mountain in Sichuan Basin were investigated from a macro perspective, the Longquanshan tunnel of Chengdu Metro was identified as a gas tunnel in non-coal measure strata considering the development and distribution of geological structure at tunnel site, and its macroscopic characteristics of gas structure were presented. Based on the detailed exploration results of gas detection, geophysical exploration and laboratory test of boreholes, the microscopic characteristics of gas buried depth, elevation, strata and rock mass of the Longquanshan tunnel were stated. By comparing with the Longquanshan water tunnel to be completed soon, the above mentioned characteristics were proved by gas monitoring results, and a prediction and evaluation of gas occurrence and fortification grade of the Longquanshan tunnel were conducted.
Keywords： Chengdu metro,   Longquanshan tunnel,   Gas occurrence；Concentration；Detection and monitoring；Fore? cast     
Cite this article:   
ZHANG Xiaolin1 CAI Jianhua2 LIAO Yankai2 .Characteristics Analysis and Forecast Evaluation of Gas Occurrence of the Longquanshan Tunnel on Chengdu Metro[J]  MODERN TUNNELLING TECHNOLOGY, 2019,V56(3): 25-30
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