Study on Gas Hazard Assessment of Yangshan Tunnel on Inner MongoliaJiangxi Railway
(1 Institute of Architectural Engineering, Zhengzhou Shengda University of Economics, Business＆Management, Xinzheng 451191;2 School of Safety Engineering, Henan University of Engineering, Xinzheng 451191; 3 No. 2 Engineering Corporation Limited of China Railway 20th Bureau, Beijing 100142)
Abstract：
Gas emission occurred many times at the pondings of some sections after excavation of invert arch of Yangshan tunnel on Inner Mongolia- Jiangxi railway, threatening the tunnel construction to a large extent. In order to determine the gas grade of Yangshan tunnel, gas occurrence laws of coal measures and shallow oil and gas reservoirs in tunnel work area were studied, and the gas hazard of coal measures and shallow oil and gas reservoirs was evaluated by an identification method for gas burst hazard and drill-hole based gas volume model. The results show that the disclosed coal seam of tunnel work area is located at gas weathering zone and there is no risk of gas burst;the main source of tunnel gas is the Yanchang 1 oil and gas reservoir below the tunnel base, gas emits through tectonic fracture zone or joint fissure zone, the maximum gas emission at work face is 0.23 m3/min, so this is a tunnel with low gas.
CEN Peishan1 TIAN Kunyun2 WANG Ximin3
.Study on Gas Hazard Assessment of Yangshan Tunnel on Inner MongoliaJiangxi Railway[J] MODERN TUNNELLING TECHNOLOGY, 2019,V56(4): 43-49
2019, Vol. 56 