Abstract：
Considering that gas bursts are very detrimental to tunnel construction, and using a railway tunnel with such a risk as an example, this paper discusses the failure mechanism and relevant prevention and control measures from the aspects of advance geological prediction, gas monitoring, construction ventilation and coal disclosing technology. Results show that: 1) gas burst—the result of multiple factors, including of the outburst of coal, rock, gas and stress field—is a complex dynamic phenomena, for which the elastic strain energy of the coal and rock and the internal energy of the gas are the bursting energies and the geostress mutation and construction disturbance are the incentives; 2) gas bursts are easily induced at the weak point or surface of the working face, especially during construction disturbances with poor prevention; 3) a comprehensive advance geological prediction system, dominated by advance horizontal drilling, deepened hole detection and gas measurement and various physical exploration methods, is an important means to prevent gas bursts; and 4) with the help of a safety standard management system, construction risks can be effectively avoided by adopting technical measures like gas emission, coal disclosing, construction ventilation and structural treatment.
2015, Vol. 52 