母线洞对地下洞室群施工期风流行为的影响研究

基于CFD技术，采用标准k-ε湍流模型，分别建立地下洞室群风流场单相流模型和CO扩散混合模型。对施工期通风风流行为进行三维数值模拟，分析了母线洞贯通前后主厂房的风流场分布和厂房内不同位置CO浓度分布随时间的变化趋势。结果表明：母线洞贯通后使得主厂房内低速涡旋区增大，造成厂房底部施工工作面附近风流场紊乱，在工作面附近区域形成污染物滞留区。这易导致主厂房和主变室之间形成污风循环，对安全施工造成影响。

Study on impact from busbar tunnel on behavior of air flow during construction of underground cavern group

Based on CFD technology， a single phase flow model and a hybrid CO diffusion model are respectively established in accordance with the standard k-ε turbulence model. Thereafter， a 3-D numerical simulation is made on the behavior of the air flow of ventilation during the construction and then the time-dependent changing trends of both the air-flowing field distribution of the main powerhouse and the CO concentration distribution inside of the powerhouse before and after the break-through of the busbar tunnel are analyzed. The result shows that the low-velocity eddy region in the main powerhouse is to be enlarged after the break-through of the busbar tunnel， which causes the turbulence of the air-flowing field near the working face of the construction at the bottom of the powerhouse， and then creates a pollutant stagnant zone near the working face. This is prone to result in the circulation of the polluted air between both the main powerhouse and main transformer chamber and impacts the safety of the construction as well.