基于Ventsim的地下水封洞库建造期通风方式优选

Optimization of ventilation mode during construction of large water curtain grotto storage based on Ventsim

针对某大型地下水封洞库施工期间通风方式选择问题,依托某大型地下水封洞库通风设计,在分别比较抽出式、压入式、混合式通风方式优缺点的基础上,按照各通风方式进行风量计算,分别确定大型地下水封洞库各阶段施工的通风方式;构建某大型地下水封洞库的通风Ventsim数值仿真模型,数值模拟研究不同施工阶段下不同通风方式、风流在大型地下水封洞库的动态演化规律,并对各不同施工阶段下不同通风方式的通风效果进行对比分析,优选不同施工阶段通风方式。数值模拟结果表明,第一施工阶段最优的通风方式为压入式通风,第二施工阶段最优的通风方式为混合式通风,第三和第四施工阶段最优的通风方式为抽出式通风。验证不同施工阶段各通风方式的风阻、风量和最佳风网效率,为大型地下水封洞库施工期的通风设计提供科学依据。

Aiming at the selection of ventilation modes during the construction of a large underground cavern storage,according to the ventilation design of a large underground cavern storage,on the basis of comparing the advantages and disadvantages of the extraction type,the press-in type and the mixed type ventilation mode,and according to each ventilation mode calculate the air volume according to the method was calculated,and the ventilation mode of each stage of the construction of the large underground cavern storage was determined.A Ventsim numerical simulation model for ventilation of a large underground cavern storage was constructed,and numerical simulations were conducted to study the dynamic evolution law of wind flow in a large underground cavern storage with different ventilation modes in different construction stages,and the differences in different construction stages were analyzed.The ventilation effects of the ventilation methods were compared and analyzed,and the ventilation methods in different construction stages were optimized.The numerical simulation results showed that the optimal ventilation mode in the first construction stage was press-in ventilation,the optimal ventilation mode in the second construction stage was mixed ventilation,and the opti-mal ventilation mode in the third and fourth construction stages were extraction ventilation.At the same time,it was verified that the effect of wind resistance,air volume and air network efficiency of each ventilation method in different construction stages was optimal,which provided a scientific basis for the ventilation design of large underground watersealed caverns during the construction period.