为了评价洞库水幕系统密封效果,进行了水幕系统效率试验,通过水幕孔在不同水动力状态下的压力变化情况判断其效率值的高低,进而在低效率岩体区域增加水幕孔来改善岩体连通性和渗透性,提升水幕效率值。讨论了水幕系统水平水幕孔效率试验中关键参数临界压力值的求解方法,并以烟台某地下洞库水平水幕孔效率试验为例,应用该方法求解的临界压力值对水幕效率进行判断。试验结果证明,该临界压力值的求解方法有一定可行性,能够准确判断需要补孔的区域,进而显著提升该区域的水幕系统效率值;岩体渗透性与水幕效率关系密切,一般情况下,满足洞室密封要求的岩体的渗透系数在10^-7～10^<sup>-5 m/s 范围内;文中临界压力值的求取是在一定假设基础之上完成,在实际工程中还需要进一步完善。

In order to evaluate the tightness of water-sealed underground storage cavern, we carried out test on the efficiency of water curtain system. According to the pressure values of water boreholes at different hydrodynamic levels, we estimated the efficiency of water curtain system, and then by drilling new boreholes in low efficiency area, we could improve the connectivity and permeability of rock mass. Furthermore we present a method of calculating the key parameter, namely critical pressure value, and applied the method to calculate the critical pressure value of a water-sealed underground storage cavern in Yantai as an example. Test results proved that the method of calculating the critical pressure value is feasible. According to the calculated critical pressure value, we can accurately determine the rock area which needs more boreholes. Moreover, rock permeability is closely related with the efficiency of water curtain. In most cases, rock permeability ranging from 10^-7m/s to 10^-5m/s could meet the cavern’s tightness requirements. The process of obtaining the critical pressure value in this research is based on assumptions and needs further improvement in engineering practice.