地下水封洞库岩体渗透系数估算研究

HYDRAULIC CONDUCTIVITY ESTIMATION OF ROCK MASS IN WATER SEALED UNDERGROUND STORAGE CAVERNS

在分析现有主要岩体渗透系数估算模型适宜性的基础上,根据地下水封洞库区岩体渗透性特征,依据烟台LPG洞库岩体渗透系数测试数据,以岩石质量指标(RQD)、岩体完整性指标(RID)、裂隙宽度指标(AD)、岩石渗透性指标(LPD)为建模指标,建立地下水封洞库岩体渗透系数估算模型——RMP模型,并采用该RMP模型估算青岛地下水封洞库区14个钻孔277段岩体的渗透系数。研究结果表明,青岛地下水封洞库岩体渗透系数空间分布随机性较大,其中57.04%的渗透系数集中于10-4 m/d≤K<10-3 m/d的区间内。研究成果对地下水封洞库工程的水幕系统设计和水封效果评价具有一定理论意义和工程参考价值。

After the suitability of some previous model for estimating hydraulic conductivity of rock mass,a new model was proposed considering the hydraulic characteristic of water sealed underground storage caverns. Four geological parameters including rock quality designation（RQD）,rock mass integrity designation（RID）,aperture designation（AD）,and lithology permeability designation（LPD） were adopted for establishing the estimated RMP model according to the double packers test data of Yantai LPG underground storage caverns. Then the hydraulic conductivity of 277 sections of rock mass of 14 boreholes in the area of Qingdao water sealed underground sto-rage caverns were estimated by the RMP model. The results indicate that the rock mass in the study area has much randomness of spatial distribution;and 57.04%of the conductivity are between 10-4 m/d and10-3 m/d. The study result has some theoretical significance and engineering value for water curtain system design and evaluating wa-ter sealed effectiveness.