岩体结构面是处置库中核素迁移的关键通道，也是各种岩体质量评价的重要指标。鉴于高放废物处置库工程的安全等级、服务年限及围岩体力学特征，在深入分析传统的岩体质量评价方法及节理和断层等结构面对处置库安全性、可靠性产生的重要影响的基础上，建立一种基于多维度、多尺度结构面综合指标SCE的岩体质量评价方法。以中国高放废物处置库天湖地段岩体地表结构面调查和钻孔数据为依据，采用SCE指标对天湖岩体质量进行评价。实例分析表明：该指标克服了传统的单一指标对岩体结构面评价的不足，可以更便捷、准确、客观地体现结构面发育程度及岩体完整性，与现实情况更为符合。研究结果既可为处置库设计中的渗流特性和核素迁移规律研究提供科学、合理的依据，也可为建立一套适用于高放废物处置库场址筛选和适宜性评价体系提供一定参考。

In high-level radioactive waste (HLW) disposal engineering, structure in rock mass is a key parameters in rock mass quality assessment which may provide potential pathway for nuclide migration. Under the consideration of the great importance of joints on the long-term safety requirements for HLW disposal, a multi-dimension and multi-scale comprehensive index-SCE is proposed to conduct rock mass quality assessment. The index-SCE is applied to assess the quality of Tianhu rock mass, the pre-selected area of high radioactive waste repository using the structure date from borehole and outcrop. Results show that the SCE is more effective than conventional rock mass assessment method (single parameter method). The research could provide scientific understanding for quality assessment of rock mass, which help understand more properties such as the permeability of rock mass and the migration of nuclide. In a word, this index will provide meaningful reference for site selection and quality assessment for high-radioactive waste repository.