【作者】 刘月妙； 王驹； 蔡美峰； 谭国焕；

【Author】 LIU Yue-miao~(1,2),WANG Ju~1,CAI Mei-feng~2,THAM L.G.~3 (1.Beijing Research Institute of Uranium Geology,Beijing 100029,China; 2.Civil and Environmental Engineering School,University of Science and Technology Beijing,Beijing 100083,China; 3.Department of Civil Engineering,The University of Hong Kong,Hong Kong China)

【机构】 核工业北京地质研究院； 北京科技大学土木环境工程学院； 香港大学土木工程系；

【摘要】 岩石物理力学性能研究是高放废物处置库选址、设计、建造和运行过程中不可或缺的一个重要研究方面。经过全国筛选对比,已初步确定甘肃北山地区为我国高放废物处置库重点预选区。本文对甘肃北山深部完整岩石物理力学性能和高温长期性能进行了系统的研究。甘肃北山地区的深部主岩为似斑状二长花岗岩和英云闪长岩,似斑状二长花岗岩均匀性好,两种主岩均具有高密度、低孔隙率、高力学强度、低变形和高脆性的特性。当温度升高到90℃,似斑状二长花岗岩的长期强度比室温时大约降低10%;随着恒载应力的降低,似斑状二长花岗岩达到破坏的时间显著增长。围压对岩石的长期性能有着重要的影响,随着围压的增加,轴向蠕变变形量明显增加。在相同的应力比下,导致岩石断裂破坏的时间随着围压的减小而缩短。本次研究得到了甘肃北山深部完整岩石物理力学性能的定量化参数,为高放废物处置库场址选择和场址评价以及未来的地下实验室和处置库的设计和建造提供了必要的基本资料。更多还原

【Abstract】 The Beishan area,a Gobi desert in Gansu province,is considered as a suitable candidate for high-level radioactive waste(HLW) geological repository in China.The dominant lithology in Beishan area is porphyritic monzonitic granite,with coarse-grained pegamatite dikes distributed locally and tonalite enclaves or veins.The porphyritic monzonitic granite has high isotropic.The deep intact rock of Beishan area has low water content,low water sorption,low porosity,high unconfined compression strength,high shear strength,high tensile strength and low strain.Triaxial compression strength and strain of the rock increase rapidly as the confining pressure increase. The crack damage stress decrease with the temperature increased from room temperature to 90℃.The time to failure increases rapidly as the constant load decreases.At the same constant load,the time to failure reduces when the temperature increases.更多还原