第 25 卷第 4 期岩石力学与工程学报 Vo l .2 5 N 2006 年 4 月 Chinese Journal of Rock Mechanics and Engineering April 2006
PHYSICAL PROPERTY OF CHINA′′′S BUFFER MATERIAL FOR HIGH-LEVEL RADIOACTIVE WASTE REPOSITORIES
WEN Zhijian (Beijing Research Institute of Uranium Geology China National Nuclear Corporation Beijing 100029 China)
Abstract The deep geological disposal is regarded as the most reasonable and effective way to safely dispose high-level radioactive wastes(HLW) in the world. The conceptual model of HLW geological disposal in China is based on a multi-barrier system bines an isolating geological environment with an engineered barrier system including the vitrified HLW, canister, overpack and buffer/backfill material. The bentonite is selected as base material of the buffer/backfill material in HLW repositories due to the very low permeability and excellent retardation of nuclides from migration etc. GMZ deposit is selected as the candidate supplier for buffer material of HLW repositories in China. Since 2000 systematic study was conducted on GMZ–1 that is Na-bentonite produced from GMZ deposit and selected as reference material for Chinese buffer material study. The position basic parameters of GMZ–1 bentonite and thermal conductivity hydraulic conductivity pression strength as function of dry density and water content a
