混合型缓冲回填材料导热性能测试与预测研究

doi:10.13722/j.cnki.jrme.2014.s2.115

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Abstract In geological repository，high level radioactive waste(HLW) will decay and release heat to the buffer backfilling materials in the long time. Thermal property of bentonite buffer can be significantly improved by addition of sand so as to avoid thermal degradation of buffer backfilling materials. In this paper，mixtures of GMZ001 bentonite as major ingredient and quartz sand as an additive were compacted to measure the thermal data by Hot Disk TPS2500s Thermal Constants Analyzer. The effects of dry density，sand ratio and water content on the thermal property of the mixture were analyzed，and theoretical predictions of thermal conductivity were discussed. Test results show that thermal conductivity of the mixtures increases with the increase in dry density and sand ratio，respectively，especially at higher water contents. The thermal diffusivity of the mixtures is found to have a similar variation tendency to thermal conductivity. From the classic thermal resistance theory，calculation formulas for thermal conductivity of pure bentonite are adopted to predict the thermal conductivity of bentonite-sand mixtures. By comparison between predicted and measured values，the applicability of prediction theory is discussed.

Key words： high level radioactive waste(HLW) buffer backfilling materials bentonite-sand mixtures thermal property theoretical prediction

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	Articles by authors
	CHEN Hang1
	ZHANG Huyuan2
	GUO Yongqiang2
	YAN Ming1
	CHEN Xiaoning1

Cite this article:

CHEN Hang1,ZHANG Huyuan2,GUO Yongqiang2, et al. MEASUREMENT AND PREDICTION OF THERMAL PROPERTIES OF BENTONITE-SAND MIXTURES AS BUFFER BACKFILLING MATERIALS FOR HIGH LEVEL RADIOACTIVE WASTE[J]. , 2014, 33(S2): 4312-4320.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.s2.115 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS2/4312

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