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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摘要高放废弃物在地质处置库中会长期衰变释热，引起缓冲回填材料性能降低。向膨润土主料中添加石英砂，能够显著提高导热性能，改善缓冲回填材料的热劣化。选用高庙子钠基膨润土(GMZ001)为主料，添加不同比例石英砂，压制成不同含水率、不同干密度试样。利用Hot Disk TPS2500s热常数分析仪测量，分析掺砂率、含水率和干密度对导热性能的影响，探讨混合型缓冲回填材料导热系数的理论预测问题。试验数据表明，随着干密度增大，导热系数显著增大，且含水率越高增幅越明显；干密度相同时，随掺砂率的增大试样导热系数增大；同一掺砂率条件下，导热系数随着含水率增大显著增大；热扩散系数与导热系数变化趋势基本一致。引入经典热阻理论，改进膨润土导热系数计算公式，对膨润土–砂混合物导热系数进行预测；将预测值与实测值进行比较，讨论预测理论的适用性。

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	陈航1
	张虎元2
	郭永强2
	闫铭1
	陈晓宁1

关键词 ：高放废物；缓冲回填材料；膨润土&ndash, 砂混合物；导热性能；理论预测

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

引用本文:

陈航1，张虎元2，郭永强2，闫铭1，陈晓宁1. 混合型缓冲回填材料导热性能测试与预测研究[J]. 岩石力学与工程学报, 2014, 33(S2): 4312-4320.
CHEN Hang1，ZHANG Huyuan2，GUO Yongqiang2，YAN Ming1，CHEN Xiaoning1. MEASUREMENT AND PREDICTION OF THERMAL PROPERTIES OF BENTONITE-SAND MIXTURES AS BUFFER BACKFILLING MATERIALS FOR HIGH LEVEL RADIOACTIVE WASTE. , 2014, 33(S2): 4312-4320.

链接本文:

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

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