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首页> 外文会议>International symposium on unsaturated soil mechanics and deep geological nuclear waste disposal >EXPERIMENTAL RESULTS ON THE EFFECT OF TEMPERATURE ON THE HYDRO-MECHANICAL BEHAVIOUR OF BENTONITE
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EXPERIMENTAL RESULTS ON THE EFFECT OF TEMPERATURE ON THE HYDRO-MECHANICAL BEHAVIOUR OF BENTONITE

机译：实验结果对温度对膨润土水电机械行为的影响

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The bentonite barrier of underground repositories for high-level radioactive waste will be hydrated by the groundwater while it is subjected to high temperatures due to the radioactive decay of the wastes. These temperature changes affect the hydraulic and mechanical response of the bentonite, what has important implications on the design and performance of the repository. The experimental research reported in this paper is on the influence of temperature on the hydro-mechanical behaviour of bentonite, and has been carried out with the Spanish FEBEX bentonite compacted at dry densities expected in the repository (from 1.3 to 1.8 g/cm3). The dependence of the swelling strains of bentonite on temperature has been measured in the interval from 30 to 80°C. At high temperatures the swelling capacity of the clay slightly decreases. Also, a clear decrease of swelling pressure as a function of temperature was observed for the same dry densities. Nevertheless the deformation of bentonite is more dependent on the stress than on temperature. It has also been detected an increase with temperature in the water saturated permeability of bentonite. The retention curves of the bentonite compacted at different dry densities have been determined under isochoric conditions and in the range of temperatures between 20 and 120°C. For a given density and water content, suction decreases as temperature increases at a rate that is larger than the one predicted on the basis of the water surface tension change with temperature. Mechanisms related to the physicochemical interactions that take place at microscopic level-in particular the transfer of interlayer water to the macropores triggered by temperature-seem to explain qualitatively the experimental observations.
机译：地下储存库用于高放射性废物的膨润土屏障将由地下水而它经受高温，由于废物的放射性衰变被水合。这些温度变化影响膨润土，什么对仓库的设计和性能有重要影响的液压和机械响应。本文报道的实验研究是对膨润土的水力机械性能温度的影响，并已与西班牙FEBEX进行的预计，在仓库干密度的膨润土压实（从1.3到1.8克/立方厘米）。温度膨润土溶胀菌株的依赖已在间隔被测量为30至80℃。在高温下的粘土的溶胀容量稍微减小。此外，观察到相同的干密度膨胀压力的作为温度的函数的明显下降。尽管如此膨润土的变形更依赖于应力比在温度。还已经发现在膨润土水饱和渗透性的增加与温度。在不同的干密度压实膨润土的保留曲线已被等容条件下和在20和120℃之间的温度范围内确定的。对于给定的密度和含水量，抽吸如在比所述一个随温度的水的表面张力的变化的基础上预测的更大的速率温度升高而降低。涉及到发生在微观物理化学相互作用机制水平 - 尤其是层间水转移到由引发的大孔温度似乎定性解释了实验观察。

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