The effect of moisture on compressional and shear wave speeds in unconsolidated granular material
The effect of moisture on compressional and shear wave speeds in unconsolidated granular material
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水分对松散颗粒材料中压缩波和剪切波速度的影响
DOI：
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发表时间：
2000
影响因子：
2.4
通讯作者：
Mark Wang
中科院分区：
文献类型：
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作者：
F. Douglas Shields;J. Sabatier;Mark Wang
测量了水蒸气对两种不同玻璃珠和渥太华沙中横波和纵波速度的影响。玻璃珠的标称直径为125微米，砂的标称直径为500微米。当水蒸气被缓慢地引入抽空的材料中时进行测量。由具有高浓度的钛和钡氧化物的玻璃制成的珠的蒸气压等温线通过简单的Brunauer-Emmett-Teller（BET）理论相当好地拟合。对于渥太华砂，如果假设颗粒的表面积是计算面积的三倍，假设所有颗粒都是直径为500微米的球体，则BET理论拟合蒸气压等温线。在这两种材料中，水蒸气对波的速度几乎没有影响。然而，对于由含有氧化钠的玻璃制成的珠粒，随着水蒸气的引入，波速度大约加倍，并且只有当饱和蒸气压被假定降低20%时，蒸气压等温线才具有BET形状。这些结果已经通过假设在石灰玻璃和水之间发生化学反应以形成凝胶来解释。
The effect of water vapor on the shear and compressional wave speeds in two different kinds of glass beads and in Ottawa sand has been measured. The nominal diameter of the glass beads was 125 microm and of the sand, 500 microm. Measurements were made as the water vapor was introduced slowly into the evacuated material. The vapor pressure isotherm for the beads made of glass with a high concentration of titanium and barium oxides was fit reasonably well by the simple Brunauer-Emmett-Teller (BET) theory. For the Ottawa sand, the BET theory fit the vapor pressure isotherm if the surface area of the grains was assumed to be three times the area calculated, assuming all of the grains were spheres with a diameter of 500 microm. In these two materials, the vapor had little effect on the wave speeds. For beads made of glass containing sodium oxide, however, the wave speeds approximately double with the introduction of water vapor, and the vapor pressure isotherm had the BET shape only if the saturated vapor pressure was assumed to be lowered by 20%. These results have been explained by assuming that a chemical reaction occurred between the lime glass and the water to form a gel.