Influences of soil disintegration in water on slope stability
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摘要: 库岸边坡失稳会对库区人民的生命财产造成巨大损失。水库滑坡不仅发生水位骤降时期,在水库蓄水水位上升时期,边坡同样会发生滑坡。从土体在水中崩解性状的角度探究水位上升期边坡滑坡机理。进行了相同体积不同底面边长（直径）的棱柱体和圆柱体试样在水中的崩解试验,以及4种不同含砂率圆柱试样在水中的崩解试验。结果表明：相同体积试样,比表面积越大,崩解速度越快；试样在水中的位置越深,试样崩解时间越短；随着试样含砂率的增大,试样崩解速度越来越快。土质边坡含砂率越大,越易失稳破坏。Abstract: The instability of the bank slope of the reservoir will cause great loss to the life and property of the people in the reservoir area. The landslide of the reservoir occurs in the periods of rapid falling and rising water level. The mechanism of slope landslide in the rising stage of water level is studied from the perspective of soil disintegration in water. A series of experiments on the disintegration of prisms and cylinders with the same volume and different bottom side lengths (diameters) are carried out. The disintegration tests on four kinds of cylinder samples with different sand contents in water are conducted. The results show that the larger the specific surface area of the same shape sample is, the faster the disintegration speed is. The deeper the water depth is, the shorter the disintegration time is. With the increase of the sand content, the disintegration rate of the soil sample is faster and faster. The larger the sand content of soil slope is, the more likely it is to be unstable.
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图 3 不同水深相同体积试样崩解时程曲线
Figure 3. Disintegration curves of soil samples with same volume at different water depths
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图 4 相同水深不同外形试样崩解时程曲线（水深30 cm）
Figure 4. Disintegration curves of soil samples with same water depth and different shapes（-30 cm）
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图 5 相同水深不同直径试样崩解时程曲线
Figure 5. Disintegration curves of soil samples with same water depth and different diameters
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图 6 不同含砂率试样崩解时程曲线
Figure 6. Disintegration curves of soil samples with different sand contents
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图 7 不同含砂率试样第40 s时崩解图
Figure 7. Collapse of samples with different sand contents at 40 s
表 1 下蜀土的基本物理指标
Table 1 Basic physical indexes of soil sample
名称 含水率w/% 重度 /(kN·m-3) 颗粒相对质量密度 Gs 塑限 wP /% 液限 wL /% 塑性指数IP 下蜀黄土 23.7 19.9 2.73 19.2 34.8 15.6 
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