EFFECT OF SLAKING ON THE ENGINEERING BEHAVIOUR OF THE CRUSHED MUDSTONES
EFFECT OF SLAKING ON THE ENGINEERING BEHAVIOUR OF THE CRUSHED MUDSTONES
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发表时间：
2013
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影响因子：
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通讯作者：
K. Sharma;T. Kiyota;H. Kyokawa
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作者：
K. Sharma;T. Kiyota;H. Kyokawa
在不同类型的软沉积岩中，泥岩对循环湿润和干燥（称为熟化）敏感，即使在一个湿润和干燥循环之后也会导致显着的物理降解。为了考察碎泥岩的熟化对工程行为的影响，利用改进的直剪装置模拟不同应力条件下的循环润湿和干燥，对碎泥岩进行了一系列直剪试验。值得注意的是，第一次润湿时的蠕变剪切变形随着应力比的增加而变大，而随着循环润湿和干燥的进行而减小。在干燥过程中，最初，在较高的含水量下没有发现明显的蠕变变形。当试件含水量达到2.5%左右时，随着失水，垂直变形和剪切变形逐渐发生。随着循环次数的增加，观察到峰值摩擦角逐渐减小。
Among the different types of soft sedimentary rocks, mudstones is sensitive against to cyclic wetting and drying known as slaking, leading to significant physical degradation even after one cycle of wetting and drying. In order to examine slaking effects on engineering behaviour of crushed mudstone, a series of direct shear tests were conducted on the crushed mudstone by simulating cyclic wetting and drying under different stress conditions by using a modified direct shear apparatus. It is noted that the creep shear deformation in the first wetting becomes larger as increase in the stress ratio, while it decreases with the progress of cyclic wetting and drying. During the drying process, initially, no appreciable creep deformation is found to occur at higher water content. When the water content of specimen has reached about 2.5 %, both vertical and shear deformations occur progressively with water loss. A gradual decrease of the peak angle of friction is observed with the increasing number of cycles.