Ultrasonic experiment and mechanical properties of rock and soil mixture under triaxial deformation

Ultrasonic experiment and mechanical properties of rock and soil mixture under triaxial deformation
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三轴变形下岩土混合体超声试验及力学特性

DOI:
10.1007/s12517-019-4933-8
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发表时间:
2019-12
影响因子:
--
通讯作者:
Qin Xiaotong
Qin Xiaotong
中科院分区:
地球科学4区
文献类型:
--
作者:
Cui Kai;Qin Xiaotong

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本文对岩土混合料三轴变形的实时超声试验和力学特性进行了研究。岩石块度(RBP)和围压对RSM的力学和超声性能有显着的影响。RSM的结构控制机制实质上是土基质与岩块之间的相互作用。试验结果表明,在相同压实度的情况下,随着RBP的增加,RSM的峰值强度增大。应力跳跃是变形过程中的一种特殊现象,随着RBP的增加,这种现象变得更加明显。此外,作用在试样上的围压对应力跳跃的产生也起着重要作用。不同含岩率的试件均以剪切和鼓包相结合的方式破坏,且随着试件中岩块数量的增加,宏观裂纹数量也随之增加。在较低的RBP下,破坏机制主要由剪切破坏模式控制;在较高的RBP下,破坏机制主要由膨胀破坏控制。
In this paper, the author discussed the real-time ultrasonic experiment and mechanical properties of rock and soil mixture (RSM) in three-axis deformation. Both rock block percentages (RBPs) and confining pressure have a significant influence on the mechanical and ultrasonic properties of RSM. The structure control mechanism of RSM is essentially the interactions between the soil matrix and rock blocks. The experiment result shows that with the increase of RBP, the peak strength of RSM increases when the soil matrix has the same compactness. Stress skip is a special phenomenon during the deformation; this phenomenon becomes obvious with increasing RBP. In addition, the confining pressures acted on the specimens also play an important role in generating stress skip. Specimens with different rock percentage failed by a combination of shear and bulging failures, and the number of macrocracks increases with the increase of rock blocks in RSM specimens. At lower RBP, failure mechanism is dominantly controlled by shear failure pattern; at higher RBP, failure mechanism is primary controlled by bulging failure.
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