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Mechanical behavior of intermittent jointed rocks under random cyclic compression with different loading parameters

机译：不同载荷参数下随机节理的节理节理力学特性

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摘要

Rock engineering structures are likely to be subjected to random cyclic loading resulting from earthquakes during their service lives. Characterizing the mechanical behavior of rocks under random cyclic compression is thus essential, especially for the intermittent jointed rocks widely existing in various engineering structures. This study experimentally investigates the fatigue mechanical response of synthetic intermittent jointed rocks subject to different random cyclic compression, regarding four loading amplitudes and four loading durations. Our results report the influence of the two loading parameters on the mechanical behavior of synthetic jointed rocks, involving the strength and deformation characteristics, the fatigue damage evolution and the progressive failure behavior. Both the fatigue strength and the deformation modulus of jointed samples decrease with increasing loading duration, while they exhibit opposite variation with increasing loading amplitude. The hysteresis loops can be observed in the stress-strain curves of jointed samples under various random cyclic loading, and the irreversible plastic strain exists in each hysteresis loop; this irreversible strain develops in a two-stage manner with increasing cycle number. Under higher loading amplitude or duration, the synthetic jointed rock is characterized by higher cumulative fatigue damage. The fatigue failure modes of jointed samples are independent of random cyclic loading, and the tensile splitting failure is dominate in all the recovered jointed samples. Five crack coalescence patterns are observed in the present study based on the interaction between two adjacent joints, and the progressive failure process of tested jointed sample is captured via a high resolution industrial camera. The surface cracks always initiate from the joint tips, and then propagate at a certain angle with the intermittent joints towards to the maximum compression direction.
机译：岩石工程结构在使用寿命期间可能会遭受地震引起的随机循环载荷。因此，表征随机循环压缩下岩石的力学行为至关重要，特别是对于各种工程结构中广泛存在的断续节理岩石而言。这项研究实验研究了合成间歇节理岩石在不同的随机循环压缩作用下的疲劳力学响应，涉及四个加载幅度和四个加载持续时间。我们的结果报告了两个载荷参数对合成节理岩力学性能的影响，包括强度和变形特性，疲劳损伤演化和渐进破坏行为。接头样品的疲劳强度和变形模量均随载荷持续时间的增加而降低，而随载荷振幅的增加而呈现相反的变化。在各种随机循环载荷作用下，接缝样品的应力-应变曲线中都可以观察到磁滞回线，每个磁滞回线中都存在不可逆的塑性应变。随着循环次数的增加，这种不可逆的应变以两阶段的方式发展。在较高的载荷振幅或持续时间下，合成节理岩的特征在于较高的累积疲劳损伤。节理样品的疲劳破坏模式与随机循环载荷无关，拉伸断裂破坏在所有回收的节理样品中占主导地位。在本研究中，基于两个相邻接缝之间的相互作用，观察到五个裂纹合并模式，并通过高分辨率工业相机捕获了被接缝样品的渐进破坏过程。表面裂纹总是从接缝尖端开始，然后与断续缝以一定角度向最大压缩方向传播。

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