Study on deterioration mechanism of rock discontinuity under different dynamic disturbances

IF 2.3 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Granular Matter Pub Date : 2023-09-30 DOI:10.1007/s10035-023-01367-2

Jinhou Zhang, Bingli Gao

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Abstract

Dynamic disturbance is an essential factor leading to rock discontinuity’s deterioration and instability, which induces geological disasters such as collapses and landslides. To study the mechanical response characteristics and deterioration mechanism of rock discontinuity under different dynamic disturbances, the discrete element PFC is used to apply different waveform stress loads on the rock discontinuity with different roughness. The deterioration process of the structural plane is monitored and observed in real time to analyze the evolution of the deterioration process and the disaster mechanism of rock discontinuity under different dynamic disturbances. The results show that the peak shear stress of the structural plane under triangular wave disturbance is smaller than that under sine wave disturbance, and the difference is less than 1 MPa. With the increase in disturbance cycles, the loose degree of the strong force chain under sine wave disturbance is more significant, and the disturbance deterioration is more serious. The micro-cracks gradually develop and penetrate from the edge to the interior under sine wave disturbance and the opposite under triangular wave disturbance. Compared with the triangular wave disturbance, the crack growth rate is faster, the number of micro-cracks is higher, and the range is more extensive under sine wave disturbance, indicating it is more prone to deterioration.

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不同动力扰动下岩体结构面劣化机理研究

动力扰动是导致岩体结构面劣化和失稳的重要因素，从而诱发崩塌、滑坡等地质灾害。为研究不同动力扰动下岩体结构面的力学响应特征及劣化机制，采用离散元PFC对不同粗糙度的岩体结构面施加不同波形应力载荷。对结构面劣化过程进行实时监测和观测，分析不同动力扰动下结构面劣化过程的演化和岩体结构面破坏机理。结果表明:三角波扰动作用下结构面的峰值剪应力小于正弦波扰动作用下的峰值剪应力，且差值小于1 MPa;随着扰动周期的增加，正弦波扰动下强力链的松动程度越显著，扰动劣化越严重。微裂纹在正弦波扰动下由边缘向内部逐渐发展和渗透，而在三角波扰动下则相反。与三角波扰动相比，正弦波扰动下裂纹扩展速度更快，微裂纹数量更多，范围更广，表明其更容易变质。

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来源期刊

Granular Matter Materials Science-General Materials Science

CiteScore

4.60

自引率

8.30%

发文量

审稿时长

6 months

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.