Formation mechanisms of different kinds of blast-induced cracks and their extension characteristics in rock mass

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-09-13 DOI:10.1016/j.compgeo.2024.106747

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Abstract

Different kinds of cracks, including radial cracks, circumferential cracks, and spalling cracks, are formed in rock blasting. Understanding the extension characteristics of these cracks is essential for improving rock fragmentation results. However, few publications have comprehensively focused on various blast-induced cracks, and their formation mechanisms and extension characteristics are still unclear. In this study, the formation mechanisms of different kinds of blast-induced cracks are theoretically analyzed from the viewpoint of inner and outer blasting effects. Numerical models are subsequently developed to study the extension characteristics of different kinds of blast-induced cracks. Finally, based on the tunnel blasting excavation, the extension of cracks induced by cutting and surrounding blastholes is numerically simulated. The results show that rock blasting can be classified into inner and outer blasting effects. Under the inner blasting effect, radial cracks are formed in various stress states, with circumferential cracks occurring specifically in the tensile-tensile state. Under the outer blasting effect, spalling cracks form around the free surface of rock mass. In brittle rocks subjected to blast loading with higher peak values, circumferential cracks occur more frequently. In practice, it is advisable to improve rock fragmentation results by adjusting the formation of different kinds of blast-induced cracks.

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岩体中不同类型爆破诱发裂缝的形成机理及其扩展特征

在岩石爆破中会形成不同种类的裂缝，包括径向裂缝、周向裂缝和剥落裂缝。了解这些裂缝的扩展特征对于改善岩石破碎效果至关重要。然而，很少有文献全面关注各种爆破引起的裂缝，其形成机制和扩展特征仍不明确。本研究从爆破内效应和爆破外效应的角度，对各种爆破诱发裂缝的形成机理进行了理论分析。随后建立了数值模型来研究不同类型爆破诱发裂缝的扩展特征。最后，以隧道爆破开挖为基础，对切割和周边爆破引起的裂缝扩展进行了数值模拟。结果表明，岩石爆破可分为内爆破效应和外爆破效应。在内层爆破效应下，径向裂缝在各种应力状态下都会形成，周向裂缝主要出现在拉伸-拉伸状态下。在外爆破效应下，岩体自由表面周围会出现剥落裂缝。在峰值较高的爆破荷载作用下，脆性岩石更容易出现周向裂缝。在实践中，最好通过调整不同类型爆破引起的裂缝的形成来改善岩石破碎效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.