岩石矿物学对顶板拉致破裂能量传递及岩爆影响的实验研究

IF 7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

International Journal of Rock Mechanics and Mining Sciences Pub Date : 2025-03-16 DOI:10.1016/j.ijrmms.2025.106087

Binwen Ma , Heping Xie , Xiufeng Zhang , Hongwei Zhou , Changtai Zhou , Wenbin Sun , Jianbo Zhu

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引用次数: 0

摘要

在煤矿井下开采过程中，硬顶板岩层拉伸破裂释放的弹性能部分传递给围岩，引起地压冲击。然而，岩石矿物学性质对传递能量和岩爆的影响尚未得到定量分析。本研究通过三点弯曲试验再现顶板岩层拉伸破裂过程，利用标定的声发射系统和数字图像相关（DIC）系统计算传递能量，即以声发射（AE）事件形式的辐射能量和破裂岩石的动能。定量分析了岩石胶结度、岩石粒度和矿物组成对能量传递的影响。在顶板岩层拉伸断裂过程中，硅质顶板岩层的能量传递比泥质顶板岩层高2 ~ 3个数量级。硅质地层的能量传递主要来源于断裂地层的动能，其能量比辐射能量高一个数量级。高动能归因于225米/秒的非常高的裂纹速度。由于局部微剪切破坏和岩石颗粒的剥离，能量传递主要来源于泥质地层的辐射能。能量传递随晶粒尺寸和脆性矿物的增大而增大。研究发现，相对于粒度和矿物成分，岩石胶结在岩石矿物学对能量传递和岩爆的影响中起着举足轻重的作用。脆性硅质胶结地层的拉伸断裂比塑性胶结地层具有更大的岩爆危险性。研究结果对识别有岩爆危险的顶板岩层，有效预防硬键顶板岩层张拉断裂引起的岩爆灾害具有指导意义。

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Experimental investigation of rock mineralogical effect on energy transfer and rockbursts induced by tensile fracturing of roof strata

The elastic energy released by the tensile fracturing of hard roof strata is partially transferred to surrounding rocks and causes rockbursts during underground coal exploitation. However, the effect of rock mineralogical properties on the transferred energy and rockbursts has not been quantitatively analysed. In this study, three-point bending tests were conducted to reproduce the tensile fracturing of roof strata, with the transferred energy, i.e., the radiated energy as acoustic emission (AE) events and the kinetic energy of fractured rock, being calculated using a calibrated AE system and a digital image correlation (DIC) system. The effects of rock cementation, rock grain size and mineral composition on the energy transfer were quantitatively analysed. The energy transfer during the tensile fracture of roof strata is 2–3 orders of magnitude higher in the siliceous roof strata than in the argillaceous ones. The energy transfer for the siliceous strata stems mainly from the kinetic energy of fractured strata that is one order of magnitude higher than the radiated energy. The high kinetic energy is attributed to a very high crack velocity of 225 m/s. Owing to localized micro-shear failure and the detachment of rock grains, the energy transfer stems mainly from the radiated energy for the argillaceous strata. The energy transfer increases with the increased grain size and brittle minerals. It can be found that rock cementation plays a domain role in the rock mineralogical effects on the energy transfer and rockbursts compared to grain size and mineral component. The tensile fracture of brittle siliceous cemented strata exhibits a much greater rockburst hazard than plastic cemented strata. These findings have implications for the identification of roof strata with rockburst hazards and the effective prevention of rockburst disasters caused by the tensile fracture of hard key roof strata.

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来源期刊

International Journal of Rock Mechanics and Mining Sciences 工程技术-工程：地质

CiteScore

14.00

自引率

5.60%

发文量

196

审稿时长

18 weeks

期刊介绍： The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.