不同层理倾角砂岩单向双面卸荷岩爆弹射速度实验研究

doi:10.13722/j.cnki.jrme.2020.0753

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摘要为探究单向双面岩爆碎屑弹射速度与层理倾角的关系，利用自主研发的真三轴岩爆实验系统开展了7组不同层理倾角砂岩的单向双面卸荷岩爆实验。通过图像粒子测速方法对不同层理倾角砂岩双面卸荷岩爆双自由面的弹射速度进行分析，结果表明：双自由面岩爆碎屑弹射现象不完全相同，岩爆持续时间也不相同，但是2个自由面的平均速度变化过程均可分为4个阶段，分别为：颗粒弹射或碎屑剥离、岩块折断、碎屑弹射和弹射后期。双面卸载岩爆过程中2个自由面的平均最大速度以及最大初速度随层理倾角的变化过程均为上凹的抛物线，当层理倾角为60°和0°时分别取最小和最大值。岩爆峰值应力与岩爆时刻的最大主应力下降速率随层理倾角的变化过程同样也呈先减后增的上凹型抛物线。就岩爆发生的难易程度而言，当层理倾角为60°时最易发生，但其对应的岩爆烈度最弱，水平层理时最不易发生岩爆，若发生则为强烈岩爆。不同层理倾角砂岩岩爆烈度的差异受其脆性程度与岩爆峰值应力共同影响。

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	何满潮1
	李杰宇1
	任富强2
	刘冬桥1

关键词 ：岩石力学, 岩爆实验, 双面卸荷, 层理倾角, 脆性特征, 碎屑弹射速度

Abstract：To explore the relationship between the ejection velocity of unidirectional double-face rockburst fragments and the bedding dip angle()，seven groups of unidirectional double-face unloading rockburst experiments of sandstone with different were carried out by using a self-developed true triaxial rockburst experimental system，and the ejection velocity of double-face unloading rockburst in sandstone with differentwas analyzed by particle image velocimetry(PIV). The results show that the rockburst phenomenon and duration of the two free surfaces are not all the same，and that the average velocity change process of the two free surfaces can be divided into four stages：particle ejection or fragment stripping，fragment block breaking，fragment ejection and late ejection. In the process of double-face unloading rockburst，both the average maximum velocity and the maximum initial velocity of the two free surfaces change with in a concave parabola form，reaching the minimum and maximum values at 60° and 0° of respectively. The change processes of the peak stress and the maximum principal stress decreasing rate at the time of rockburst withalso show an upward concave parabola. In terms of the difficulty degree of rockburst，when is 60°，the rockburst is easy to happen but the corresponding rockburst intensity is the weakest. The horizontal bedding is the least prone to rockburst，while the rockburst is strong once it occurs. The difference of the rockburst intensity of sandstone with differentis affected by the brittleness and the peak stress of rockburst.

Key words： rock mechanics rockburst experiment double-face unloading bedding dip angle brittleness characteristic fragment ejection velocity

引用本文:

何满潮1，李杰宇1，任富强2，刘冬桥1. 不同层理倾角砂岩单向双面卸荷岩爆弹射速度实验研究[J]. 岩石力学与工程学报, 2021, 40(3): 433-447.
HE Manchao1，LI Jieyu1，REN Fuqiang2，LIU Dongqiao1. Experimental investigation on rockburst ejection velocity of unidirectional double-face unloading of sandstone with different bedding angles. , 2021, 40(3): 433-447.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0753 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I3/433

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