应变型岩爆模型试验及其力学机制研究

doi:10.13722/j.cnki.jrme.2018.0266

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摘要为探讨应变型岩爆孕育机制，采用相似模型试验方法，基于弹性加载边界，开展深地下开挖卸荷诱发应变型岩爆试验研究。试验成功再现应变型岩爆灾害发生过程，开挖过程中测得距洞壁2，8 cm测点处环向压力增幅分别为63.3%和42.9%，径向压力降幅分别为79.2%和29.3%，距洞壁2 cm处径向及环向应变最大分别达到－2 443，1 268 ??，硐室拱顶、左壁和右壁收敛变形分别为0.37，0.53和0.55 mm，洞壁围岩产生了较明显脆性破坏，在拱顶发生岩爆现象，并表现出明显的时滞效应，最后结合试验结果建立应变型岩爆的力学演化机制。研究表明，所提出的试验方法可以较好地模拟应变型岩爆，可为岩爆理论研究、工程实践提供试验依据和数据支撑。

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	李浪1
	蒋海明2
	陈显波1
	罗中兴1

关键词 ：岩石力学, 应变型岩爆, 弹性边界, 模型试验, 力学机制, 深部岩体

Abstract：To study the initiation mechanism of strain rockbursts，model tests on strain rockbursts induced by unloading in deep underground opening were conducted based on elastic adaptive boundary. The phenomena of strain rockbursts were reproduced in the laboratory. At the distances of 2 cm and 8 cm from the tunnel wall，the hoop pressure values of the surrounding rock increase by 63.3% and 42.9% respectively，and the radial pressure values decrease by 79.2% and 29.3% respectively. The maximum values of the radial and hoop strains，2 cm away from the tunnel wall，reach －2 443 and 1 268 respectively. The convergences at the vertical，left and right sides of the wall in the tunnel after excavation are respectively 0.37 mm，0.53 mm and 0.55 mm. In the process，brittle failure phenomena of the surrounding rock including block-fracture and strain rockburst were observed，and the failure of the surrounding rock displayed an obvious lag effect. The mechanism of strain rockbursts was established. The test method can simulate strain rockburst phenomenon well，and the study conclusions can provide a reference for further theoretical study and engineering practice of rockbursts.

Key words： rock mechanics strain rockbursts elastic adaptive boundary model test mechanical mechanism deep rock mass

引用本文:

李浪1，蒋海明2，陈显波1，罗中兴1. 应变型岩爆模型试验及其力学机制研究[J]. 岩石力学与工程学报, 2018, 37(12): 2733-2741.
LI Lang1，JIANG Haiming2，CHEN Xianbo1，LUO Zhongxing1. Model test study on the mechanical mechanism of strain rockbursts. , 2018, 37(12): 2733-2741.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0266 或 http://www.rockmech.org/CN/Y2018/V37/I12/2733

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