深埋隧洞板裂屈曲岩爆机制及物理模拟试验研究

doi:10.13722/j.cnki.jrme.2014.0874

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摘要

结合锦屏二级水电站深埋隧洞典型岩爆案例，分析板裂屈曲岩爆的发生机制及结构面作用机制，研究表明：开挖卸荷作用导致围岩板裂化结构的形成，切向集中应力作用下岩板向开挖空间内屈曲变形并积聚应变能，当板裂化围岩结构自身积聚的能量超过其储能极限，或在外界扰动作用下发生突发性失稳破坏，形成以岩板压折、岩块弹射为特征的岩爆现象；渐进的板裂化破坏过程起到了活跃结构面的作用，而结构面的存在及其扩展降低了板裂化围岩结构的稳定性，促进了岩爆的发生；不同倾角的结构面在板裂屈曲岩爆中的作用机制不同。结合板裂化围岩的结构特征，配制板裂化模型试样，采用2种不同的加载方式进行板裂屈曲岩爆的物理模拟试验，结果表明：预制裂隙的扩展将试样劈裂成板，压缩荷载进一步作用下岩板向临空面屈曲变形，并最终形成岩板压折、岩片弹射的失稳破坏现象。研究结果对于认识深埋隧洞板裂屈曲岩爆机制及其支护控制具有重要意义。

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	周辉1
	徐荣超2
	卢景景1
	张传庆1
	孟凡震1
	沈峥1

关键词 ：岩石力学, 深埋隧洞, 板裂屈曲岩爆, 发生机制, 结构面作用机制, 物理模拟试验

Abstract：

With combination of typical rockburst cases happened in deep tunnels of Jinping II hydropower station，formation mechanism and function mechanism of structural plane of slab buckling rockburst were analyzed. The research shows that slabbing failure of surrounding rock is caused by excavation unloading and the action of the tangential concentrated stress will lead to the buckling deformation of slabs towards the excavation space as well as growing strain energy stored in the slabs. When the amount of energy stored in the slabbing rock structure exceeds its energy storage limitation，or due to external disturbances，slab buckling rockburs will take place with the characteristics of crushing of slabs and ejection of rock. The gradual failure process of slabbing failure makes the structural planes be active. The existence and extension of structural planes will reduce the stability of slabbing rock structure which in turn promotes the occurrence of rockburst. The structural planes with different inclination angles play different roles in the formation of slab buckling rockburst. Slabbing specimens were made according to the architectural feature of slabbing surrounding rock and physical simulation tests of slab buckling rockburst were conducted under two different loading modes. The experiment results show that propagation of pre-existing fissures makes the specimens split into slabs，and further action of compression load cause buckling deformation of slabs towards the free face which leads to the instability destruction phenomenon of specimens characterized by crushing of slabs and ejection of rock. The research results have an important significance for understanding and support control of slab buckling rockburst.

Key words： rock mechanics deep tunnel slab buckling rockburst formation mechanism mechanism of structural plane physical simulation test

引用本文:

周辉1，徐荣超2，卢景景1，张传庆1，孟凡震1，沈峥1. 深埋隧洞板裂屈曲岩爆机制及物理模拟试验研究[J]. 岩石力学与工程学报, 2015, 34(S2): 3658-3666.
ZHOU Hui1，XU Rongchao2，LU Jingjing1，ZHANG Chuanqing1，MENG Fanzhen1，SHEN Zheng1. STUDY ON MECHANISMS AND PHYSICAL SIMULATION EXPERIMENT OF SLAB BUCKLING ROCKBURST IN DEEP TUNNEL. , 2015, 34(S2): 3658-3666.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.0874 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/3658

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