深埋隧洞板裂化围岩预应力锚杆锚固效应试验研究及机制分析

doi:10.13722/j.cnki.jrme.2014.0726

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摘要采用高强石膏配制板裂化模型试样，选用铝棒制作预应力锚杆模型，通过一侧约束条件下的单轴压缩试验，研究板裂化模型试样的预应力锚杆锚固效应。试验结果表明：加锚试样的峰值强度、残余强度及弹性模量均有不同程度的提高，试样峰后侧向变形显著减小，且随着预应力值的增大效果更为显著；与无锚试件岩板压折、岩片弹射的失稳破坏现象相比，加锚试件保持了较好的完整性，局部发生岩板断裂、脱落现象；试样变形破坏过程中，锚杆轴向应力变化分为线性缓慢上升期、非线性增长期和急剧上升期3个阶段，锚杆轴向应力的变化规律反映了其自身工作机制及板裂化模型试样变形特征。分析锚固机制认为，预应力锚杆的施加不仅有效降低了预制裂隙尖端拉应力集中程度，体现出抑制裂隙扩展的止裂作用，而且将试样劈裂形成的岩板加固为整体，有效抑制了岩板向临空面的屈曲变形，进而提高了试样的临界失稳荷载值。最后，基于试验结果的认识，提出针对板裂化围岩的“及时支护、区域控制及重点加固”的锚喷支护控制策略。

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关键词 ：岩石力学, 板裂化, 预应力锚杆, 锚固效应

Abstract：Model specimens of slabbing failure were made by using high-strength gypsum and pre-stressed bolt model were made by aluminum bar，the reinforced effect of bolt on the model specimens is studied under the condition of one lateral side restraint uniaxial loading test. The results show that：the peak strength，residual strength and elastic modulus of reinforced specimens increase at different degree，the lateral deformation after peak strength decrease dramatically， the effect is more obvious with the increase of pre-stress of bolt；different with the bulcking failure of slabs and ejection of slices of the unstability destruction phenomenon of unreinforced specimens， the reinforced specimens remains better integrated with local breakage and fall off of slab；the change of the axial stress of bolt during the deformation of specimens can be divided into three stages：the linear slow growth stage，nonlinear growth stage and sharp rising stage，the change rule of the axial stress of bolt reflect its working mechanism and the deformation characteristics of the specimens. The anchoring mechanisms are analyzed：the applying of pre-stressed bolt not only effectively weaken the concentration effect of stress near crack tip，playing the role of restraining the propagation of pre-existing fissures but also significantly restrict the bulcking deformation of slabs by reinforcing the splitting rock slabs into a whole，playing the role of improving the critical buckling load values of the slabbing specimens. At last，based on the results and perceive of the experiments，a“timely supporting，regional control and key area reinforcement”anchor spray support control strategy is put forward against to the control of slabbing surrounding rock.

Key words： rock mechanics slabbing failure pre-stressed bolts anchoring effect

引用本文:

周辉，徐荣超，卢景景，张传庆，孟凡震，沈峥. 深埋隧洞板裂化围岩预应力锚杆锚固效应试验研究及机制分析[J]. 岩石力学与工程学报, 2015, 34(06): 1081-1090.
ZHOU Hui，XU Rongchao，LU Jingjing，ZHANG Chuanqing，MENG Fanzhen，SHEN Zheng. EXPERIMENTAL INVESTIGATIONS AND MECHANISM ANALYSIS ON THE ANCHORING EFFECT OF PRE-STRESSED BOLT OF SLABBING SURROUNDING ROCK IN DEEP TUNNEL. , 2015, 34(06): 1081-1090.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.0726 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/I06/1081

[1]	周辉. 深埋隧洞围岩破裂结构特征及其与岩爆的关系[C]// 新观点新学说学术沙龙文集51：岩爆机理探索，北京：中国科学技术出版社，2011：106-114.(ZHOU Hui. Structural feature of surrounding rock of deep-buried tunnel and its relationship with rockburst[C]// New ideas new doctrine academic salon blogs 51：Exploration of rockburst mechanism，Beijing：China Science and Technology Press，2011：106-114.(in Chinese)) " target="_blank">
[2]	周辉，徐荣超，张传庆，等. 深埋硬岩隧洞围岩板裂化破坏研究的关键问题及研究进展[J]. 岩土力学，2014 (待刊).(ZHOU Hui，XU Rongchao，ZHANG Chuanqing，et al. Critical problems of study on slabbing failure of surrounding rock in deep hard rock tunnel[J]. Rock and Soil Mechanics，2014(to be pressed).(in Chinese)) " target="_blank">
[3]	周辉，徐荣超，卢景景，等. 板裂化模型试样失稳破坏过程及其裂隙扩展特征的试验研究[J]. 岩土力学，2014(已投稿).(ZHOU Hui，XU Rongchao，LU Jingjing，et al. Model testing study on instability destruction process of slabbing surrounding rock of deep tunnel in hard rock[J]. Rock and Soil Mechanics，2014(to be accepted). (in Chinese)) " target="_blank">
[4]	DIEDERICHS M S. The 2003 Canadian Geotechnical Colloquium： Mechanistic interpretation and practical application of damage and spalling prediction criteria for deep tunneling[J]. Canadian Geotechnical Journal，2007，44(9)：1 082-1 116. " target="_blank">
[5]	DOWDING C H，ANDERSSON C A. Potential for rock bursting and slabbing in deep caverns[J]. Engineering Geology，1986，22：265-279. " target="_blank">
[6]	谭以安. 岩爆岩石断口扫描电镜分析及岩爆渐进破坏过程[J]. 电子显微学报，1989，2：41-48.(TAN Yian. Analysis of fractured face of rockburst with scanning electron microscope and its progressive failure process[J]. Journal of Chinese Electron Microscopy Society，1989，2：41-48.(in Chinese)) " target="_blank">
[7]	何满潮，苗金丽，李德建，等. 深部花岗岩试样岩爆过程实验研究[J]. 岩石力学与工程学报，2007，26(5)：865-876.(HE Manchao，MIAO Jinli，LI Dejian，et al. Experimental study on rockburst process of granite specimen at great depth[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(5)：865-876.(in Chinese))
[8]	吴世勇，龚秋明，王鸽，等. 锦屏II级水电站深部大理岩板裂化破坏试验研究及其对TBM开挖的影响[J]. 岩石力学与工程学报，2010，29(6)：1 089-1 095.(WU Shiyong，GONG Qiuming，WANG Ge，et al. Experimental study of slabbing failure for deep-buried marble at Jinping II hydropower station and its influence on TBM excavation[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(6)：1 089-1 095.(in Chinese)) " target="_blank">
[9]	Q M GONG，L J YIN，S Y WU，et al. Rock burst and slabbing failure and its influence on TBM excavation at headrace tunnels in Jinping II hydropower station[J]. Engineering Geology，2012，124：98-108. " target="_blank">
[10]	侯哲生，龚秋明，孙卓恒. 锦屏二级水电站深埋完整大理岩基本破坏方式及其发生机制[J]. 岩石力学与工程学报，2011，30(4)：727-732.(HOU Zhesheng，GONG Qiuming，SUN Zhuoheng. Primary failure types and their failure mechanisms of deep buried and intact marble at Jinping II hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(4)：727-732.(in Chinese))
[11]	朱维申，李术才，陈卫忠. 节理岩体破坏机理和锚固效应及工程应用[M]. 北京：科学出版社，2002.(ZHU Weishen，LI Shucai，CHEN Weizhong. Failure mechanism and anchoring effect of jointed rock masses and their application to engineering[M]. Beijing：Science Press，2002.(in Chinese)) " target="_blank">
[12]	李术才，张宁，吕爱钟，等. 单轴拉伸条件下断续节理岩体锚固效应试验研究[J]. 岩石力学与工程学报，2011，30(8)：1 579-1 586. (LI Shucai，ZHANG Ning，LV Aizhong，et al. Experimental study of anchoring effect of discontinuous jointed rock mass under uniaxial tension[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(8)：1 579-1 586.(in Chinese)) " target="_blank">
[13]	陈璐，谭云亮，臧传伟，等. 加锚岩石力学性质及破坏特征试验研究[J]. 岩土力学，2014，35(2)：413-422.(CHEN Lu，TAN Yunliang，ZANG Chuanwei，et al. Test study of mechanical properties and failure characteristics of anchored rock[J]. Rock and Soil Mechanics，2014，35(2)：413-422.(in Chinese)) " target="_blank">
[14]	GRASSELLI G. 3D behavior of bolted rock joints：experimental and numerical study[J]. International Journal of Rock Mechanics and Ming Sciences，2005，42(1)：13-24. " target="_blank">
[15]	SPANG K，EGGER P. Action of fully grouted bolts in jointed rock and factors of influence[J]. Rock Mechanics and Rock Engineering，1990，23(3)：201-229. " target="_blank">
[16]	张宁，李术才，李明田，等. 单轴压缩条件下锚杆对含三维表面裂隙试样的锚固效应试验研究[J]. 岩土力学，2011，32(11)：3 288-3 294.(ZHANG Ning，LI Shucai，LI Mingtian，et al. Experimental study of reinforced effect of bolt in 3D surface fracturedspecimens under uniaxial compression[J]. Rock and Soil Mechanics，2011，32(11)：3 288-3 294.(in Chinese)) " target="_blank">