| 地下洞室围岩脆性破坏时的应力特征研究 |
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| 引用本文： | 王成虎,宋成科,刘立鹏.地下洞室围岩脆性破坏时的应力特征研究[J].岩土力学,2012,33(Z1):1-7. |
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| 作者姓名： | 王成虎 宋成科 刘立鹏 |
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| 作者单位： | 1. 中国地震局地壳应力研究所，北京 100085；2. 中国水利水电科学研究院 岩土工程研究所，北京 100048 |
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| 基金项目： | 中央级科研院所基本科研业务专项资助项目(No.ZDJ2009-5);铁道部重大课题,隧道围岩稳定性及其控制技术研究(No.2009G005-D) |
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| 摘 要： | 在高应力作用下，岩爆、钻孔崩落、片帮都是地下空间硬脆围岩中常见的破坏现象，这三类现象本质上均可归于完整岩体的脆性破坏，它们分别反映了高应力作用下完整岩体不同的破坏程度。通过对前人关于岩爆判据、钻孔崩落判据和片帮应力强度比判据研究成果的类比分析可知，这些脆性破坏现象在破坏时具备相同的应力背景条件。脆性破坏的应力条件可以用地下空间周边切向最大应力与岩石单轴抗压强度之比（ / ）或者工程区最大主应力与岩石单轴抗压强度之比（ / ）来描述，两种指标本质上反映了相同的应力背景条件。对于 / ， / = 0.4 ± 0.1是发生脆性破坏的应力临界条件；对于 / ， / = 0.15 ± 0.05是发生脆性破坏的应力临界条件。大量的工程实例和基于Hoek-Brown强度准则的力学分析也证明了这一背景条件的正确性。这里两种指标都取了一个范围，主要是由于不同的岩体分级、岩性和工程地质条件会对指标的界定产生较为显著的影响。
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| 关 键 词： | 高应力 脆性破坏 岩爆 钻孔崩落 应力强度比 |
| 收稿时间： | 2011-06-10 |
Study of stress characteristics of brittle failures of rock around underground openings |
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| WANG Cheng-hu,SONG Cheng-ke,LIU Li-peng.Study of stress characteristics of brittle failures of rock around underground openings[J].Rock and Soil Mechanics,2012,33(Z1):1-7. |
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| Authors: | WANG Cheng-hu SONG Cheng-ke LIU Li-peng |
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| Institution: | 1. Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China; 2. Department of Geotechnical Engineering, China Institute of Water Resources and Hydropower Research, Beijing 100048, China |
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| Abstract: | Under high stresses,rock bursts,borehole breakouts and spalling are all common phenomena which occur around the underground openings.In substance,these three phenomena all belong to brittle failures of intact rock mass;but they reflect different failure extents of intact rock mass under the action of high stresses.After analyzing and comparing the stress-strength criteria for rock bursts,borehole breakouts and spalling put forward by other specialists,we find that these brittle failure phenomena share the same stress requirement.The stress requirements for brittle failures can be defined with the ratio of the maximum tangential stress around an underground opening to the uniaxial compressive strength(σ θmax/ σ ci) or the ratio of the maximum principal stress to the uniaxial compressive strength(σ 1/ σ ci);actually,both indices reflect the same stress requirements.For σ θmax/ σ ci,the ratio of 0.4±0.1 should be the critical stress requirement,but for σ 1/ σ ci,the ratio of 0.15±0.05 should be the critical stress requirement.Large amounts of engineering cases and the mechanical analysis based on the Hoek-Brown criterion also prove the validity of these two stress requirements.Here,the two stress requirements reflect a ratio range because the complicated rock mass ratings,lithology and geotechnical conditions shall have profound impacts on the stress requirement for brittle failures. |
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| Keywords: | high stresses brittle failure rock burst borehole breakouts strength-stress ratio |
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