Estimation of rockburst wall-rock velocity invoked by slab flexure sources in deep tunnels

Estimation of rockburst wall-rock velocity invoked by slab flexure sources in deep tunnels
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深埋隧道板坯弯曲源引起的岩爆围岩速度估算

DOI:
10.1139/cgj-2013-0337
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发表时间:
2014-02
影响因子:
3.6
通讯作者:
Xiang, Tianbing
Xiang, Tianbing
中科院分区:
地球科学2区
文献类型:
--
作者:
Qiu, Shili;Feng, Xiating;Zhang, Chuanqing;Xiang, Tianbing

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对于冲击地压下的岩石支护,地下洞室围岩速度是一个重要的支护设计参数,它取决于诱发冲击地压破坏的震源机制。在这项研究中,为了估计仅由岩板屈曲(一种重要的岩爆震源机制)引起的围岩速度,提出了一种综合速度评估方法,该方法采用了一种优良的小偏心板柱屈曲模型,该模型依赖于一种新的岩板压缩或拉伸屈曲破坏准则。真三轴加卸载试验和岩爆实例分析表明,高地应力引起的岩体板裂对深埋巷道屈曲岩爆的演化和形成具有重要影响。采用基于能量平衡原理的方法,用解析法计算了完整岩体的层板厚度,结果表明,层板厚度参数与以下6个参数之间存在非线性关系。
For rock support in burst-prone ground, the wall-rock velocity adjacent to the surface of underground openings is a vital support design parameter, and depends on the seismic source mechanism inducing rockburst damage. In this study, to estimate the wall-rock velocity evoked only by rock slab buckling (an important rockburst source mechanism), a comprehensive velocity assessment method is proposed, using an excellent slab column buckling model with a small eccentricity, which relies on a novel compressive or tensile buckling failure criterion of rock slab. The true-triaxial loading–unloading tests and rockburst case analyses reveal that rock mass slabbing induced by high rock stress has major impacts on the evolution and formation of buckling rockburst in deep tunnels. Using a method based on the energy balance principle, the slabbing thickness of intact rock mass is also calculated by an analytical method, which indicates that the slabbing thickness parameter has a nonlinear relation to the following six...
DOI: --
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