地应力下柱面应力波在节理岩体中传播规律研究

doi:10.13722/j.cnki.jrme.2017.1013

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摘要

考虑地应力对柱面应力波在完整岩石中传播的物理及几何衰减，及与节理相互作用关系的影响，推导出地应力下柱面波在节理岩体中的传播方程。同时开展模型试验，对不同地应力下柱面波在完整岩石及节理岩体中的传播及衰减规律分别进行研究，并将试验与理论结果进行对比分析。研究结果表明：柱面波在完整岩石中的物理衰减随着围压增加先减小后增大，当侧压力系数改变时，柱面波物理衰减的变化与差应力大小有关；柱面波在节理岩体中的透射系数与节理角度和柱面波在节理及完整岩石中的衰减有关，无围压时透射系数随着节理角度增大而减小，存在围压时透射系数的变化规律则相反。随着围压或侧压力系数增加，透射系数呈现出先增大后减小的趋势；不同围压下柱面波在节理岩体中的透射系数理论与试验值较为一致，验证了所推导出的传播方程的合理性。

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	李新平1
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	董千2
	刘婷婷1
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	黄俊红2

关键词 ：岩石力学, 柱面应力波, 节理岩体, 模型试验, 地应力, 传播规律

Abstract：

Considering the effect of in-situ stress on the physical and geometrical attenuation of cylindrical stress wave propagation，and the interaction between cylindrical stress wave and a joint，the propagation equation of cylindrical wave in jointed rock mass under in-situ stress is derived. Meanwhile，a model test was carried out to study the propagation and attenuation law of cylindrical stress wave in the intact and jointed rock mass under different in-situ stresses，the measured and theoretical results are compared and analyzed. The results show the physical attenuation of cylindrical wave in the intact rock decreased firstly then increased with the increase of confining pressure，when the lateral pressure coefficient changes，the variation of the physical attenuation is related to the magnitude of the differential stress. The transmission coefficient of cylindrical wave in jointed rock mass is related to the angle of joints and the attenuation in joints and rock，the transmission coefficient decreased with the increase of the joint angle without confining pressure，and the variation law of transmission coefficient is contrary under confining pressure. The transmission coefficient increased firstly then decreased with the increase of confining pressure and the lateral pressure coefficient. The theoretical and measured transmission coefficients under different confining pressures are relatively close，the validity of derived propagation equation is verified.

Key words： rock mechanics cylindrical stress wave jointed rock mass model test in-situ stress propagation law

引用本文:

李新平1，2，董千2，刘婷婷1，2，黄俊红2. 地应力下柱面应力波在节理岩体中传播规律研究[J]. 岩石力学与工程学报, 2018, 37(S1): 3121-3131.
LI Xinping1，2，DONG Qian2，LIU Tingting1，2，HUANG Junhong2. Research on propagation law of cylindrical stress wave in jointed rock mass under in-situ stress. , 2018, 37(S1): 3121-3131.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1013 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS1/3121

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