考虑轴向裂隙影响的岩体完整性计算模型

doi:10.13722/j.cnki.jrme.2023.0381

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摘要岩体完整性是岩土工程领域的一个重要的指标，使用岩体的纵波波速反映岩体完整性是工程领域里最常见的方法。但因弹性波纵波传播的局限性，声波实测值反映的岩体完整性不能考虑轴向裂隙影响，通过现场原位声波测试和岩样裂隙检测，建立考虑岩石裂隙走向和长度的岩体完整性计算模型；并通过现场原位测试以及与传统岩体完整性计算模型对比，分析不同走向的裂隙对现场声波实测值的影响。结果表明，裂隙的方向和长度对声波测试值有决定性影响，影响程度取决于裂隙的发育方向与检测声波的传播方向的夹角，采用模型计算时，依据岩体中的裂隙参数与声波实测值的变化规律对声波测值进行修正，计算获得的岩体完整性系数克服了传统方法获得的岩体完整性系数不能全面反映岩体完整程度的难题。

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	查浩1
	魏玉峰1
	李树武2
	李常虎2
	赵天丞1

关键词 ：岩石力学, 岩体完整性, 裂隙, 纵波波速, 岩体质量评价

Abstract：Massiveness of rock mass is an important index in the field of geotechnical engineering. The most common method is using the longitudinal wave velocity of the rock mass to reflect the massiveness of rock mass. However，the integrity of the rock mass as shown by the acoustic measurements cannot take into account the impacts of axial impact due to the restriction of the longitudinal wave propagation of elastic waves. By using in-situ sonic wave testing and rock sample fracture detection，a model for calculating the massiveness of rock mass while taking into account the rock fracture orientation and length was established in this study. The influence of fractures with various orientations on the measured values of acoustic waves in situ was then analyzed by in situ testing and comparison with conventional massiveness of rock mass calculation. The findings indicate that the direction and length of the fissure have a major effect on the acoustic wave?s measured value，the extent of which depends on the angle between the fissure's growth direction and the direction in which the acoustic wave is being detected. The established model is based on the changes in the fracture parameters in the rock mass and the variation of the actual acoustic measurements to correct the acoustic measurements. The calculated intactness index of rock mass overcome the problem that the intactness index of rock mass obtained by traditional methods do not fully reflect the integrity of the rock mass.

Key words： rock mechanics rock mass integrity crack longitudinal wave velocity rock mass quality evaluation

引用本文:

查浩1，魏玉峰1，李树武2，李常虎2，赵天丞1. 考虑轴向裂隙影响的岩体完整性计算模型[J]. 岩石力学与工程学报, 2024, 43(S2): 3972-3980.
ZHA Hao1，WEI Yufeng1，LI Shuwu2，LI Changhu2，ZHAO Tiancheng1. A rock mass integrity calculation model considering the influence of axial cracks. , 2024, 43(S2): 3972-3980.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0381 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS2/3972

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