层状岩体各向异性声学和力学参数计算方法研究

doi:10.13722/j.cnki.jrme.2019.1174

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摘要层理弱面的分布直接影响层状岩体的声学及力学特性，也直接关系到岩体力学参数取值的合理性，制备0°，15°，30°，45°，60°，75°和90°共7种层理倾角的砂岩试样，进行纵波波速测试和单轴压缩试验。研究结果表明：(1) 随着层理倾角的增大，层状砂岩的纵波波速、弹性模量逐渐增大，峰值抗压强度呈现先减小后增大的U型变化趋势，各向异性特性明显，分别建立层状砂岩纵波波速、弹性模量与层理倾角余弦值的椭圆关系曲线，只需测试层状岩体在平行层理、垂直层理两个方向的纵波波速、弹性模量，就可以确定任意倾角岩样的纵波波速、弹性模量，为确定层状岩体不同方向声学参数和弹性参数提供了实用便捷的方法；(2) 层状岩体的主要受力方向决定其承载能力和变形破坏特征，在工程岩体质量评价相关基础参数确定时应重点关注层理角度的影响，测试方向应与主要受力方向一致，或者分别测试平行层理、垂直层理两个方向的声学参数和力学参数，按照所建立的经验公式转换到相应层理倾角再进行分析，以便获得比较准确的岩体质量评价指标。相关研究成果可为层状岩体各向异性声学及力学特性测试与分析提供较好的参考。

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	邓华锋1
	李涛1
	李建林1
	熊雨1
	齐豫1
	宛良朋2

关键词 ：岩石力学, 层状砂岩, 各向异性, 纵波波速, 椭圆曲线, 岩体质量评价, 计算方法

Abstract：The distribution of the bedding weak plane directly affects the acoustic and mechanical characteristics of bedding rock mass, and also directly affects the rationality of the value of the rock mass mechanical parameters. Sandstone samples with 7 bedding dip angles，such as 0°，15°，30°，45°，60°，75° and 90°，were prepared for longitudinal wave velocity test and uniaxial compression test. The results show that：(1) With the increase of bedding dip angle，the longitudinal wave velocity and elastic modulus of bedding sandstone gradually increase，and the peak compressive strength shows a U-shaped trend of first decreasing and then increasing，and the anisotropic characteristics are obvious. The elliptic curves of longitudinal wave velocity，elastic modulus and cosine value of bedding dip angle of bedding sandstone are established respectively. Only by testing the longitudinal wave velocity and elastic modulus of bedding rock mass in two directions of parallel bedding and vertical bedding，the longitudinal wave velocity and elastic modulus of rock samples with arbitrary dip angle can be determined，which provides a practical and convenient method for determining the acoustic parameters and elastic parameters of bedding rock mass in different directions；(2) The main direction of stress of the bedding rock mass determines its bearing capacity and deformation and failure characteristics. When determining the relevant basic parameters of engineering rock mass quality evaluation，we should pay attention to the influence of bedding angle, and the testing direction should be consistent with the main stress direction，or the acoustic parameters and mechanical parameters of parallel bedding and vertical bedding should be tested respectively，and then converted to the corresponding bedding dip angle according to the established empirical formula for analysis，so as to obtain more accurate rock mass quality evaluation indexes. Relevant research results can provide a good reference for testing and analyzing anisotropic acoustic and mechanical properties of bedding rock mass.

Key words： rock mechanics bedding sandstone anisotropy longitudinal wave velocity elliptical curve rock mass quality evaluation calculation method

引用本文:

邓华锋1，李涛1，李建林1，熊雨1，齐豫1，宛良朋2. 层状岩体各向异性声学和力学参数计算方法研究[J]. 岩石力学与工程学报, 2020, 39(S1): 2725-2732.
DENG Huafeng1，LI Tao1，LI Jianlin1，XIONG Yu1，QI Yu1，WAN Liangpeng2. Study on calculation method of anisotropic acoustic and mechanical parameters of layered rock. , 2020, 39(S1): 2725-2732.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.1174 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/2725

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