基于改进力学等效的岩体关键节理倾角特征试验研究

doi:10.13722/j.cnki.jrme.2022.0603

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摘要为了在复杂随机节理网络中甄别出对岩体力学特性影响显著的关键节理，实现节理网络的合理简化，以倾角为变量进行含随机节理网络试样破裂力学特性研究。根据Monte Carlo理论构建随机节理网络，分别剔除某一倾角并采用3D打印技术制备7种节理试样，开展单轴压缩试验。采用变异系数法改进力学等效分析方法，综合试样强度、变形和能量特性探究关键节理倾角特征。研究结果表明：(1) 试样峰值应力和弹性模量随剔除节理倾角的增加呈增大–减小趋势，而峰值应变呈减小–增大趋势。(2) 试样峰前弹性能密度随剔除节理倾角的增加呈增大趋势，耗散能密度呈减小–稳定–增大趋势。(3) 基于变异系数法确定7种力学参数所占权重，综合分析力学特性认为各倾角节理均对试样存在显著影响，其中90°和45°倾角影响最为显著，15°倾角影响最小。

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	金爱兵1
	2
	陆通1
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	王本鑫1
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	陈帅军1
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	张静辉1
	2
	苏楠1
	2

关键词 ：岩石力学, 随机节理网络, 节理倾角, 变异系数法, 力学参数权重, 力学等效

Abstract：In order to identify the key joints that have significant influence on the mechanical properties of rock mass from the complex random joint network，and to realize reasonable simplification of the joint network. The characteristics of the random joint network were studied by taking the dip angle as a variable. A random joint network was constructed based on Monte Carlo theory，and 7 kinds of joint specimens were prepared by 3D printing technology after eliminating a certain inclination angle. The uniaxial compression test was carried out. The variation coefficient method was used to improve the mechanical equivalent analysis method，and the dip angle characteristics of key joints were analyzed comprehensively based on the strength，deformation and energy characteristics of specimens. The results show that：(1) with increasing the joint removal angle，the peak stress and elastic modulus increase and then decrease，but the peak strain decreases and then increases. (2) The prepeak elastic energy density of the specimens increases with the joint removal angle，and the dissipation energy density shows a decrease-stabilize-increase trend. (3) The weights of 7 mechanical parameters are determined based on coefficient of variation method. It is considered that every dip angles has significant influence on specimens by comprehensive analysis of mechanical properties. The 90° and 45° dip angles have the most significant effect，while the 15° dip angle has minimal effect.

Key words： rock mechanics discrete fracture network joint angle coefficient of variation method weight of mechanical parameters mechanical equivalent analysis

引用本文:

金爱兵1，2，陆通1，2，王本鑫1，2，陈帅军1，2，张静辉1，2，苏楠1，2. 基于改进力学等效的岩体关键节理倾角特征试验研究[J]. 岩石力学与工程学报, 2023, 42(1): 76-87.
JIN Aibing1，2，LU Tong1，2，WANG Benxin1，2，CHEN Shuaijun1，2，ZHANG Jinghui1，2，SU Nan1，2. Experimental study on the dip characteristics of key joints in rock mass based on improved mechanical equivalence. , 2023, 42(1): 76-87.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0603 或 https://rockmech.whrsm.ac.cn/CN/Y2023/V42/I1/76

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