基于砂型3D打印的复杂节理岩体变形破坏特征试验研究

doi:10.13722/j.cnki.jrme.2023.0671

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摘要复杂节理岩体变形破坏特征对于指导工程岩体稳定性控制具有重要理论意义和工程价值。为了克服浇筑法难以制备复杂节理试件的局限以研究节理密度对岩体变形破坏特征的影响，采用砂型3D打印技术制备基于Monte-Carlo法的含复杂节理岩体试件，通过单轴压缩试验与数字图像相关技术(DIC)相结合，研究复杂节理密度对岩体力学特征、破裂演化过程及破坏模式的影响规律，探究复杂节理对岩体的劣化效应。结果表明：随着节理密度的增加，峰值强度和峰值应变呈指数型减小，弹性模量呈线性减小；峰前总能量、弹性应变能、耗散能和峰后盈余能量均呈指数减小，而峰后释放能则呈线性减小；节理的位置和倾角共同影响着试件裂纹产生及延伸，随着节理密度的不断增加，试件破坏所产生的裂纹更易沿着特定路径扩展，节理对裂纹扩展控制作用增强。研究成果能够为复杂节理岩体力学试验的进一步研究提供新的研究思路，为复杂节理岩体变形破坏机制与稳定性分析提供理论依据。

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	王文海
	蒋力帅
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	王宗可
	赵烨

关键词 ：岩石力学, 砂型3D打印, 复杂节理岩体, 节理密度, 力学特性, 破坏特征

Abstract：The deformation and failure characteristics of complex jointed rock mass has important theoretical and practical significance for the stability control of rock engineering. In order to overcome the difficulties of casting method in generating rock-like specimens with complex joints，and to investigate the effect of joint density on the deformation and failure characteristics of rock mass，sand-powder 3D printing is employed to generate rock-like specimens with complex joints based on Monte-Carlo method. By conducting uniaxial compression test with digital image correlation(DIC)，the effect of joint density on the mechanical behaviors，fracturing evolutions and failure patterns of rock mass has been investigated. The results show that：with the increase of the joint density，the peak strength and peak strain decrease exponentially，and the elastic modulus decreases linearly. Meanwhile，the pre-peak energy，elastic strain energy，dissipative energy and post-peak surplus energy decrease exponentially，while the post-peak release energy decreases linearly. Both the location and dip angle of joints affect the initiation and propagation of cracks；with the increase of joint density，the initiated cracks are more tend to propagate along a specific path，and the control effect of joint on crack propagation becomes more significant. The results provide a new method for the experimental test of complex jointed rock mass，and provide theoretical reference for the deformation failure mechanism and stability analysis of complex jointed rock mass.

Key words： rock mechanics sand-powder 3D printing complex jointed rock mass joint density mechanical behavior failure characteristic

引用本文:

王文海，蒋力帅，何鑫，王宗可，赵烨. 基于砂型3D打印的复杂节理岩体变形破坏特征试验研究[J]. 岩石力学与工程学报, 2024, 43(3): 754-767.
WANG Wenhai，JIANG Lishuai，HE Xin，WANG Zongke，ZHAO Ye. Experimental study on deformation and failure characteristic of complex jointed rock mass based on sand-powder 3D printing#br#. , 2024, 43(3): 754-767.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0671 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I3/754

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