Effect of the degree of natural cracks development on the mechanical properties of marble

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2023-07-10 DOI:10.1007/s10064-023-03319-9

Yong Han, Yue-Mao Zhao

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Abstract

The stability of deep-buried hard rock roadways requires urgent improvement when the surrounding rock contains numerous cracks. In this study, a quantitative method using two parameters, the preferential angle (θ_p) and degree of crack development coefficient (K), was developed to measure the degree of natural cracks development in rock specimens. True triaxial compression tests were performed on intact marble and marble containing natural cracks to investigate the effect of the degree of development of natural cracks on the strength and failure modes. Compared with the results for the intact specimens, the peak strength and crack damage stress of the marble containing a single natural crack decreased nonlinearly and then increased with an increase in the preferential angle. The results for marble containing multiple cracks exhibited a similar pattern. The peak strength and crack damage decreased logarithmically with an increase in the degree of the crack development coefficient. There were four main failure modes in the specimens containing cracks: shear failure caused by compression, natural crack shear, tensile failure, and tension–shear mixing. With an increase in K, the impact of the cracks on the macroscopic failure of the rock increased. As for the specimens containing multiple cracks, there were multiple failure modes in the same specimen, including shear failure, crack shear or tensile failure, and the intersection of natural cracks and newly generated macroscopic cracks.

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天然裂缝发育程度对大理石力学性能的影响

深埋硬岩巷道围岩存在大量裂缝时，其稳定性亟待提高。本文提出了一种利用优先角(θp)和裂缝发育程度系数(K)两个参数定量测量岩石试样中自然裂缝发育程度的方法。对完整大理岩和含天然裂缝大理岩进行真三轴压缩试验，研究天然裂缝发育程度对大理岩强度和破坏模式的影响。与完整大理岩试样相比，含单一天然裂纹大理岩的峰值强度和裂纹损伤应力随优先角的增大呈非线性先减小后增大的趋势;含有多个裂缝的大理石的结果也显示出类似的模式。峰值强度和裂纹损伤随裂纹发展系数的增大呈对数递减。含裂纹试件的破坏模式主要有四种:压缩剪切破坏、自然裂纹剪切破坏、拉伸破坏和拉剪混合破坏。随着K的增大，裂纹对岩石宏观破坏的影响增大。对于含有多个裂纹的试件，同一试件存在多种破坏模式，包括剪切破坏、裂纹剪切或拉伸破坏、自然裂纹与新产生的宏观裂纹的交集。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.