干燥与饱水状态下含尖端相交裂隙砂岩的力学特性及破裂演化规律试验研究

doi:10.13722/j.cnki.jrme.2023.0972

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摘要岩体中裂隙的存在会影响岩体工程的稳定性，而裂隙的分布形式及地下水的作用对岩体力学特性和破裂演化规律有着显著的影响。通过对干燥和饱水状态下含尖端相交裂隙砂岩试样进行单轴压缩试验，研究尖端相交裂隙的夹角和地下水对砂岩力学特性及破裂演化规律的影响。研究结果表明：尖端相交裂隙的夹角和地下水对砂岩的力学性能和破裂演化规律均有较大影响。含尖端相交裂隙砂岩试样的应力–应变曲线中裂纹萌生与扩展阶段相较于完整试样更早出现且在峰值应力前产生明显的应力降现象，并在峰后破坏阶段产生台阶状应力跌落现象；随着尖端相交裂隙夹角的增加，试样峰值应力与起裂应力逐渐增加，应力集中部位由倾斜裂隙内尖端过渡到外尖端。而地下水的存在将增加尖端相交裂隙岩样的延性，减弱尖端相交裂隙在应力–应变曲线中产生的应力降和台阶跌落现象，使岩样的峰值应力和起裂应力随着尖端相交裂隙夹角的增大呈现出先减小后增大再减小的趋势；此外，地下水的存在将减弱岩样裂隙处应力集中程度，减少裂纹起裂数量，使水平裂隙成为含尖端相交裂隙饱水岩样破坏的主导裂隙。

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	郝瑞卿1
	曹平2
	王华3
	靳瑾4

关键词 ：岩石力学, 尖端相交, 强度特性, 起裂形式, 破坏模式, 饱水, 砂岩

Abstract：The existence of cracks in rock mass can affect the stability of rock engineering，and the distribution form of cracks and the groundwater have a significant impact on the mechanical properties and fracture evolution law of rock mass. By conducting uniaxial compression tests on sandstone samples with tip intersecting cracks，the effects of the intersecting angle between tip intersecting cracks and the groundwater on the strength，deformation，and fracture evolution characteristics of sandstone were studied. The research results indicate that the intersecting angle between the tip intersecting cracks and the groundwater have a significant impact on the mechanical properties and fracture evolution law of sandstone. The tip intersecting cracks will cause the stress-strain curve of the rock sample to enter the crack initiation and propagation stage earlier，and there will be a significant stress drop phenomenon before the peak stress，while a stepped drop phenomenon will appear in the post peak failure stage. As the angle between the tip intersecting cracks increases，the peak stress and initiation stress of the sample gradually increase，and the stress concentration area transitions from the inner tip of the inclined crack to the outer tip. The presence of groundwater will increase the ductility of rock samples with tip intersecting cracks，weaken the stress drop and step drop phenomenon generated by tip intersecting cracks in the stress-strain curve，and make the peak stress and initiation stress of rock samples show a trend of first decreasing，then increasing，and then decreasing with the increase of the angle between tip intersecting cracks at. In addition，the presence of groundwater will weaken the degree of stress concentration at the cracks of rock samples，reduce the number of crack initiation，and make horizontal crack the dominant crack for the failure of saturated rock samples with tip intersecting fractures.

Key words： rock mechanics tip intersecting strength characteristics crack initiation mode failure mode saturation sandstone

引用本文:

郝瑞卿1，曹平2，王华3，靳瑾4. 干燥与饱水状态下含尖端相交裂隙砂岩的力学特性及破裂演化规律试验研究[J]. 岩石力学与工程学报, 2024, 43(7): 1696-1706.
HAO Ruiqing1，CAO Ping2，WANG Hua3，JIN Jin4. Mechanical properties and fracture behaviors of sandstone in dry and saturated states with tip intersecting cracks. , 2024, 43(7): 1696-1706.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0972 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I7/1696

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