Study of Rock Pillar Failure Consisting of Non-Persistent Joint using Experimental Test and Fracture Analysis Code in Two Dimensions

IF 1.1 Q3 MINING & MINERAL PROCESSING
V. Sarfarazi, H. Javid, Kaveh Asgari
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引用次数: 1

Abstract

The experimental and numerical methods were used to investigate the effects of joint number and joint angle on the failure behaviour of rock pillars under a uniaxial compressive test. The gypsum samples with dimensions of 200 mm × 200 mm × 50 mm were prepared. The compressive strength of the intact sample was 7.2 MPa. The imbeded joint was placed inside the specimen. The joint length was 6 cm in a constant joint length. There were several numbers of cracks including one, two, and three cracks. In the experimental tests, the angles of the diagonal plane with respect to the horizontal axis were 0, 30, 60, and 90 degrees. The axial load was applied to the model with a rate of 0.01 mm/s. In the fracture analysis code, the angles of the diagonal plane with respect to the horizontal axis were 0, 15, 30, 45, 60, 75, and 90 degrees. A constant axial load of 135 MPa was applied to the model. The results obtained showed that the failure process was mostly dependent on the angle and number of the non-persistent joint. The compressive strength of the samples was dependent on the fracture pattern and the failure mechanism of the discontinuities. It was shown that the tensile cracks were developed whithin the model. The strength of the specimens increased by increasing both the joint angle and joint number. The joint angle of 45°  KI had the maximum quantity. The stress intensity factor was decreased by increasing the joint number. The failure pattern and failure strength were analogous in both methods, i.e. the experimental testing and the numerical simulation methods.
基于试验试验和二维断裂分析程序的非持久节理矿柱破坏研究
采用试验与数值相结合的方法,研究了单轴压缩试验中节理数目和节理角度对岩柱破坏行为的影响。制备了尺寸为200 mm × 200 mm × 50 mm的石膏样品。完整试样的抗压强度为7.2 MPa。将嵌入关节置于试件内部。在固定关节长度下,关节长度为6cm。有几条裂缝,包括一条、两条和三条裂缝。在实验测试中,对角线平面相对于水平轴的角度分别为0度、30度、60度和90度。轴向载荷以0.01 mm/s的速率作用于模型。在断裂分析规范中,对角线平面相对于水平轴的角度分别为0、15、30、45、60、75和90度。模型施加恒定轴向载荷135 MPa。结果表明,破坏过程主要取决于非持久节理的角度和数量。试样的抗压强度取决于断裂模式和不连续面破坏机制。结果表明,模型内部出现了拉伸裂纹。随着节理角度和节理数目的增加,试件的强度有所提高。关节角为45°KI时数量最多。随着接头数目的增加,应力强度因子减小。两种方法的破坏模式和破坏强度相似,即试验测试和数值模拟方法。
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来源期刊
Journal of Mining and Environment
Journal of Mining and Environment MINING & MINERAL PROCESSING-
CiteScore
1.90
自引率
25.00%
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