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Experimental and numerical investigation on the effects of bedding plane properties on the mechanical and acoustic emission characteristics of sandy mudstone
Engineering Fracture Mechanics ( IF 5.4 ) Pub Date : 2021-02-05 , DOI: 10.1016/j.engfracmech.2021.107582
Yaoyao Meng , Hongwen Jing , Xiaowei Liu , Qian Yin , Xingchen Wei

Bedding planes have a strong influence on the mechanical characteristics of layered rocks. To study the effects of bedding plane properties on the strength, fracture and acoustic emission (AE) characteristics of rock, Brazilian tests of sandy mudstone with different angles between the bedding plane inclination and loading direction (the bedding plane-loading angle) were first conducted. Based on the cohesive zone model in ABAQUS, the effects of the number and strength of bedding plane on the fracture and crack distributions of specimens were then investigated through numerical simulation. The experimental results showed that with increasing bedding plane-loading angle, the failure strength of the disk specimens continuously increased. The characteristics of the AE count and crack distributions (RA-AF distribution) were predominantly affected by the failure pattern. The AE count distributions were divided into two types: unimodal distribution and multimodal distribution. The cracks that formed in the specimens were divided into three forms: tensile cracks, mixed cracks and shear cracks. The numerical simulation results showed that both the number and strength of the bedding planes strongly influence the fracture and crack distributions of specimens. With the increase in bedding plane strength, the failure patterns of the specimens under each bedding plane-loading angle transformed from layer activation failure to central failure under each bedding plane-loading angle tested. Furthermore, under each bedding plane-loading angle, the failure patterns of specimens with different numbers of bedding plane were the same, and the percentage of cracks on the bedding planes increased while the percentage of cracks within the rock matrix decreased.



中文翻译:

层理面性质对砂质泥岩力学和声发射特性影响的实验和数值研究

层理平面对层状岩石的力学特性有很大的影响。为了研究层理面特性对岩石的强度,断裂和声发射(AE)特性的影响,首先进行了巴西对砂岩泥岩的测试,这些砂岩在层理面倾角和加载方向(层理面加载角)之间具有不同的角度。 。基于ABAQUS中的内聚力区域模型,通过数值模拟研究了层理面的数量和强度对试样断裂和裂缝分布的影响。实验结果表明,随着垫层平面加载角的增大,圆盘试件的破坏强度不断提高。的AE的特征计数和裂纹分布(RA -自动对焦分布)主要受破坏模式的影响。AE计数分布分为两种类型:单峰分布和多峰分布。试样中形成的裂纹分为三种形式:拉伸裂纹,混合裂纹和剪切裂纹。数值模拟结果表明,垫层平面的数量和强度都强烈影响试样的断裂和裂纹分布。随着垫层平面强度的增加,在每个垫层平面加载角下,试样的破坏模式从层激活失效转变为在每个测试垫层平面加载角下的中心失效。此外,在每个垫层加载角度下,不同垫层数量的标本的破坏模式是相同的,

更新日期:2021-02-09
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