岩石抗拉强度测试方法的形状效应及精准度分析
投稿时间:2021-11-09  修订日期:2022-04-22  点此下载全文
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作者单位邮编
先生 太原理工大学矿业工程学院 030024
赵金昌 太原理工大学 030024
牛少卿 太原理工大学矿业工程学院 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:为研究形状效应对岩石抗拉强度的影响规律,通过相似模拟试验以及数值模拟试验对相同厚径比不同直径的圆盘试件进行劈裂试验,同时采用有限元分析软件对目前岩石直接拉伸试验涉及的两种“哑铃型”试件进行数值模拟试验。试验结果表明:①当厚径比固定为0.5时,试件直径由30 mm增大至110 mm,所测得的劈裂抗拉强度逐渐减小并趋于稳定,其变化趋势可用幂函数进行较好的拟合;②两种哑铃状试件直接拉伸所测得的抗拉强度随中心有效试验区直径的减小呈微弱减小趋势,且所测得抗拉强度小于真实抗拉强度;③几种不同形状的试件中,圆盘试件的测试结果最接近强度真实值,其次为弧形过渡面哑铃试件,最后为直线型过渡面哑铃试件,并给出三种试件强度测试结果与真实值之间的相关性系数。
中文关键词:抗拉强度  形状效应  直径  哑铃型试件  精准度对比
 
Shape effect and comparative analysis of the accuracy of rock tensile strength testing methods
Abstract:In order to study the influence of the shape effect on the tensile strength of the rock, splitting tests were carried out on the disc specimens with the same thickness-to-diameter ratio and different diameters through similar simulation tests and numerical simulation tests. At the same time, the finite element analysis software was used to directly stretch the current rock. The two "dumbbell-shaped" specimens involved in the test are numerically simulated. The test results show: ①When the thickness-to-diameter ratio is fixed at 0.5, the diameter of the specimen increases from 30mm to 110mm, and the measured splitting tensile strength gradually decreases and tends to be stable. The change trend can be better with a power function. ②The tensile strength measured by direct stretching of the two dumbbell-shaped specimens shows a slight decrease trend with the decrease of the diameter of the central effective test area, and the measured tensile strength is less than the true tensile strength; ③ Among several different shapes of specimens, the test results of the disc specimens are the closest to the true value of strength, followed by the curved transition surface dumbbell specimen, and finally the straight transition surface dumbbell specimen. The strengths of the three specimens are given. The correlation coefficient between the test result and the true value.
keywords:Tensile strength  Shape effect  diameter  Dumbbell specimen  Accuracy comparison
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