Specimen Size Design of the Coupled True Triaxial Static and Impact Loading Tests on Rock Mechanics
We conducted numerical simulations of rock true triaxial static tests as well as the coupled true triaxial static and impact loading tests, while the size matching error of the cube specimen was analyzed based on the static simulation results and the axial stress uniformity of the specimen was discussed based on the dynamic ones. Both of the above could provide reference for the size design for a true triaxial test specimen. The results show that among the true triaxial static tests, for the same specimen size, the greater the principle stress is, the larger the absolute error of the principle stress is and the smaller the relative error is. As the specimen size increases, the absolute and relative error of all the three principal stresses grow up linearly, while the growth rate of the third principal stress error is the highest. In the coupled true triaxial static and impact loading tests, we define α for the ratio of half sine loading pulse duration to the time the stress wave needed to propagate the length of a cube specimen. When α is small, high frequency oscillations occur in the incident stress wave so that the axial stress is hard to be uniform. If α is large enough, the oscillations reduce and the peak stress uniformity coefficient decreases with the increase of α. When α is constant, the specimen stress uniformity gets worse with the increase of the first principal stress while the second and third principal stresses hardly affect the stress uniformity.
true triaxial impact load rock size matching stress uniformity
F. Xinyu X. Jinyu L. Shi W. Haoyu
Department of Airfield and Building Engineering, Air Force Engineering University, Xian, Shaanxi 71 Department of Airfield and Building Engineering, Air Force Engineering University, Xian, Shaanxi 71
国际会议
西安
英文
202-215
2016-05-25（万方平台首次上网日期，不代表论文的发表时间）