caa a22 4500 605454108 CHVBK 20210128100205.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s10064-014-0673-x doi (NATIONALLICENCE)springer-10.1007/s10064-014-0673-x Experimental study on cracking damage characteristics of a soil and rock mixture by UPV testing [Elektronische Daten] [Y. Wang, X. Li] This paper investigates the ultrasonic pulse velocity (UPV), mechanical properties and cracking characteristics of a soil and rock mixture (SRM) with varying rock percentages under uniaxial compression. Cylindrical SRM specimens (50mm diameter and 100mm height) with rock percentages of 20, 30, 40 and 50% were produced to perform a series of uniaxial compressive strength (UCS) tests. A P-wave transducer (500kHz) and associated equipment were employed for all the testing to record the ultrasonic parameters during the whole deformation process. Test results indicates the UCS and UPV decreased with increasing rock percentages for all specimens. The failure mechanism of all specimens showed a splitting-sliding mixed pattern; macro-cracks have a direction of 0°-10° parallel or sub-parallel to the normal stress. In addition, an equation was proposed for the relationship between UPV and crack width. Crack initiation stress was lower for specimens with a high rock percentage. The crack initiation stress level was about 0.2-0.5 times of peak-strength, and the total width of cracks was about 2-5mm at peak-strength. Based on the width of cracks and UPV, the total stress-strain curve was divided into three stages: the linear-elastic stage; the damage initiation and stable development stage; and the damage acceleration stage. Moreover, a three-stage damage evolution equation and constitutive model were established and compared with the testing data. These results confirm that the UPV and mechanical properties of SRMs are closely related to the rock percentage. In this regard, the UPV test can be suitably exploited for determing the cracking evolution characteristics for SRM. Springer-Verlag Berlin Heidelberg, 2014 Soil and rock mixture (SRM) nationallicence UPV testing nationallicence Mechanical properties nationallicence Cracking characteristics nationallicence Wang Y. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Science, 100029, Beijing, China aut Li X. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Science, 100029, Beijing, China aut Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/3(2015-08-01), 775-788 1435-9529 74:3<775 2015 74 10064 https://doi.org/10.1007/s10064-014-0673-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10064-014-0673-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Y. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Science, 100029, Beijing, China aut NATIONALLICENCE 700 1- Li X. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Science, 100029, Beijing, China aut NATIONALLICENCE 773 0- Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/3(2015-08-01), 775-788 1435-9529 74:3<775 2015 74 10064