TY - JOUR
T1 - Experimental study of stress wave propagation and energy characteristics across rock specimens containing cemented mortar joint with various thicknesses
AU - Han, Zhenyu
AU - Li, Diyuan
AU - Zhou, Tao
AU - Zhu, Quanqi
AU - Ranjith, P. G.
N1 - Funding Information:
The work was financially supported by the Distinguished Youth Science Foundation of Hunan Province of China (No. 2019JJ20028) and the Joint Funds of the National Natural Science Foundation of China (No. U1934211). The authors also thank Mr. Meng Liu at Central South University and Mr. Yan Zhang at Tianjin University for their support in laboratory tests.
Funding Information:
The work was financially supported by the Distinguished Youth Science Foundation of Hunan Province of China (No. 2019JJ20028 ) and the Joint Funds of the National Natural Science Foundation of China (No. U1934211 ). The authors also thank Mr. Meng Liu at Central South University and Mr. Yan Zhang at Tianjin University for their support in laboratory tests.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/7
Y1 - 2020/7
N2 - Stability and safety of rock structures are easily influenced by the dynamic disturbance, especially when weak joint planes exist. In order to investigate the filling joint effect on the dynamic response of rock specimens, a series of impact dynamic tests were conducted by a modified split Hopkinson pressure bar (SHPB) system. A sandwich type of sandstone specimens filling with different thicknesses layer of cemented mortar (filling joint) were tested in the study. The results show that the transmission coefficient, dynamic strength and energy absorption all decrease with increasing joint thickness. However, the reflection coefficient, peak strain and joint closure show an opposite variation trend. In addition, the deformation of the cemented mortar joint is the main reason to cause the deformation and final failure of jointed rock specimens. Tensile cracks dominate the fracturing behavior during the dynamic loading, but they have a slight influence on the final failure mode which transforms from localized slabbing to axial splitting failure with the filling joint becoming thicker.
AB - Stability and safety of rock structures are easily influenced by the dynamic disturbance, especially when weak joint planes exist. In order to investigate the filling joint effect on the dynamic response of rock specimens, a series of impact dynamic tests were conducted by a modified split Hopkinson pressure bar (SHPB) system. A sandwich type of sandstone specimens filling with different thicknesses layer of cemented mortar (filling joint) were tested in the study. The results show that the transmission coefficient, dynamic strength and energy absorption all decrease with increasing joint thickness. However, the reflection coefficient, peak strain and joint closure show an opposite variation trend. In addition, the deformation of the cemented mortar joint is the main reason to cause the deformation and final failure of jointed rock specimens. Tensile cracks dominate the fracturing behavior during the dynamic loading, but they have a slight influence on the final failure mode which transforms from localized slabbing to axial splitting failure with the filling joint becoming thicker.
KW - Cemented mortar joint
KW - Deformation
KW - Energy consumption
KW - SHPB
KW - Wave propagation
UR - http://www.scopus.com/inward/record.url?scp=85084410198&partnerID=8YFLogxK
U2 - 10.1016/j.ijrmms.2020.104352
DO - 10.1016/j.ijrmms.2020.104352
M3 - Article
AN - SCOPUS:85084410198
SN - 1365-1609
VL - 131
JO - International Journal of Rock Mechanics and Mining Sciences
JF - International Journal of Rock Mechanics and Mining Sciences
M1 - 104352
ER -
