Tehnički vjesnik, Vol. 21 No. 5, 2014.
Izvorni znanstveni članak
Analysis on deformation characteristics and energy dissipation of marble under different unloading rates
Liming Zhang
; College of Science, Qingdao Technological University, Qingdao, Shandong 266033, China; Co-operative Innovation Center of Engineering Construction and Safety in Shandong Peninsula blue economic zone, Qingdao Technological University, Qingdao, Shandong 2660
Su Gao
; College of Science, Qingdao Technological University, Qingdao, Shandong 266033, China
Zaiquan Wang
; College of Science, Qingdao Technological University, Qingdao, Shandong 266033, China
Mingyuan Ren
; College of Science, Qingdao Technological University, Qingdao, Shandong 266033, China
Sažetak
Failure tests were conducted on marble under different unloading confining pressure rates to obtain the energy change curve of whole-process deformation and failure. With increasing unloading rate, the peak stress differences in marble failure were reduced, confining pressure differences in failure increased, the increment ratios of each stress confining pressure were smaller, and the volume deformation was more sensitive to changes in unloading confining pressure. Unloading failure was caused by volume expansion, and the greater the unloading rate was, the easier the rock failure was. With the increasing unloading rate, total absorbed energy increment, elastic energy increment and dissipated energy increment were reduced in the unloading stage of marble. The dissipated energy increment in the unloading process was more than five times that in the loading process, while the elastic energy increment only accounted for 10 % of total stored energy. The unloading process showed increasing dissipated energy, and the geo-stress state of the engineering rock mass determined the level of energy released in failure.
Ključne riječi
deformation characteristics; energy dissipation; marble; unloading rates
Hrčak ID:
129045
URI
Datum izdavanja:
29.10.2014.
Posjeta: 1.987 *