Experimental Study on Energy Damage Evolution Characteristics of Filling Specimens with Different Sizes Under Uniaxial Compression
Received date: 2022-02-16
Revised date: 2022-04-13
Online published: 2022-10-31
The indoor uniaxial compression tests were carried out on four filling specimens with different sizes of 40 mm，70.7 mm，100 mm and 150 mm.The effects of size changes on the energy evolution law and damage mechanism of filling were studied，and the precursory criterion of filling body failure based on elastic energy consumption ratio was obtained.The results show that the energy evolution laws of different sizes of fillings under uniaxial compression are similar，which are reflected in that the elastic strain energy is mainly accumulated before the peak stress，the energy is released and dissipated during the failure process of the specimen，the curve of dissipated energy and elastic energy shows an alternating growth trend，and the proportion of dissipated energy increases continuously and exceeds the elastic strain energy rapidly after the peak stress.With the increase of specimen size，the total input strain energy，elastic strain energy and dissipation energy of the filling body at the peak stress show a nonlinear downward trend，indicating that the energy storage limit and bearing capacity of the filling body are decreasing with the increase of specimen size.The dissipative energy characteristics of the filling body can better reflect the four stages of damage evolution in the filling body.In the initial damage stage and the stable development stage of damage，the variation range of the dissipation energy curves of the sample with the size of 40 mm is slightly larger than that of the sample with other sizes.In the stage of damage acceleration and damage failure，the corresponding curves of 40 mm and 70.7 mm samples and 100 mm and 150 mm samples show two different growth trends.The smaller the size is，the more severe the damage is.The larger the size of the filling specimen is，the greater the change range of the elastic energy consumption ratio K value of the specimen is.The elastic energy consumption ratio K value curve increases first and then decreases，continues to a low value，and then increases near the peak stress.This variation law of K value curve of elastic energy consumption ratio can be used as the precursory characteristic of critical failure of filling body.
Kui ZHAO , Zhouchao LIU , Peng ZENG , Cong GONG . Experimental Study on Energy Damage Evolution Characteristics of Filling Specimens with Different Sizes Under Uniaxial Compression[J]. Gold Science and Technology, 2022 , 30(4) : 540 -549 . DOI: 10.11872/j.issn.1005-2518.2022.04.026
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