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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (4): 540-549.doi: 10.11872/j.issn.1005-2518.2022.04.026

• Mining Technology and Mine Management • Previous Articles    

Experimental Study on Energy Damage Evolution Characteristics of Filling Specimens with Different Sizes Under Uniaxial Compression

Kui ZHAO1,2(),Zhouchao LIU1,2,Peng ZENG1,2(),Cong GONG1,2   

  1. 1.School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
    2.Key Laboratory of Mining Engineering of Jiangxi Province, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
  • Received:2022-02-16 Revised:2022-04-13 Online:2022-08-31 Published:2022-10-31
  • Contact: Peng ZENG E-mail:yglmf_zk@163.com;zengpeng23@126.com

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Abstract:

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.

Key words: size effect, filling body, energy damage, elastic energy consumption ratio, failure precursor

CLC Number: 

  • TD853

Fig.1

Relationship between elastic strain energy and dissipated energy"

Fig.2

Backfills of different sizes"

Fig.3

RMT-150C rock mechanics experimental equipment system"

Fig.4

Stress-strain curves of backfills with different sizes"

Fig.5

Failure forms of backfills with different sizes"

Fig.6

Relationship curves between energy and stress-strain of backfills with different sizes"

Table 1

Strain energy corresponding to peak stress of backfills with different sizes"

试样尺寸

/mm

峰值点总能量

/（kJ·m-3）

峰值点弹性能

/（kJ·m-3）

峰值点耗散能

/（kJ·m-3）

40A11046048
A21106541
A31016146
平均值1056245
70.7B1753736
B2744237
B3794432
平均值764135
100C1373711
C2452413
C341299
平均值413011
150D1422510
D2372712
D3352614
平均值382612

Fig.7

Curves of peak point energy index with size"

Fig.8

Relation curves between dissipated energy and strain of backfills with different sizes"

Fig.9

Curves of elastic energy consumption ratio versus strain"

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