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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (6): 750-760.doi: 10.11872/j.issn.1005-2518.2018.06.750

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Measurement of Sound Waves to Study Cumulative Damage Effect on Saturated Rock Under Frequent Production Blast Loading

Liansheng LIU1,2(),Qingliang ZHONG1,Lei YAN1,Wen ZHONG1,2,Longhua LIANG1   

  1. 1. Faculty of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China
    2. Jiangxi Key Laboratory of Mining Engineering,Ganzhou 341000,Jiangxi,China
  • Received:2017-12-08 Revised:2018-03-28 Online:2018-12-31 Published:2019-01-24

Abstract:

With the continuous progress of mine production blasting,there is a cumulative process of blasting damage to the engineering rock mass.When the accumulation exceeds its limit,it will cause slope and landslide and so on.Therefore,used the acoustic wave test method in scene and characterizing rock damage by the change of acoustic wave velocity,combined with modeling method of LS-DYNA finite element program to study the cumulative damage characteristics of horizontal engineering rock mass under frequent blast loading.The results show that the damages of engineering rock mass which with abundant joint fissure have a process of continuous accumulation when under frequent blast loading.There have been very few phenomena of rock mass damage happened in the early blasting order because of the saturated state of rock mass.The damage occurs increases gradually with blasting continued practice and it mostly form as the mutation increase of damage degree.The damage threshold of saturated rock should be less than 0.19 and the actual damage occurs should be more than the results of test.The cumulative damage of engineering rock mass under frequent blast loading,it is mainly express on the continuous expansion and coalescence of primary fissures,and the fracture of rock mass is more prone to break through in the case of water cut.

Key words: frequent production blasting, mine blasting, sound wave measurement, saturated rock, cumulative damage effect, sudden change, numerical simulation

CLC Number: 

  • TD853

Fig.1

Arrangement schematic diagram of sonic test holes"

Table 1

Parameters of productive blasting"

序号 台阶水平/m 总药量/kg 爆心距/m 单段最大药量/kg 比例药量
1 673 4 464 245 284 0.027
2 697 3 731 68 685 0.129
3 757 6 633 386 509 0.020
4 733 3 290 338 745 0.027
5 697 5 922 48 762 0.190
6 793 3 027 512 601 0.016
7 793 6 432 406 701 0.022
8 793 3 682 353 544 0.023
9 697 3 425 109 436 0.069
10 685 2 541 239 135 0.021
11 661 3 764 488 481 0.016

Fig.2

Measurement data about horizontal acoustic velocity of different section before blasting[25] "

Fig.3

Rock specimen of boreholes area"

Fig.4

Curves of the production blasting cumulative damage degree of different section"

Table 2

Measurement data about horizontal acoustic velocity of partially dried rock mass before blasting"

岩体编号 声波纵波波速/(m·s-1
1-5.00 3 789.2
2-4.00 3 618.5
3-5.00 3 826.0
4-7.00 3 944.1
5-4.50 3 508.2

Table 3

Statistics of the relation about different section and damage mutation phenomenon"

测试剖面号 岩体发生损伤突增的爆破次序 岩体发生损伤突增的测点数/个
1-2 11 1
2-3 7、8 1
1-3 5、7~10 4
1-4 5、6、7 2
2-4 - 0
2-5 6、7 1
3-5 7~11 4
4-5 3~6、8、10 5

Fig.5

Arrangement of holes in simulation blasting"

Fig.6

Curves of the simulated blasting cumulative damage degree of different point"

Fig.7

Numerical simulation model"

Table 4

Basic mechanical parameters of rock"

参数 数值 参数 数值
密度/(kg·m-3 2630 泊松比 0.22
屈服应力/MPa 75.47 剪切模量/GPa 7.184
弹性模量/GPa 17.53 黏聚力/MPa 0.198

Table 5

Parameters of explosive[31] "

参数 数值 参数 数值
密度/(kg·m-3 1631 R 1 4.5
爆速/(m·s-1 6718 R 2 1.1
爆轰压力/GPa 18.5 ω 0.35
A/GPa 540.9 E 0/(MJ·m-3 800
B/GPa 9.4

Fig.8

Expansion of fracture with water"

Fig.9

Expansion of fracture without water"

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