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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (2): 241-248.doi: 10.11872/j.issn.1005-2518.2019.02.241

• Mining Technology and Mine Management • Previous Articles     Next Articles

Analysis of Blasting Vibration Effects Under Different Ground Stress

Xiaohan LI(),Kewei LIU(),Jiacai YANG,Xudong LI   

  1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • Received:2018-02-04 Revised:2018-04-04 Online:2019-04-30 Published:2019-04-30
  • Contact: Kewei LIU E-mail:lixiaohan@csu.edu.cn;kewei_liu@126.com

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Abstract:

As the depth of mining, tunnel excavation, etc. continues to increase, high ground stresses appear in the interior of the rock mass. High ground stress will have a great impact on the blasting effect of rock mass. In order to study the blasting vibration effects on rock mass under different ground stresses, the finite element software ANSYS/LS-DYNA is applied to simulate the propagation of stress wave in rock mass under high ground stress.The influence of blasting on the surrounding rock mass under different ground stresses is analyzed, and the effects of different ground stresses on the blasting effect is finally obtained.A constitutive model of rock mass is selected and calibrated.Then applying implicit-explicit method, the dynamic explicit software ANSYS/LS-DYNA is used to model the blasting process of rock mass under different lateral pressure coefficients. Numerical models are built under condition that lateral pressure coefficients are 0.1, 0.5, 1.0, 2.0 and 4.0,respectively. Numerical simulation results indicate that high ground stress inhibits the blasting effects of rock mass and resists the damage extension around the blast hole. The lateral pressure coefficient has less influence on the fracture zone of rock mass, but has a greater influence on the crack zone of rock mass. And cracks will extend to the direction of higher ground stress more easily. Before the peak vibration velocity reaches its peak point, the rising time of peak particle velocity （PPV） is not influenced by lateral pressure coefficients. PPV in horizontal direction is greater than that of vertical direction when the lateral pressure coefficient is less than 1.0, while PPV in vertical direction is greater than that of horizontal direction when the lateral pressure coefficient is more than 1.0. This research can not only be used to evaluate the stability of deep rock mass structure under blasting load, but also can correctly guide blasting operation in engineering practice. More importantly, applying numerical simulation to analyze rock mass damage under blasting load can provide a reference experience for the in-depth study of the damage mechanism of rock mass under high strain rate dynamic loads.

Key words: blasting vibration, ANSYS/LS-DYNA, ground stress, lateral pressure coefficient, blasting crack, peak particle velocity

CLC Number: 

  • TD853

Table 1

Physical and mechanic parameters of rock"

岩石参数数值岩石参数数值
抗压强度/MPa21弹性模量/GPa13.1
抗拉强度/MPa1.8泊松比0.25
密度/（kg·m-3）2 009

Table 2

Parameters of rock emulsion explosive"

炸药参数数值炸药参数数值
密度/（kg·m-3）1 100R14.2
爆速/（m·s-1）3 600R20.9
A/GPa214.4ω0.15
B/GPa0.182E0/GPa4.192

Fig.1

Comparison of numerical and test results"

Fig.2

Schematic of geometric model"

Fig.3

Distribution of rock failure zone under different lateral pressure coefficients"

Fig.4

Layout of picked nodes"

Fig.5

Time-history curves of particle vibration velocity at different locations"

Fig.6

Comparison of peak particle velocity (PPV) in horizontal and vertical directions under different lateral pressure coefficients"

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