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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (6): 912-922.doi: 10.11872/j.issn.1005-2518.2022.06.116

• Mining Technology and Mine Management • Previous Articles    

Shear Mechanical Properties and Microseismic Signal Characteristics of Ionadsorption Rare Earth Ore

Xiaojun WANG1,2(),Qiping ZHONG1,2,Kaijian HU1,2,Hao WANG1,2,Yu WANG1,2,Lihao LI1,2,Liang FENG1()   

  1. 1.School of Resources and Environment Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
    2.Jiangxi Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
  • Received:2022-07-19 Revised:2022-10-11 Online:2022-12-31 Published:2023-01-06
  • Contact: Liang FENG E-mail:xiaojun7903@126.com;liang.feng@jxust.edu.cn

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Abstract:

The in-situ leaching process is used to mine ion-adsorption rare earth ore.Due to the infiltration and seepage of leaching solution，it is easy to induce landslide instability，and shear failure is considered to be the main failure mode.In order to study the mechanical properties of shear failure of the orebody landslide，the ion adsorption type rare earth ore was taken as the research object，and the microseismic monitoring technology was used to carry out the direct shear test of the remolded soil sample in the indoor environment.The mechanical properties and microseismic signal characteristics of the specimens under different impregnation state were studied，and the influence of water content on the shear strength of the samples and the change process of shear stress-displacement under different normal stress conditions during the shear failure process were obtained.At the same time，microseismic monitoring and recording equipment was used to collect microseismic signals in the test process of rare earth samples simultaneously.The frequency domain characteristics of the test microseismic data were obtained by fast Fourier transform of the signal based on Python open source software Scipy.The corresponding waveform，time-frequency and spectral images were analyzed to obtain the spectral characteristics of the microseismic signals and the energy distribution characteristics in the frequency domain during the shear process of samples with different water content.The results show that：（1）With the increase of water content，the cohesion of rare earth samples decreases，and the failure characteristics change from plastic failure to viscous failure，and the failure behavior changes from strain softening to strain hardening.For the samples with the same water content，the strain softening characteristics of the samples are more significant with the increase of the consolidation normal stress，and there is an obvious peak strength when the water content is low.（2）The background noise does not affect the results，and the amplitude of the microseismic signal jumped significantly in a short time during the shear process.The comparative analysis of time-frequency and waveform images show that the microseismic signal existes and the main frequency is 10~20 Hz，and the change of water content does not affect the signal main frequency.With the increase of water content，the shear signal has a higher peak amplitude，the overall released energy increases，and the main shock type changes to the group shock type.（3） The signal waveform and spectrum image reflects the rare earth sample shear energy evolution characteristics of upper and lower when the soil relative sliding，including extrusion，rupture，friction，collision between particles and the formation of crack behavior such as the release of the micro size of the strength of the shock wave energy and frequency distribution，microtremor signals as rare earth soil internal activities forward the external manifestations of form.The results can be used as the discriminative basis for the microseismic signal of landslide in ion-adsorption rare earth ore.

Key words: ion-adsorption type rare earth ore, soil direct shear, shear failure, microseismic signal, infiltration, landslide damage

CLC Number: 

  • P694

Fig.1

Particle composition and content of rare earth ore"

Table 1

Chemical composition of rare earth ore（%）"

元素含量元素含量
O36.119Ga0.002
Mg0.157Y0.035
Al11.927La0.039
Si24.981Ce0.04
K2.801Nd0.017
Fe2.810Gd0.015

Table 2

Basic characteristic parameters of direct shear specimen"

含水率/%试样质量/g密度/（g·cm-3）试样干重/g浸润时间
986.6551.44479.521 min 12 s
1793.0151.55079.542 min 24 s
2599.3751.65679.563 min 36 s
33105.7351.76279.584 min 48 s
41112.0951.86879.5106 min

Fig.2

Schematic diagram of microseismic acquisition device"

Fig.3

Schematic diagram of hand cranking shear device and sensor arrangement"

Fig 4

Shear stress-displacement curves of samples with different water contents w under different vertical consolidation pressures"

Fig.5

Shear strength histogram and Mohr shear strength envelope of samples with different moisture content"

Fig.6

Change curve of cohesion of samples with different moisture content"

Fig.7

Time-domain waveform and frequency distribution of microseismic signals in contrast test"

Fig.8

Shear friction microseismic signal waveform-time-frequency-frequency domain image of sampleswith different moisture content"

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