| Citation: |
WANG Xingchen, WANG Zhiliang, HUANG Youpeng, JIA Shuailong. Particle flow simulation of macro- and meso-mechanical behavior of the prefabricated fractured rock sample[J]. Hydrogeology & Engineering Geology, 2021, 48(4): 86-92. doi: 10.16030/j.cnki.issn.1000-3665.202010044
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Particle flow simulation of macro- and meso-mechanical behavior of the prefabricated fractured rock sample
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Abstract
To examine the macro-and meso-mechanical behaviors and crack propagation mode of the prefabricated and fractured rock sample under biaxial compression, the particle flow code (PFC) is first used to study the effect of the micro-parameters of the parallel bond model on the macro-parameters. Combined with the conventional triaxial compression test of intact granite, the meso-parameters are calibrated. The mechanical properties of the sample with prefabricated double fractures (upper fracture ① and lower fracture ②) under confining pressure are simulated with the set of parameters. The results show that the PFC code and the calibrated parameters can better simulate the failure of the complete samples. As the confining pressure increases, the peak strength and elastic modulus of the double-fractured rock sample increase. When the angle α2 between the lower fracture ② and the horizontal is 90°, both of them reach the maximum values. Under different α2, the simulated crack evolution of each rock sample goes through three stages of crack initiation, development and stabilization. With the decreasing confining pressure and the increasing axial stress, the damage of the force chains between particles becomes more severe. Due to the difference in the concentration and distribution of the tensile force chains, the cracks along the length of the horizontal fracture propagate along the axial direction, and the penetration of the two fractures presents different ways.
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Keywords:
- PFC /
- parallel bonding model /
- parameter calibration /
- double-fissure rock sample /
- crack evolution
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References
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WANG Xingchen, WANG Zhiliang, HUANG Youpeng, JIA Shuailong. Particle flow simulation of macro- and meso-mechanical behavior of the prefabricated fractured rock sample[J]. Hydrogeology & Engineering Geology, 2021, 48(4): 86-92. doi: 10.16030/j.cnki.issn.1000-3665.202010044
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Figure 1.
The PFC 2D model and parallel-bond bond
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Figure 2.
Effects of meso-parameters on macro-parameters
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Figure 3.
Comparison of the experimental and simulated results
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Figure 4.
Prefabricated double fractures and the corresponding sample model
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Figure 5.
Effects of fracture angle α2 on macroscopic parameters under different confining pressures
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Figure 6.
Final crack growth pattern under different fracture angles α2（σ3=5 MPa）
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Figure 7.
Crack evolution processes under different fracture angle α2（σ3=5 MPa）
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Figure 8.
Force chains failure states of the samples under different confining pressures when α2=0º
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Figure 9.
Force chains around crack ② when α2=0°
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Figure 10.
Force chains around the fissure ② under the confining pressure of 5 MPa