Particle Flow Simulation of Fracture Characteristics of Rock-Concrete Combination with Single Crack

LI Qingwen; CAI Shiting; LI Hanjing; ZHONG Yuqi; LIU Yiwei

doi:10.11858/gywlxb.20240723

Volume 38 Issue 5

Sep 2024

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Chinese Journal of High Pressure Physics > 2024 > 38(5): 054202.

LI Qingwen, CAI Shiting, LI Hanjing, ZHONG Yuqi, LIU Yiwei. Particle Flow Simulation of Fracture Characteristics of Rock-Concrete Combination with Single Crack[J]. Chinese Journal of High Pressure Physics, 2024, 38(5): 054202. doi: 10.11858/gywlxb.20240723

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LI Qingwen, CAI Shiting, LI Hanjing, ZHONG Yuqi, LIU Yiwei. Particle Flow Simulation of Fracture Characteristics of Rock-Concrete Combination with Single Crack[J]. Chinese Journal of High Pressure Physics, 2024, 38(5): 054202. doi: 10.11858/gywlxb.20240723

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Particle Flow Simulation of Fracture Characteristics of Rock-Concrete Combination with Single Crack

doi: 10.11858/gywlxb.20240723

LI Qingwen^1
,,
CAI Shiting^{1,*
,
,},
LI Hanjing¹,
ZHONG Yuqi¹,
LIU Yiwei^{1, 2}

1.
School of Civil and Architectural Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China
2.
School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China

Received Date: 01 Feb 2024
Rev Recd Date: 19 Mar 2024

Available Online: 24 Jul 2024

Issue Publish Date: 29 Sep 2024

Abstract

Abstract

To study the influence of cracks with varying lengths and inclination angles on the strength and failure modes of rock-concrete combination, a numerical model of rock-concrete combination with pre-existing cracks was developed using the particle flow code (PFC). The model underwent calibration by comparing its results with indoor test data from prefabricated fractured specimens to select a set of microstructural parameters that closely align with the indoor test results. Subsequently, uniaxial compression tests were conducted on numerical models of rock-concrete composites containing pre-existing fractures. The results indicate that the bearing capacity and elastic modulus of fractured rock-concrete composites increase with the increase of fracture inclination angle. Moreover, functions were established to calculate the peak strength increment for fractures with varying lengths and inclination angles. The fracture length significantly influences the mechanical properties of composite models. The stress state at the rock interface and the confinement effect near the concrete interface determine whether cracks can extend through the interface. By analyzing the distribution of cracks, it was found that the fundamental reasons for crack initiation and propagation are the changes and transfers of the stress field. During the failure process, the failure mode gradually transitions from tension-dominated to macroscopic shear failure. The results reveal the damage evolution of uniaxial compression of single fissure rock-concrete combination material.
- single crack,
- rock-concrete combination,
- uniaxial compression test,
- crack evolution,
- particle flow

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References

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Particle Flow Simulation of Fracture Characteristics of Rock-Concrete Combination with Single Crack

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