SHPB Experiment and MPM Simulation on Dynamic Properties of Unsaturated Clay Under Impact Loading
Source abstract
Abstract
Accurate characterization of soil dynamic response is paramount for geotechnical and protective engineering. However, the impact properties of unsaturated cohesive soil have not been well characterized due to lack of sufficient research. For this purpose, impact tests using the Split Hopkinson Pressure Bar (SHPB) were elaborately designed to investigate the dynamic stress–strain response of unsaturated clay with strain rates of 204~590 s−1. As the strain rate increased up to 500 s−1, a lock-up behavior was observed in the plastic flow stage, which can be explained as the breakage and rearrangement of soil gains under a high level of stress. Further, the strain rate dependency of the dynamic strength was quantitatively characterized by the Cowper Symonds (CS) model and the CS coefficients were determined to be the intercept of 55 and slope of 0.8 in the double logarithmic scale of Dynamic Increase Factor (DIF) and strain rate space. Furthermore, the SHPB test was reproduced using a modified Material Particle Method (MPM), which involves an improved dynamic constitutive model for unsaturated soil considering the strain rate effect. The simulated stress–strain curves basically agree with the experimental results, indicating the feasibility of MPM for investigating the dynamic properties of unsaturated soil under SHPB impact loading.
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Research context
OpenAlex topics: Fluid Dynamics Simulations and Interactions · High-Velocity Impact and Material Behavior · Landslides and related hazards
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, China
Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, China
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, China
College of Civil and Transportation Engineering, Hohai University, Nanjing 210024, China
College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210024, China
Funding
National Natural Science Foundation of China · Jiangsu Funding Program for Excellent Postdoctoral Talent · State Key Laboratory of Precision Blasting and Hubei Key Laboratory of Blasting Engineering, Jianghan University
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