Abstract
Analysis on mechanical properties and evolution of mesostructure of soil–rock mixture samples from contact network perspective
Highlights
As a kind of common geological material in nature, soil–rock mixture (SRM) is an important part of landslide and debris flow, so it is widely concerned
A large number of experiments have been conducted to explore the mechanical properties of SRM, few researches have been focused on analyzing the mesostructure evolution of SRM from the perspective of contact network
It is a popular method to analyze soil mesostructure evolution from the perspective of contact network [2, 3], which can provide the contact information between soil particles intuitively and reflect the evolution law [4]. This manuscript analyzes the mesoscopic evolution of SRM with different rock contents by the discrete element method (DEM) from the perspective of contact network, which can bridge the micro and macro parameters for granular materials and provide a basis for formulating a micro–macro constitutive model for soil
Summary
As a kind of common geological material in nature, soil–rock mixture (SRM) is an important part of landslide and debris flow, so it is widely concerned. The contact network method often relies on the numerical simulation modeling of the discrete element, which is used to analyze the evolution of soil microstructure and the degree of particle rearrangement during the loading process. The coarse grain content of the simulated samples is less than 40%, which makes the mechanical properties of the samples closer to the soil This is because the contact force between two coarse particles is often much greater than other contact forces during the loading process, and when there are many coarse particles, there will be more contacts between the coarse particles, leading to a more complex contact network (the mixed structure is gradually supported by coarse particles [7]). The maximum flow of the flow network is introduced into the unified hardening model to predict the stress–strain relationship during the loading process
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