Study on the Anti-scouring and Energy Absorption Characteristics of Coupled Broken Coal Rock Mass and Packed STFs.

Considering certain issues such as the significant energy release during deep rock bursts, severe damage to roadway support systems, and compromised safety of miners, we aimed to address these problems through experimental testing and numerical simulation. First, impact tests were conducted to investigate the anti-impact and energy absorption characteristics of fractured coal rock masses and shear thickening liquid (STF)-filled materials under various conditions. Second, LS-DYNA software was utilized to simulate the impact energy absorption characteristics of the STF, confirming its capacity for energy buffering. Consequently, the concept of utilizing STF coupling for rock burst prevention was proposed. Finally, numerical simulations were employed to assess the effects of STF coupling on broken coal rock masses in underground roadways, particularly focusing on its anti-scouring and energy absorption capabilities. The findings unveiled several key points: (1) STF exhibits buffering and energy absorption effects, with a 50% mass fraction of STF demonstrating optimal performance. (2) The buffering performance of broken coal and rock particles is influenced by specific factors such as the Talbot index (particle size), impact height, particle filling thickness, and material properties. (3) STF coupling with broken coal and rock enhances buffering and energy absorption effects. Validating the effectiveness of STF materials in buffering and absorbing energy. (4) An anti-scouring and energy absorption system incorporating a weak STF-filled structure was developed to control the surrounding rock of roadways. It was concluded that cavitation and STF filling can improve the anti-scouring and energy absorption characteristics of the surrounding rock of the roadway. Additionally, a combination of the STF and surrounding rock caving significantly enhances the overall anti-scouring ability, effectively controls the shock wave velocity and strain of the surrounding rock, and substantially increases the energy absorption efficiency. These research findings establish a foundational theoretical basis and provide valuable insights for the prevention of rock burst incidents in deep mines and for the stability control of roadway surrounding rock. Highlights: It is proven that STF has the effect of buffering energy absorption. It is verified that the weak structure of the artificial structure (broken coal rock mass) has a certain buffering and energy absorption effect. STF filling coal rock has better buffering and energy absorption effects. An anti-scouring and energy absorption system with a weak STF filling structure is constructed. [ABSTRACT FROM AUTHOR]