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STUDY ON MESO-MECHANICAL SIMULATION OF GROUTING FOR UNFAVORABLE GEOLOGICAL CONDITIONS

工程力学 2023年第S1期40卷 248-258页

作者：秦鹏飞钟宏伟刘坚 Department of Engineering Huanghe University of Science and TechnologyZhengzhou 451000China Key Laboratory of Geotechnical Mechanics and Dam Engineering of the Ministry of Education Hohai UniversityNanjing 370000China School of Railway Engineering Zhengzhou Railway Vocational and Technical CollegeZhengzhou 451000China

The numerical simulation program of PFC2D(Particle Flow Code in 2 Dimension)particle flow based on the flow-solid coupling principle and,on its built-in FISHTANK function library and FISH language,defines the flow equation and pressure equation of fluid domain respectively,and carries out numerical simulation calculations on the diffusion process and,on the morphology and particle displacement of slurry during the slurry injection process.By adjusting the parameters of hist,n_bond,s_bond and measure in the PFC command flow,the tracking of granular body displacement changes is achieved,and the mesoscopic mechanism such as the diffusion law of soil slurry at different depths and the change of formation porosity is revealed.The numerical calculations show that:the grouting pressure has a significant effect on the alteration and destruction of the formation structure,and the fracturing effect becomes gradually worse with increasing adhesive strength,while the porosity increases significantly with increasing grouting pressure.Based on the elastic-plastic theory of the Mohr-Colomb criterion to theoretically derive the stress field of the soil around the borehole,it is pointed out that the mechanical mechanism of annular tension and radial compression is the fundamental reason for the appearance of fracturing grouting action mode.The increase of slurry viscosity is beneficial to improve the grouting effect of fracturing-compacting grouting,while the increase of friction coefficient has little effect on the grouting effect.The comparative analysis of the laboratory tests shows that the PFC2D simulation of the grouting process is feasible.

关键词： formation grouting particle flow numerical simulation meso-analysis slurry diffusion study soil foundation mechanics calculation

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STUDY ON MESO-MECHANICAL SIMULATION OF GROUTING IN BAD GEOLOGICAL BODIES

STUDY ON MESO-MECHANICAL SIMULATION OF GROUTING IN BAD GEOLO...

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第31届全国结构工程学术会议

作者：秦鹏飞 YANG Liu FAN Miao CHEN Xiao-hong Key Laboratory of Mechanics on Disaster and Environment in Western China The Ministry of Education of ChinaLanzhou University School of Railway Engineering Zhengzhou University of Railway Vocational Technology

It is an important method to study the deformation and stress characteristics of discrete media such as rock and soil from the perspective of mesomechanic, and the PFC2D numerical simulation test technology based on the theory of mesomechanic can reveal the development dynamics of the grouting process such as the distribution of tensile and compressive stress fields, the deformation movement of soil particles and their coupling process with slurry during grouting from a mesoscopic perspective, which provides a new way for the analysis and research of grouting reinforcement of weak soil, weathered rock and fractured zone. In this paper, the numerical simulation program of PFC2D particle flow based on the flow-solid coupling principle, and using its built-in FISHTANK function library and FISH language, defines the flow equation and pressure equation of fluid domain respectively, and carries out numerical simulation calculations on the diffusion process, morphology and particle displacement of slurry during the slurry injection process. By adjusting the parameters of hist, nond, sond and measure in the PFC command flow, the tracking of granular body displacement changes is achieved, and the mesoscopic mechanism such as the diffusion law of soil slurry at different depths and the change of formation porosity is revealed. The numerical calculations show that, the grouting pressure has a significant effect on the alteration and destruction of the formation structure, and the fracturing effect becomes gradually worse with increasing adhesive strength, while the porosity increases significantly with increasing grouting pressure. Based on the elastic-plastic theory of Mohr-Colomb criterion to theoretically derive the stress field of the soil around the borehole, it is pointed out that the mechanical mechanism of annular tension and radial compression is the fundamental reason for the appearance of fracturing grouting action mode. The increase of slurry viscosity is beneficial to improve the grouting effect of fracturing-c

关键词： formation grouting particle flow numerical simulation meso-analysis slurry diffusion

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