Soil Plasticity Analysis for Earth Pressure Balance Shield Tunnelling Using Moving Particle Simulation
Enhancing tunnel stability and predicting ground behavior during earth pressure balance (EPB) shield tunnelling is essential for maintaining infrastructure safety. Researchers from Shibaura Institute of Technology developed a method using small-scale model experimentation and computer-aided engineering analysis to accurately forecast soil plasticity and its impact on earth pressure without the need for costly on-ground field analysis.
Geotechnical hazards can cause significant damage to infrastructure, prompting the need for effective risk prevention methods. Computer-aided simulations, such as moving particle simulation (MPS), have revolutionized deformation analysis in underground construction projects. However, the application of these tools in predicting ground behavior during tunnel design and construction is still relatively new.
By combining small-scale model testing with MPS-based computer analysis, a team of researchers investigated the plasticity of muddy soil and its influence on earth pressure during EPB shield tunnelling. The study aimed to better understand how the use of additives, like bentonite solution, affects soil plasticity and earth pressure within the tunneling chamber.
The research team’s findings revealed that earth pressure serves as a reliable indicator for assessing soil plasticity, vane shear strength, and slump value – crucial factors affecting tunnel stability and machinery operation. The proposed CAE analysis system, based on MPS, accurately reflected experimental data, offering a valuable tool for optimizing EPB shield tunnelling operations and sediment management strategies.
The study’s results have the potential to improve the safety and efficiency of underground construction projects in urban areas. By enhancing control over tunnelling operations and minimizing disturbances to surrounding ground, this research could benefit the construction of subway systems, underground utilities, and roads in densely populated areas. Additionally, the proposed strategy may help mitigate environmental impacts and enhance safety measures in earthquake-prone regions.
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Michael Thompson earned his degree in Agricultural Engineering from Purdue University in the USA, specializing in precision agriculture and smart farming technologies. His work revolves around the development of automated systems that increase farm efficiency and reduce environmental impact. Michael is now a senior engineer at a leading agri-tech company, where he designs innovative solutions for modern agriculture.