Analysis reveals cohesion and chamber pressure influence tunneling in water-rich sandy strata, suggesting improved methods for similar geological conditions.
Water-rich sandy stratum, characterized by high permeability, low cohesion, and strong fluidity, poses critical challenges for large-section quasi-rectangular Earth Pressure Balance Shield Machine tunneling. Based on a quasi-rectangular shield tunneling project in the water-rich sandy stratum of Zhengzhou Metro Line 8, this study focuses on optimizing tunneling parameters. Through field measurements and statistical analysis, the evolution patterns of key parameters-including chamber pressure, cutterhead torque, total thrust, screw conveyor torque, grouting pressure, grouting volume, and advance rate-are investigated. Recommended value ranges for these parameters are proposed. The research outcomes provide data support and practical guidance for quasi-rectangular shield tunneling under similar geological conditions.
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Ma et al. (2025) studied this question.
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