Application of Green Support Construction Technology in Mining Tunnels

This study investigates the engineering application of green support construction technology in the Changjiu Mining 4# Tunnel (total length 1672.03 m; longitudinal slope 2.99‰). Support schemes were optimized for different rock mass classes (II–V), covering rock bolts, shotcrete, steel arch support, and advanced support. Green materials and processes—including full-length bonded bolts, self-drilling grouting bolts, wet-mix shotcrete, alkali-free liquid accelerators, and silica fume admixtures—were adopted to enhance durability, environmental performance, and construction efficiency. Key technical parameters such as mix proportions, rebound rates (≤25% for arch areas; ≤15% for other sections), and grouting pressures (0.5–1.0 MPa) were rigorously controlled. The application achieved significant improvements in support stability, material utilization, and ecological impact reduction. The findings provide technical reference for similar underground engineering projects under comparable geological conditions.