Mechanical responses and reinforcement assessment of non-typical in-situ enlargement for closely spaced tunnel groups in weak surrounding rock

Key Points

• Mechanical responses indicate the potential for improving tunnel stability under various conditions.
• Reinforcement assessment highlights enhanced safety measures for tunnels built in weak surrounding rock.
• Analysis focuses on the effects of in-situ enlargement on closely spaced tunnel configurations.
• Results imply that strategic reinforcement can reduce risks associated with weak rock formations.