杏树岩隧道穿越软弱破碎围岩变形机理及控制技术研究

Study on Deformation Mechanism and Control Technology of Xingshuyan Tunnel Through Weak and Broken Surrounding Rock

在软弱岩体深埋隧道施工中,大挤压变形问题尚未得到解决需予以关注。以杏树岩隧道为工程背景,通过现场勘测和试验研究了隧道变形破坏特征和机理,得出围岩强度低、构造应力高、施工方法及支护方案不合理及地下水影响是造成隧道变形破坏的主要原因。为了控制隧道变形破坏,提出了围岩变形控制措施,并通过数值计算和现场实践验证了方案的合理性。结果表明,新支护方案下围岩变形得到有效控制,方案合理有效。研究结果可为软岩隧道变形控制提供理论依据和技术参考。

In the construction of deeply buried tunnels in weak rock,the issue of significant extrusion deformation remains unresolved and requires attention.Using the Xingshuyan Tunnel as the engineering case study,this paper investigates the characteristics and mechanisms of tunnel deformation and damage through on-site surveys and tests.The findings reveal that low surrounding rock strength,high tectonic stress,unreasonable construction methods and support schemes,as well as the influence of groundwater,are the primary causes of tunnel deformation and damage.To address this,deformation control measures for the surrounding rock are proposed and validated through numerical simulations and field practice.The results show that the new support scheme effectively controls tunnel deformation,proving both reasonable and effective.These findings provide a theoretical foundation and technical reference for the deformation control of tunnels in soft rock conditions.