云母片岩地层大变形隧道砂浆锚杆失效力学机制研究

项目名称： 云母片岩地层大变形隧道砂浆锚杆失效力学机制研究

项目编号： No.41202201

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 左昌群

作者单位： 中国地质大学（武汉）

项目金额： 24万元

中文摘要： 在交通运输、矿山开采、水利水电等工程领域中的地下工程建设中，常遇到大规模的变质岩地层，其中云母片岩片理发育、强度低、分布广，在隧道施工过程中常出现锚杆失效、大变形和坍塌等隧道不良地质现象，开挖支护难度大，严重影响工程安全及隧道的长期稳定性。本项目采用室内外试验及理论分析的综合手段，研究锚杆失效宏观规律；获取锚杆与围岩在不同空间组合下，围岩体、灌浆体及锚杆的荷载-应力-应变特征，构建反映加锚岩体应力应变特征的锚-岩力学模型，提出数值实现方法；研究不同工况下围岩体、灌浆体及锚杆的渐进破坏过程及其物理特征，锚杆全长范围内力学演化过程，厘定锚杆失效影响因素及其作用的力学机制，提出改善云母片岩地层隧道锚杆失效的控制措施。项目研究成果对锚杆加固效应理论的丰富和完善具有重要意义，对软弱围岩隧道锚喷支护结构设计与防灾减灾具有良好的应用价值和广阔前景。

中文关键词： 云母片岩；隧道；砂浆锚杆；大变形；失效机制

英文摘要： Large-scale of metamorphic strata is very common in underground engineering construction of transportation、mining、water-hydroelectric projects and other engineering fields, especially in mica schist, which has the characteristic of well-developed foliation, low strength, wide distribution. When tunnel cross mica schist, inevitably lead to the failure of anchor support, large deformation and collapse of surrounding rocks and other bad geological phenomenon. The difficulty of excavation and supporting will be increased, and the construction safety and the long-term stability of the tunnel will be impacted seriously.. Laboratory and in-situ test with theorical analysis are utilized to obtain the failure pattern and shape of tunnel anchors The anchor-rock mechanical model is built up to reflect the stress-strain characteristics of anchored surrounding rocks on the basis of understanding the load-stress-strain features among surrounding rocks, grouting bodies and anchors in different locations. It is progressive failure procedure and physical phenomenon of surrounding rocks, grouting bodies and anchors that are studied to expose the mechanical evolutionary process of anchors in the whole-length scale. In addition, the influence factors of anchor failure with the mechanism are confirmed to put forward the improvement

英文关键词： mica-schist；tunnel；grouting anchor；failure mechanism；large deformation