摘要
锚杆预应力也是影响地下洞室工程围岩支护效果的重要因素,探讨其对支护效果的具体影响可以对具体工程的锚杆参数设计以及相关的理论研究提供有力的支持和借鉴。文章以清河水库第二泄洪洞建设为研究背景,利用数值模拟的方法探讨了锚杆预应力对高地应力软岩泄洪洞围岩应力和稳定性的影响,结果显示锚杆预应力会对隧洞开挖支护后的围岩位移、应力以及塑性区面积产生显著影响。综合研究成果,建议在背景工程施工中选择100MPa的锚杆预应力值。
Anchor prestress is also an important factor affecting the surrounding rock support effect of underground cavern engineering.Discussing its specific influence on the support effect can provide strong support and reference for the bolt parameter design of specific projects and related theoretical research.Taking the construction of the second spillway tunnel of Qinghe Reservoir as the research background,this paper discusses the influence of bolt prestress on the surrounding rock stress and stability of high ground stress soft rock spillway tunnel by means of numerical simulation.The results show that the bolt prestress will have a significant impact on the surrounding rock displacement,stress and plastic zone area after tunnel excavation and support.Based on the research results,it is suggested that the anchor prestress value of 100MPa should be selected in the construction of background project.
作者
李芳存
Li Fangcun(Chaoyang Linghe River Nature Reserve Administration,Chaoyang City122000,Liaoning,China)
出处
《吉林水利》
2022年第9期46-49,共4页
Jilin Water Resources
关键词
软岩隧洞
锚杆预应力
支护效果
soft rock tunnel
bolt prestress
supporting effect
