坡度因素对雪峰山隧道开挖面最小支护力的影响研究  

Study on the Gradient Affect to Minimal Supporting Force of Excavation Face in XUE FENG SHANG Tunnel

作　　者：黄戡[1,2] 刘宝琛[1] 彭建国[2] 赵丹[1] 丁国华[2] 胡惠华[2] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075 [2]湖南省交通规划勘察设计院,湖南长沙410008

出　　处：《公路工程》2010年第1期9-12,27,共5页Highway Engineering

基　　金：交通部西部交通建设科技项目(2003-318-798-02)

摘　　要：在引用Horn筒仓模型的基础上,首先引进隧道开挖面处的坡度角对模型进行改进;然后根据极限平衡条件对模型在开挖面处进行空间受力分析;最后推导出不同坡度下开挖面所需最小支护力的表达式。并以雪峰山隧道为例进行设计计算,计算结果表明:在坡度值变化范围不大的条件下,隧道坡度与隧道开挖面所需的最小支护力近似成线性关系。最后与简化计算公式对比分析,验证了推导表达式的实用性和准确性。At first , It is inducted the gradiente of excavation surfae to improve the model based on Horn silo model in this paper; And then, It is mechanical analysised on the model of space in the excava- tion surface according to limit equilibrium conditions; At last, It is derived expression of minimum sup- porting strength with the excavation surface of different gradiente. It is designed and calculated with XUE FENG SHANG tunnel; The calculation results show that： In the condition with gradiente changes limited, It is a linear relationship between the gradiente of tunnel and minimum supporting strength required for the tunnel excavation surface. Finally , It is verifyed the practicality and accuracy of the derived ex- pressions by analysis and calculation with the simplified formula.

关 键 词：坡度因素 筒仓模型 极限平衡 特长隧道 支护力 

分 类 号：U455.7[建筑科学—桥梁与隧道工程]