中国铁道科学2017，Vol.38Issue(2)：64-70,7.DOI:10.3969/j.issn.1001-4632.2017.02.10
变坡面浅埋偏压隧道松动围岩压力计算方法
Calculation Method for Loose Surrounding Rock Pressure of Shallow Tunnel under Asymmetrical Pressure on Variable Slope
摘要
Abstract
According to the structure and force of shallow tunnel under asymmetrical pressure on variable slope,a calculation model was proposed to derive the formula for the cross section areas of the prism on deeply and shallowly buried sides of tunnel.Then the thrusts on both sides were obtained by limit equilibrium theory and the calculation formula was derived for the loose surrounding rock pressure of shallow tunnel under asymmetrical pressure on variable slope.It could be seen from the calculation formula that the lateral pressure coefficient increased with the increase of surface slope.Along with the increase in the thrusts of the overlaying soil on tunnel crown induced by the soil body from both sides,the vertical earth pressure on tunnel crown decreased while the lateral pressure of tunnel increased.With a section at the portal of Hejie Tunnel on Gui-Guang high speed railway as an example,the proposed model was used to calculate the loose surrounding rock pressure of shallow tunnel under asymmetrical pressure on variable slope.The obtained results were compared with measured values and those calculated by the code for design on tunnel of railway.Results show that,in practical engineering,when the slope of the soil surface on both sides of tunnel varies greatly,calculation results obtained from the proposed model are more realistic.关键词
浅埋偏压隧道/变坡面/围岩压力/水平侧压力系数/极限平衡法Key words
Shallow tunnel under asymmetrical pressure/Variable slope/Surrounding rock pressure/Lateral pressure coefficient/Limit equilibrium theory分类
交通工程引用本文复制引用
刘翔,房倩..变坡面浅埋偏压隧道松动围岩压力计算方法[J].中国铁道科学,2017,38(2):64-70,7.基金项目
中央高校基本科研业务费专项资金资助项目(2016YJS099,2016JBZ009) （2016YJS099,2016JBZ009）
