摘要
福州市湖东东路隧道暗挖段穿越砂土状强风化花岗岩地层,地表沉降控制要求高,设计采用水平旋喷桩预加固辅助措施。为指导实际施工、确定施工的监测重点,文章采用三维弹塑性有限元方法,对水平旋喷预加固效果及隧道结构体系位移变化规律进行了研究。结果表明,与无旋喷桩加固工况相比,采用旋喷桩加固后,隧道拱顶的最终沉降值减少了63.45%,掌子面的最终纵向位移值减少了69.6%,掌子面的塑形应变区范围也明显减小。水平旋喷桩预加固措施能够有效地控制变形,加固效果十分明显。
In Fuzhou, the bored section of the Hudongdonglu tunnel passes through a sandy strong weathered gran- ite stratum and therefore requires strict control of surface deformation. Horizontal jet grouting piles pre-reinforce- ment technology was adopted in its design. In order to guide construction and identify the key points for tunnel con- struction monitoring, a study on the pre-reinforcement effect of horizontal jet grouting piles and the law of tunnel structure displacement was performed using the 3D elasto-plastic finite element method. Study results show that with reinforcement with horizontal jet grouting piles, compared to construction with no horizontal jet grouting piles, the final settlement of the arch crown was reduced by 63.45%, the longitudinal displacement of the tunnel face was decreased by 69.6% and the plastic strain area of the tunnel face was reduced dramatically. The pre-reinforcement by horizontal jet grouting piles effectively controls the deformation and has a remarkable reinforcement effect.
出处
《现代隧道技术》
EI
CSCD
北大核心
2016年第5期168-175,共8页
Modern Tunnelling Technology
基金
陕西省科技厅工业科技攻关项目(2015GY185)
关键词
隧道
强风化花岗岩
水平旋喷桩
数值模拟
位移
塑性应变
Tunnel
Strong weathered granite stratum
Horizontal jet grouting piles
Numerical simulation
Dis-placement
Plastic strain
