摘要
以青岛海底隧道试验段为工程背景,基于流固耦合理论对海底隧道初期支护安全性的影响因素进行分析,结论表明:(1)注浆加固显著改善了洞周土体强度和整体性,塑性区范围得到有效控制;(2)注浆加固优化了支护结构的受力,随着加固圈厚度的增加,洞周位移出现不同程度的衰减,加固圈厚度对减小水压的贡献依次为:拱顶>拱腰>拱脚>仰拱;(3)随着加固圈渗透系数的增大,洞周水压力随之增大;(4)在流固耦合作用下,仰拱处的土压力远大于其他部位;(5)现行支护参数条件下,海底隧道初期支护结构满足安全性要求,现场实测与数值计算基本相符。
With reference to Jiaozhouwan subsea tunnel in Qingdao and based on the coupled fluid-solid theory, the impact factors are studied on initial support safety in subsea tunnel. The results show that:(1)The strength and integrity of surrounding rock are improved significantly by grouting reinforcement and the plastic zone is effectively controlled; ( 2 ) The force of the supporting structure is optimized by grouting reinforcement ring, with the increase of the reinforcement thickness, the displacement attenuates in a certain degree, and the thickness of the reinforced ring contributes to the reduction of water pressure in such a sequence: arch top to arch web to arch foot to inverted arch; ( 3 ) With the increase of the permeability coefficient of reinforced ring, the water pressure around the tunnel is increasing;( 4 ) The earth pressure at the inverted arch is much bigger than anywhere else under couple fluid-mechanical;(5)The initial support structure meets the requirement for safety with the current support parameters, and the site measurements agree basically with the numerical calculations.
出处
《铁道标准设计》
北大核心
2015年第1期86-90,共5页
Railway Standard Design
基金
国家杰出青年科学基金项目(51108020)
关键词
海底隧道
初期支护
安全性
注浆加固
流固耦合
Sub-sea tunnel
Initial Support
Safety
Grouting reinforcement
Couple fluid-mechanical