摘要
为深入分析非饱和黄土基质吸力变化与隧道病害之间的内在联系,结合大有山隧道的工程实例,利用非饱和黄土数学模型分析、等围压变吸力剪切试验、现场监测等手段对非饱和黄土基质吸力的变化规律及其对隧道支护力、塑性区的影响进行研究.结果表明:非饱和黄土基质吸力随着含水量的增加而减小时,隧道内部所需支护力则随之增大,塑性区半径也随之增大;由于受地表水下渗影响,大有山隧道周围土体基质吸力减小,导致其发生拱顶下沉、塌方及衬砌开裂等病害;大有山隧道病害治理的首要任务在于保持隧道排水系统的顺畅,并做好地表水的堵、截及隧道洞身的防水.
In order to analyze the internal relationship between the matric suction change and the tunnel disease, taking the Dayoushan tunnel as an engineering example, using the mathematical model analysis, shear test and field monitoring, the change law of the martie suction and the influence of martie suction on the tunnel supporting force and plastic zone are studied. The results show that when the unsaturated loess matric suction decreases with the increase of water content, the supporting force required the inside of tunnel is in- creasing and the radius of plastic zone is also increasing. Due to the influence of surface water infiltration, the matric suction of the sur- rounding soil in Dayoushan tunnel reduces, which results in the diseases such as the crown settlement, landslides and lining cracks, etc. The disease treatment mainly lies in keeping the drainage system smooth and blocking and cutting the surface water, and doing wa- terproof of tunnel body well.
出处
《华北水利水电学院学报》
2013年第6期64-68,共5页
North China Institute of Water Conservancy and Hydroelectric Power
基金
山西省交通运输厅科技项目(2013-1-3)
关键词
非饱和黄土隧道
基质吸力
模型分析
剪切试验
隧道病害
处治措施
unsaturated loess tunnel
matrie suction
model analysis
shear test
tunnel disease
prevention measure
