摘要
以福建省三明市莆炎高速公路布盂隧道工程为依托,通过采用Midas GTS有限元软件建立数值模型分析了强降雨和隧道施工开挖条件下隧道洞口坡面稳定性,对隧道塌方机理进行了研究。结果表明,浅埋偏压隧道花岗岩残积土强度低,遇水软化,短期强降雨条件下,土层界面位置含水差异大,易产生坡面滑坡事故;浅埋偏压隧道开挖,容易扰动上覆偏压地层,短期强降雨不利条件下,隧道施工对土层的扰动加剧坡面塌方事故的发生;通过设置仰斜式排水孔、加大边仰坡锚喷面积稳定坡面地层,可有效地处治洞口坡面塌方,为后期类似洞口塌方处治提供了较好的借鉴。
Based on the Buyu Tunnel Project of Puyan highway in Sanming City,Fujian province,the numerical model is established by Midas GTS finite element software to analyze the slope stability of tunnel portal under the condition of heavy rainfall and tunnel excavation,to find out the mechanism of tunnel portal collaps.The results show that the strength of granite residual soil layer of shallow buried bias tunnel is low and softens when exposed to water.Under the condition of short-term heavy rainfall,the water content difference at soil interface is large,which is easy to cause slope landslide accidents.The excavation of shallow bias tunnel is easy to disturb the overlying strata.In addition,under the condition of short-term heavy rainfall,tunnel construction will disturb soil layer and aggravate slope collapse accidents.By setting up inclined drainage holes and increasing the area of bolting and shotcreting on slope,the slope strata is stabilized and the collapse at portal is effectively treated,which has a good reference for the treatment of similar portal collapse in later period.
作者
毕志刚
BI Zhigang(China Railway 15th Bureau Group 1st Corporation Limited,Xi'an 710018,China)
出处
《中原工学院学报》
CAS
2022年第3期33-40,共8页
Journal of Zhongyuan University of Technology
基金
国家自然科学基金项目(U1604135)
中铁十五局集团有限公司重点科研项目(2018B4)
河南省科技厅产学研合作项目(2015HNCXY011)。
关键词
浅埋偏压
大断面隧道
洞口塌方
数值模拟
处治措施
shallow-buried and biased
large section tunnel
collapse at portal
numerical simulation
collapse treatment
