摘要
针对翠屏山隧道与翠屏山煤矿巷道交叉段的特殊工况,分析新建隧道施工对围岩和煤矿巷道变形和应力的影响,通过有限元数值模拟验证现场施工工法的可靠性。研究结果表明:隧道开挖引起下方巷道拱顶最大沉降量为4.6 mm,仰拱最大隆起量为0.7 mm;新建隧道开挖产生卸荷作用,巷道顶部受到上部土体的约束而产生压应力,最大主压应力为1.85 MPa;隧道开挖前后最大主应力变化比例值最大值为42%,位于新建隧道与既有煤矿交叉处;近接隧道施工时,交叉段内地质条件较差时,采用双侧壁导坑法施工,隧道开挖引起的围岩变形量较小,施工方法较合理。
According to the special working conditions of the crossing section of Cuipingshan Tunnel and Cuipingshan Coal-mine Roadway,the effects of new tunnel construction on the deformation and the stress of surrounding rocks and coal-mine roadways were analyzed.The reliability of on-site construction method was verified by finite element numerical simulation.Results show that the maximum settlement of the tunnel roof caused by tunnel excavation is 4.6mm,and the maximum uplift of the inverted arch is 0.7mm.The excavation of the new tunnel creates an unloading effect,and the top of the roadway is constrained by the upper soil to generate a compressive stress and the maximum principal compressive stress is 1.85 MPa.The maximum value of the maximum principal stress change before and after tunnel excavation is 42%,which is located at the intersection of the newly built tunnel and the existing coal-mine.In the construction of adjacent tunnels,when the geological conditions in the intersection are poor,the double-side heading method is adopted,and the deformation of the surrounding rock caused by tunnel excavation is small,which proves that the construction method is reasonable.
作者
林礼华
LIN Lihua(Fujian Communications Planning&Design Institute CO.,LTD,Fuzhou 350004,China)
出处
《福建工程学院学报》
CAS
2019年第4期326-330,共5页
Journal of Fujian University of Technology
关键词
交叉隧道
围岩应力
巷道变形
施工方法
Midas/GTS
NX软件
intersecting tunnel
stress of surrounding rocks
roadway deformation
construction method
Midas/GTS NX software
