摘要
岩溶地区岩体裂隙发育、溶蚀管道众多。在暴雨条件下受地表水补给影响,在役隧道顶部溶洞内水位快速升高,导致衬砌结构发生失稳破坏,严重影响行车安全。针对依托工程的地质条件,采用理论分析方法建立了圆形衬砌断面的顶部局部高水压与围岩压力联合作用下的内力计算模型,基于Mathematica编程进行了不同水压力大小和不同水压力作用面积下隧道衬砌结构的受力计算分析。结果表明:随着拱顶水压力值或水压作用面积的增大,位移/弯矩零点角度的大小均呈非线性变化,位移零点变化比弯矩零点变化明显,位移零点均非线性增大,弯矩零点则减小;拱顶和边墙的位移值均呈线性增大,拱顶增幅大于边墙增幅;负弯矩出现在拱顶和仰拱处,正弯矩出现在边墙处,其中拱顶弯矩增幅最大,边墙和仰拱处弯矩增幅几乎一致。
In the karst area,there are many cracks in the rock mass and many dissolved pipelines. Under heavy rain conditions,affected by the recharge of surface water,the water level in the karst cave or fissure on the top of the tunnel in service rises rapidly,resulting in structural instability of the tunnel lining structure under the action of local high water pressure on the vault,which seriously affects driving safety. According to the geological conditions of the project,the theoretical analysis method is used to establish the internal force calculation model under the combined action of the local high water pressure at the top of the circular lining section and the surrounding rock pressure. Based on Mathematica progra mming,different water pressures values and acting areas are performed to calculate and analyze the force of the tunnel lining structure under the area. The results show that with the increase of the water pressure value of the vault or the hydraulic pressure area, the magnitude of the displacement/bending moment zero point angle changes nonlinearly,the displacement zero point changes more obviously than the bending moment zero point,and the displacement zero point increases nonlinearly. The displacement values of the vault and the side wall increase linearly,and the zero point of the bending moment decreases;and the increase of the vault is greater than the increase of the side wall;the negative bending moment appears at the vault and invert,and the positive bending moment appears at the side wall. Among them,the bending moment of the vault has the largest increase,and the increase of the bending moment at the side wall and the invert is almost the same.
作者
金美海
刘新荣
钟祖良
Jin Meihai;Liu Xinrong;Zhong Zuliang(School of Civil Engineering,Chongqing University,Chongqing 400045,P.R.China;National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas,Chongqing 400045,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2021年第4期1099-1105,1131,共8页
Chinese Journal of Underground Space and Engineering
基金
重庆市科委自然科学基金基础与前沿研究计划项目(cstc2013jcyjA30005)。
关键词
岩溶隧道
高水压
衬砌结构
内力计算
karst tunnel
high water pressure
lining structure
internal force calculation
