高填渠道面板内力分布特征与分缝优化研究

Research on Internal Force Distribution Characteristics and Seam Optimization of High-fill Channel Faceplate

依托某高填方渠道工程项目,借助有限元分析软件,研究了渠道工后沉降影响下衬砌面板内力分布特征及控制因素,并探究了分缝对面板内力分布特征的影响规律。结果表明:工后沉降过程中的面板内力分布受面板不均匀挠度变形和坡面与面板之间的摩擦力共同交替控制,靠坡底的面板为主受压区,其内力主要由坡面对面板的摩擦力所控制,靠坡顶的面板为主受拉区,其内力主要由面板不均匀挠曲变形所控制;于面板受拉区进行分缝处理,将会增大面板拉应力水平,对面板的受力状态不利,若在面板受压区进行分缝处理,将会改变由工后沉降引起面板的内力分布,增大面板受压区范围,充分发挥混凝土面板抗压性能强的优点,有效降低面板受拉开裂的风险。

Relying on a high fill channel engineering project,with the help of finite element analysis software,the distribution characteristics and control factors of the internal force of the lining faceplate under the influence of post-construction settlement of the channel were studied.In addition,the influence law of the seam on the distribution characteristics of the faceplate internal force was explored.The results show that the internal force distribution of the faceplate during post-construction settlement is controlled alternately by the uneven deflection of the faceplate and the friction between the slope and the faceplate.The faceplate near the bottom of the slope is the main compression area,and its internal force is mainly controlled by the friction force of the slope on the faceplate.However,the faceplate near the top of the slope is the main tension area,and its internal force is mainly controlled by the uneven deflection of the faceplate;the seam treatment in the tensile area of the faceplate will increase the tensile stress level of the faceplate,which is unfavorable to the stress state of the faceplate.If the seam treatment is performed in the faceplate compression area,the internal force distribution of the faceplate caused by post-construction settlement will be changed,and the range of the faceplate compression area will be increased.On the one hand,it gives full play to the advantages of strong compressive performance of concrete faceplates,and on the other hand effectively reduces the risk of faceplate cracking under tension.