特殊荷载作用下电力电缆隧道结构内力计算

Structure Inner Force Analysis of Electric Cable Tunnel under Special Loads

结合上海输电隧道工程实际,对其在内、外部荷载共同作用下的结构内力进行分析和计算,提出了盾构法施工条件下的电力隧道结构内力计算模式.结果表明:在盾构法施工条件下,适宜采用带有旋转弹簧及剪切弹簧接头的弹性地基圆环模型,以体现内部荷载施加前后管片内力的变化情况;横梁可使圆环水平变形减小,总体受力得到改善;横隔板及内部荷载可使管片轴力增加,横梁中部及两端弯矩增大,该处节点设计应尽量做到安全可靠,并做好连接点构造处理;横梁与衬砌结合部可产生应力集中,使得上部管片弯矩减小,下部管片弯矩增大,铰单元承受的弯矩减小.

The use of the electric cable tunnel is different from that of metro tunnel,and also its inner loads.Based on Shanghai electric tunnel project,the structure inner force under inner and out loads was analyzed,and the calculating model should be used that have the ability to deal with changeable structure and varying loads.The analysis results show that,after the assembly of the cross beam and under corresponding inner loads,the axial force of shield tunnel segment increases;and the segment moment decreases in upper part,but increases in lower part;the moment that joint element bears decreases.