双线小净距隧道正下穿高压电塔影响研究

Study on infl uence of double track tunnel with short clear distance passing through high-voltage tower

城市地铁双线小净距隧道下穿高压电塔,施工风险较高,研究盾构隧道近距离穿越高压电塔影响,对于保证施工过程中高压电塔及区间隧道安全稳定具有重要意义。文章以岩石地层小净距盾构区间下穿南吴线66kV高压电塔为背景,通过数值分析计算,模拟盾构下穿高压电塔施工工况,对高压电塔基础沉降进行计算分析,将计算值与地表监测值进行对比,验证计算结果,最终双线净距仅2.8m的2条隧道安全顺利通过高压电塔。

The construction risk of urban subway double track short clear distance tunnel under highvoltage tower is high.It is of great significance to study the infl uence of shield tunnel passing through high-voltage tower in short distance to ensure the safety and stability of high-voltage tower and section tunnel during construction.Taking the 66 kV highvoltage tower of Nanwu line under the shield interval with small clear distance in rock stratum as a study case,through numerical analysis and calculation,this paper simulated the construction condition of shield tunneling under high-voltage tower,and calculates and analyzes the foundation settlement of highvoltage tower.The calculated value is compared with the surface monitoring value,and the calculation result is verifi ed.In conclusion,the two tunnels with a clear distance of only 2.8 m pass through the highvoltage tower safely and smoothly.