下穿高压输电塔大跨度隧道结构监测中传感器的应用

摘要

In order to ensure safe operation of overlying high-voltage power transmission tower,it must master ground disturbance conditions and forces of supporting structures caused by construction of underpass tunnel. According to field measurements of Lijiachong tunnel which is located beneath a 500 kV high-voltage power transmission tower,relevant monitoring plan and monitoring results are introduced. Monitoring results show that the deformation of surrounding rock tend to be stable during tunnel construction,and safety factors of steel arch support and concrete secondary lining are satisfied with requirement of standard,which proves that construction scheme of tunnel is reasonable,structure is stable and reliable,and sensors can complete relevant monitoring task effectively.%为了保证上覆高压输电塔的安全正常运行，必须要掌握下穿隧道施工对地层的扰动和支护结构的受力情况。结合李家冲隧道下穿500kV高压输电塔实体工程的现场监控量测，介绍了相关监测方案及其监测结果。结果显示：隧道施工过程中，围岩变形趋于稳定，钢拱架和二衬内力的安全系数均满足设计规范要求，说明隧道施工方案合理，工程结构稳定可靠，所用传感器有效完成相关监测任务。