摘要
地下综合管廊是将几种不同管线放置其中并为维修而提供充足空间的一种公共基础设施。由于地下综合管廊在提高项目可靠性、减轻维修成本、改善环境方面的优势,已成为未来城市地下基础设施建设的发展方向。目前很多地下结构的研究主要关注于地震荷载对结构产生的内力和变形,但对于可液化土中地下结构的地震反应分析,尤其是可液化土中浅埋地下综合管廊的分析仍然缺乏。利用FLAC软件对地下综合管廊在地震荷载作用下土体液化后的加速度、超孔压比、土体表面位移及管廊变形、结构内力变化等特性进行了模拟。结果表明,土体液化后产生明显的侧向剪切变形和上浮位移导致地下综合管廊也产生较大的侧向和上拔位移,说明了考虑土体液化与地下综合管廊动力相互作用分析方法的有效性,初步揭示了可液化土中浅埋地下综合单仓管廊的动力特性,可为设计所参考。
A utility tunnel is a public underground structure that holds wires,conduits,pipes of power,gas,water supply and communication utility system and provides also enough space for maintenance. Construction of the utility tunnel represents the future orientation of development for underground infrastructure system in both cities and small towns because of its many advantages as improving the project reliability,lessening maintenance cost and improving the environment. At present,many studies have focused upon the effects of earthquake loading on the intermal forces and displacements of underground structures,while the seismic response analysis of underground structure in liquefiable soil,especially to shallow utility tunnel is still lacking. The FLAC software has been used to model the soil acceleration response,excess pore pressure ration changes,ground surface deformation and lateral deformation,internal forces changes of utility tunnel characteristics during earthquakes that lead to soil liquefaction. The results show that soil liquefaction caused obvious horizontal shear deformation and float displacement,which resulted in that the utility tunnel also had a greater lateral and uplift deformation. The analysis illustrates the effectiveness of the approach considering the soil liquefaction and soil-structure interaction,and preliminarily reveals the dynamic characteristics of the shallow utility tunnel in liquefied soil,which can be used for design reference.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第S1期1762-1769,共8页
Chinese Journal of Underground Space and Engineering
基金
上海市科学技术委员会资助项目(13XD1423000)
关键词
地下综合管廊
地震响应分析
液化
数值模拟
utility tunnel
seismic response analysis
liquefaction
numerical modeling
