摘要
临江防洪古城墙为夯土城墙,服役期间常遭遇台风。选择典型城墙结构进行渗流安全分析,研究墙体在经历洪水时是否存在隐患。采用非饱和渗流有限元法,分析城墙在经历高洪水位和暴雨耦合工况时的渗流性态,并开展材料参数、洪水位和暴雨强度的敏感性分析。结果表明,当填土结构较为松散时,夯土自身稳定性较差,在暴雨及洪水工况下,易对城墙结构整体安全产生不利影响;当填土结构松散而砌石结构完整时,其渗流安全有较大改善;当顶部防渗失效,降雨大量入渗,容易导致墙顶中部沉陷,两边砌石体承受较大压力将影响边坡稳定。建议在夯土古城墙的维修加固工作中保证内部填土夯实质量,提升城墙边坡砌石质量,确保墙顶和边坡防渗的有效性。
A riverside ancient city wall is an internal rammed soil city wall,which always met with typhoons during its operation.A typical wall structure is selected for seepage safety analysis to study whether there are hidden dangers in the wall during flood.The unsaturated seepage finite element method is used to analyze the seepage behavior of the wall under the coupling condition of high flood level and cloudburst,basing on this foundation,sensitivity analysis of material parameters,flood level and rainstorm intensity were carried out.The results show that when the filling structure was relatively loose,the stability of rammed earth was poor.In the case of rainstorm and flood,it was easy to adversely affect the overall safety of the wall structure.When the filling structure was loose but the outer brick masonry structure was intact,the seepage safety would improve greatly.When the anti-seepage failure on the wall top,coupling with a large amount of rainfall infiltration,which easily led to the subsidence at middle of wall roof,then both sides of the outer brick masonry under greater pressure will reduce the stability of the slope.It is suggested that in the maintenance and reinforcement of rammed earth ancient city wall,the quality of both the rammed earth inside the ancient city wall and the outer brick masonry should be improved,and the anti-seepage effectiveness of the wall top and the slope should be guaranteed.
作者
邱莉婷
齐翠阁
俞扬峰
QIU Liting;QI Cuige;YU Yangfeng(Nanjing Hydraulic Research Institute,Nanjing Jiangsu 210029,China;Shimantan Reservoir Administration of Henan Province,Wugang Henan 462500,China)
出处
《工程质量》
2022年第12期52-56,61,共6页
Construction Quality
关键词
古城墙
内夯土
包边砖石
防洪
渗流稳定
敏感性分析
ancient city wall
internal rammed soil
outer brick masonry
flood control
seepage safety
sensitivity analysis
