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南京明城墙作为世界上目前残存规模最大的古城墙,其文物保护价值不言而喻。鼓胀作为一种常见损伤类型对城墙的危害极大,鼓胀主要是由温度、降雨等因素作用引起的。结合龙脖子段城墙,对温度和降雨的影响机理进行简化,考虑温度变化,并将降雨简化为复合墙体强度指标的下降及雨水渗入砖土接触面所产生的附加水压力的影响,采用非线性有限元软件ABAQUS进行计算分析,得出了温度和降雨对鼓胀的量化影响,并与现场实测鼓胀成果数据进行对比,发现二者趋势及量值基本一致。
Nanjing Ming City Wall as the remnants of the world’s largest ancient city wall, its heritage conservation value is self-evident. Bulging as a common type of damage on the walls of great harm, bulging mainly caused by temperature, rainfall and other factors. Combined with the wall of Longzhangzi section, the influence mechanism of temperature and rainfall is simplified. Considering the change of temperature, the rainfall is reduced to the decrease of strength index of composite wall and the influence of additional water pressure caused by the infiltration of rainwater into the brick-soil interface. Linear finite element software ABAQUS is used for calculation and analysis. The quantitative effect of temperature and rainfall on bulging is obtained and compared with the data of actual measured bulging results. The trend and the value of the two are basically the same.