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紫禁城为我国重点文物保护单位,但紫禁城城墙目前出现较大病害。本文利用数值模拟分析的技术手段,对病害城墙在天然、连续降雨及地震等不利条件下的变形特征进行了分析,分析了不同工况下城墙最大变形位置、最大剪应力以及地震作用力对城墙的破坏影响。发现城墙与地面交界处、城墙墙体与夯土交接处两处位置最易发生剪切破坏;地震作用下最大竖向位移位于孔洞处,且内部空洞位置产生较大水平振动速度,在地震中较易发生破坏。这些结论可为紫禁城城墙的保护和修缮提供理论依据。
The Forbidden City is a key cultural relic protection unit in China, but there are currently major diseases in the Forbidden City wall. In this paper, the numerical analysis of the technical means to analyze the deformation characteristics of the urban wall under the adverse conditions of natural, continuous rainfall and earthquakes, analysis of the maximum deformation location of the wall under different conditions, the maximum shear stress and seismic forces on the wall Destruction effect. It is found that the shear damage is most likely to occur at two locations of the junction of the wall and the ground and between the wall of the wall and the rammed earth. The maximum vertical displacement under the earthquake is located at the hole and a large horizontal vibration velocity occurs at the location of the internal cavity. More prone to damage. These conclusions can provide a theoretical basis for the protection and repair of the Forbidden City wall.