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西安明城墙是由内芯土和外包墙组成的人工黄土边坡。强度折减有限元法是分析土坡稳定性、确定土坡最小安全系数的有效方法,但应用该方法计算城墙的安全系数时,却难以处理外包墙上的潜在破坏面对城墙稳定性的影响。根据外包墙破坏的实际情况,假设了不同形式和位置的潜在破坏面来模拟外包墙的破坏形态,通过考虑软化性能的界面本构方程,应用强度折减有限元法确定了外包墙的最危险破坏形态,并基于此破坏形态研究了影响城墙稳定性的主要因素,可为古城墙的稳定性评估和保护修缮提供依据。分析表明,城墙内芯土潜在滑动弧可简化为一条直线,其顶点位于坡肩内约3m处;城墙沿该滑动弧的安全系数满足稳定性要求;外包墙的破坏形态和砂浆强度、外包墙与内芯土之间的摩擦系数是影响城墙变形破坏的主要因素。
Xi’an Ming City wall is composed of the inner core and the outer wall of artificial loess slope. Strength reduction finite element method is an effective method to analyze the stability of soil slope and determine the minimum safety factor of soil slope. However, when this method is used to calculate the safety factor of a city wall, it is difficult to deal with the influence of potential damage surface on the stability of the city wall . According to the actual situation of the destruction of the outer wall, the potential failure surface of different forms and locations is assumed to simulate the failure mode of the outer wall. By considering the interface constitutive equation of the softening performance, the strength reduction finite element method is used to determine the most dangerous Destroy the form, and study the main factors influencing the stability of the city wall based on the damage form, which can provide the basis for the stability assessment and the protection and repair of the ancient city wall. The analysis shows that the latent sliding arc of the core and soil in the city wall can be simplified to a straight line with the apex located about 3m within the slope; the safety coefficient of the city wall along the sliding arc meets the stability requirements; the failure mode and the strength of the mortar wall, The coefficient of friction with the inner core soil is the main factor that affects the deformation and destruction of the wall.