Abstract
Aimed at the failure of ancient city wall ruins induced by heavy rainfall, the numerical model of the typical wall section of Zheng Han ancient city wall ruins is generalized. Based on the software of ABAQUS, the variation regularity of pore water pressure, saturation and seepage velocity in ancient city wall ruins under the influence of different rainfall elements and structure characteristics is discussed. The results show that the dynamic process of pore water pressure in the wall (the rate of change and the range) is directly proportional to the unit rainfall intensity. Under the same rainfall intensity, the pore water pressure on the wall surface with larger initial substrate suction increased faster than the wall surface with smaller initial substrate suction. Within the depth range of rainfall influence, the rate of water infiltration into the interior of the wall body decrease from the wall surface to the depth of the wall. At the same section of the wall, the growth rate of saturation at the platform is significantly higher than that in the wall region with larger slope angle; with the increase of saturation, the growth rate slows down.
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