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Analysis and Numerical Calculations of Stability on Ancient City Wall under Various Sapping Depths

ZHANG Ming-quan1,MA Ke-jing1,LIU Can2,Xue Li-yang1,ZHANG Lin1,Wang Xu-dong3(1.School of Resources and Environmental Sciences,Lanzhou Unviersity,Lanzhou,Gansu 730000,China; 2.School of civil Engineering and Mechanics,Lanzhou Unviersity,Lanzhou,Gansu 730000,China; 3.Dunhuang Academy,Dunhuang,Gansu 736200,China)  
The width of the top of the ancient city wall in Liangzhu,which is known as the first city in China,reaches 40~60 m;stability issues for this wall have been identified.Finite differences determined through FLAC3D software were considered to build a calculation model for examining failure laws and the mechanism of the ancient city wall under various sapping depths.The results show that when the sapping depth is not sufficiently large,the entire city wall is stable,and local plastic failure occurs near the sapping location.When the depth of sapping increases,the plastic failure area becomes wider and deeper and can reach the top of the wall.In addition,the soil displacement increases until the entire wall slides.The sapping contributes to the damage of the wall,a potential slide opening appears in the sapping area,and a plastic area appears in the wall,which leads to sliding of the entire wall.
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