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Title:: Disease Characteristics and Dynamic Test Analysis of Jiaohe Ancient City

作者:: 李桐林¹; 石玉成^1; 刘琨¹; 2; 卢育霞¹; 2; 王常亚¹; 缐正英¹; (1.中国地震局兰州地震研究所,甘肃兰州 730000; 2.中国地震局(甘肃省)黄土地震工程重点实验室,甘肃兰州 730000)

Author(s):: LI Tonglin¹; SHI Yucheng¹; LIU Kun¹; 2; LU Yuxia¹; 2; WANG Changya¹; XIAN Zhengying¹; (1.Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,Gansu,China)(2.Key Laboratory of Loess Earthquake Engineering,Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,Gansu,China)

Keywords:: the Jiaohe Ancient City; disease characteristics; reinforcement method; dynamic test; amplification effect

摘要:: 介绍了交河故城存在的风蚀、雨蚀、掏蚀、裂隙和崩塌等主要病害类型,总结其现有加固方式,并对典型遗址体进行地脉动测试,结果显示:①土遗址的自振频率主要在1.72～6.03 Hz,阻尼比主要在0.027～0.043,符合实际情况; ②墙体相对于塔体墩台的自振频率较大,受地震作用影响较大,应对交河故城居民墙、佛寺墙等薄弱墙体进行重点监测与保护; ③地脉动由底部传至顶部,其速度存在明显放大效应,放大倍数约为1.5～3倍。

Abstract:: This paper introduces the main types of diseases such as wind erosion,rain erosion,erosion,fissures and collapse in the Jiaohe Ancient City,summarizes its existing reinforcement methods,and conducts pulsation tests on typical sites.The results show that:①The natural frequency of the earth ruins is mainly between 1.72～6.03 Hz,and the damping ratio is mainly between 0.027～0.043,which is in line with the actual situation.②The natural frequency of the wall is larger than that of the pier of the tower,and it is greatly affected by the earthquake.Weak walls such as residential walls and Buddhist temple walls in Jiaohe Ancient City should be monitored and protected intensively.③The ground pulsation is transmitted from the bottom to the top,and its speed has obvious amplification effect,and the magnification is about 1.5～3 times.