夯土长城墙体掏蚀失稳机理研究
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摘要
基于明代夯土长城甘肃山丹段的野外现场调查和室内试验建立了夯土长城掏蚀墙体稳定性分析模型和动力时程分析模型,计算分析了夯土墙体在自重和地震作用下墙体的稳定系数和动力响应规律。结果表明:在自重作用下掏蚀墙体稳定系数是掏蚀深度的二次函数,山丹段墙体在自重作用下处于稳定状态,墙体最大掏蚀深度为0.778 m;山丹段墙体掏蚀深度小于极限掏蚀深度,仍能抵御8度地震作用;夯土墙体峰值加速度最大值出现在墙体掏蚀部位顶侧,比墙根峰值加速度大1.28倍。本文研究成果可为河西地区土遗址保护提供参考。
Based on the filed study on the rammed Great Wall made in Ming Dynasty at Shandan section in Gansu province and lab test,the stability analysis model of sapping rammed wall and dynamical time-history analysis modle are built,in which the stability coefficient and dynamic response of the rammed wall under the self-weight and seismic action is researched.The results show that:(1)the stability coefficient of sapping wall is quadratic function of sapping depth under self-weight action,the wall in Shandan section under geostatic stress is in a stable state,and the maximum sapping depth is 0.778 m.(2)If sapping depth of the wall in Shandan is less than the maximum sapping depth,the wall is safe underⅧ degree of seismic intensity.(3)The maxmium PGA of rammed wall is on the top of sapping foot;that is 1.28 times larger than the one at the foot of the wall.The study results can provide reference for the protection of earthen ruin in the northwest of china.
Based on the filed study on the rammed Great Wall made in Ming Dynasty at Shandan section in Gansu province and lab test,the stability analysis model of sapping rammed wall and dynamical time-history analysis modle are built,in which the stability coefficient and dynamic response of the rammed wall under the self-weight and seismic action is researched.The results show that:(1)the stability coefficient of sapping wall is quadratic function of sapping depth under self-weight action,the wall in Shandan section under geostatic stress is in a stable state,and the maximum sapping depth is 0.778 m.(2)If sapping depth of the wall in Shandan is less than the maximum sapping depth,the wall is safe underⅧ degree of seismic intensity.(3)The maxmium PGA of rammed wall is on the top of sapping foot;that is 1.28 times larger than the one at the foot of the wall.The study results can provide reference for the protection of earthen ruin in the northwest of china.
引文
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[2]罗哲文.长城[M].北京:清华大学出版社,2008:47-57,100-102,17-180.
[3]赵海英,李最雄,韩文峰,等.西北干旱区土遗址的主要病害及成因[J].岩石力学与工程学报,2003,22(增2):2875-2880.
[4]郭宏.文物保存环境概论[M].北京:科学出版社,2001.
[5]孙满利,李最雄,王旭东.干旱地区土遗址病害分类研究[J].工程地质学报,2007,15(6):772-779.
[6]李并成.敦煌境内的长城和古城遗址[M].甘肃:甘肃人民出版社,2000:10-15.
[7]赵明霞.浅谈土遗址加固保护的措施[J].山西建筑,2008,34(8):144-145.
[8]刘琨,石玉成,卢育霞.玉门关段汉长城结构抗震性能研究[J].世界地震工程,2010,26(1):161-167.
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