汶川震区路肩墙抗震能力检算与震害机理分析
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摘要
在汶川地震路肩墙震害调查基础上,根据设计图纸,按规范对路肩墙进行抗震能力检算和震害机理分析,获得以下结论:由于现行公路规范中有关规定表明地震工况时公路挡土墙稳定性验算不考虑车辆荷载,故按现行公路规范要求设计的挡土墙具有抵抗8度地震的抗震能力;9度地震烈度区路肩墙倾斜变形的原因是挡墙基底应力超过基底容许承载力值;10度地震烈度区路肩墙严重倾斜变形及出现毁坏现象的原因是抗倾覆稳定系数不满足规范要求和挡墙基底应力远远超过基底容许承载力值,碎石土基路肩墙还有抗滑动稳定系数不足的原因;现行公路规范中挡土墙稳定安全系数取值合理,在9度地震烈度区是适用的,并且可以延伸到10度地震烈度区。
Seismic damage of the shoulder retaining wall was investigated in Wenchuan earthquake.According to design drawing and specification,the seismic resistance behavior of the shoulder retaining wall was checked and the seismic damage mechanism was analyzed.The conclusions were as follows: firstly,relevant regulations in the current highway codes showed that the vehicle load wasn't considered when checking the stability of highway retaining wall,therefore the retaining wall designed based on the current highway codes could resist 8 degree earthquake.Secondly,the reason of the shoulder wall's inclination distortion in 9 degree earthquake zone was that the foundation stress went beyond the bearing capacity.Thirdly,the cause of the shoulder wall's serious inclination distortion and collapse in 10 degree earthquake zone was that the toppling stability coefficient didn't satisfy requirements of the codes and the foundation stress went beyond the bearing capacity.Lastly,the stability safety factors value of retaining walls in the current highway codes was reasonable;it was applicable in 9 degree earthquake intensity zone and could be extended to 10 degree earthquake intensity zone.
Seismic damage of the shoulder retaining wall was investigated in Wenchuan earthquake.According to design drawing and specification,the seismic resistance behavior of the shoulder retaining wall was checked and the seismic damage mechanism was analyzed.The conclusions were as follows: firstly,relevant regulations in the current highway codes showed that the vehicle load wasn't considered when checking the stability of highway retaining wall,therefore the retaining wall designed based on the current highway codes could resist 8 degree earthquake.Secondly,the reason of the shoulder wall's inclination distortion in 9 degree earthquake zone was that the foundation stress went beyond the bearing capacity.Thirdly,the cause of the shoulder wall's serious inclination distortion and collapse in 10 degree earthquake zone was that the toppling stability coefficient didn't satisfy requirements of the codes and the foundation stress went beyond the bearing capacity.Lastly,the stability safety factors value of retaining walls in the current highway codes was reasonable;it was applicable in 9 degree earthquake intensity zone and could be extended to 10 degree earthquake intensity zone.
引文
[1]《汶川地震灾害地图集》编纂委员会.汶川地震灾害地图集[M].成都:成都地图出版社,2008.
[2]姚令侃,陈强.5.12汶川地震对线路工程抗震技术提出的新课题[J].四川大学学报:工程科学版,2009,41(3):43-50.
[3]姚令侃,冯俊德,杨明.汶川地震路基震害分析及对抗震规范改进的启示[J].西南交通大学学报,2009,44(3):301-311.
[4]冯俊德,姚令侃,王智猛.汶川地震强震区路基工程震害模式与分析[C]//汶川大地震工程震害调查分析与研究.北京:科学出版社,2009:630-637.
[5]杨雪莲,周永江,吴事贵,等.汶川地震区公路挡墙破坏分析及设计中有关问题的探讨[J].资源环境与工程,2009,23(S1):85-87.
[6]何义宏.高烈度地震区公路路肩挡土墙震害调查与分析[J].公路交通科技:应用技术版,2009(4):109-110.
[7]何义宏.紫坪铺水库左岸重载公路挡土墙震害调查分析[J].路基工程,2009(3):192-193.
[8]GB 50111—2006铁路工程抗震设计规范[S].北京:中国计划出版社,2006.
[9]JTJ004—89公路工程抗震设计规范[S].北京:人民交通出版社,1990.
[10]JTG D30—2004公路路基设计规范[S].北京:人民交通出版社,2004.
[11]交通部第二公路勘察设计院.公路设计手册:路基[M].2版.北京:人民交通出版社,2001.
[2]姚令侃,陈强.5.12汶川地震对线路工程抗震技术提出的新课题[J].四川大学学报:工程科学版,2009,41(3):43-50.
[3]姚令侃,冯俊德,杨明.汶川地震路基震害分析及对抗震规范改进的启示[J].西南交通大学学报,2009,44(3):301-311.
[4]冯俊德,姚令侃,王智猛.汶川地震强震区路基工程震害模式与分析[C]//汶川大地震工程震害调查分析与研究.北京:科学出版社,2009:630-637.
[5]杨雪莲,周永江,吴事贵,等.汶川地震区公路挡墙破坏分析及设计中有关问题的探讨[J].资源环境与工程,2009,23(S1):85-87.
[6]何义宏.高烈度地震区公路路肩挡土墙震害调查与分析[J].公路交通科技:应用技术版,2009(4):109-110.
[7]何义宏.紫坪铺水库左岸重载公路挡土墙震害调查分析[J].路基工程,2009(3):192-193.
[8]GB 50111—2006铁路工程抗震设计规范[S].北京:中国计划出版社,2006.
[9]JTJ004—89公路工程抗震设计规范[S].北京:人民交通出版社,1990.
[10]JTG D30—2004公路路基设计规范[S].北京:人民交通出版社,2004.
[11]交通部第二公路勘察设计院.公路设计手册:路基[M].2版.北京:人民交通出版社,2001.
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