汶川地震震损水库典型土石坝除险加固分析
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摘要
四川省目前已建成各类水库近7000座。"5.12"汶川大地震对四川的水利工程造成了很大的灾害。根据四川震损水库基本情况,以苍溪县红旗水库的典型震损土石坝为例,对其进行除险加固分析。分析表明,整治前校核、设计、正常水位降至死水位的3种工况坝坡稳定最小安全系数仅为1.098~1.145,小于规范要求值1.15~1.25,经整治后提高到1.262~1.698,满足了要求,最后对整治后的大坝进行地震工况坝坡稳定计算,其抗震稳定安全系数为1.451~1.654,满足规范的要求。研究为震损水库的整治和处理提供了借鉴。
Wenchuan Earthquake caused many reservoirs damaged.According to the basic situation of earthquake-damaged reservoirs in Sichuan province,the Hongqi reservoir in Cangxi county was taken as a typical earth-rockfilled dam example for renovation analysis.Before renovation,the minimum safety factors against sliding of dam slope were only 1.098 ~ 1.145,less than the specification required values(1.15 ~ 1.25),as the water level dropped from exceptional flood level,design flood level and normal water level to dead water level.Through treatment and reinforcement,the values improved to 1.262 ~ 1.698 and met the requirements of specification.Finally,seismic resistance analysis was carried out to study the stability of the dam slope after renovation,and the seismic safety factors were 1.451 ~ 1.654 which met the specification requirements.The results of the statistical data and the renovation of a typical earth-rockfilled dam provided a reference for other similar earthquake-damaged reservoir.
Wenchuan Earthquake caused many reservoirs damaged.According to the basic situation of earthquake-damaged reservoirs in Sichuan province,the Hongqi reservoir in Cangxi county was taken as a typical earth-rockfilled dam example for renovation analysis.Before renovation,the minimum safety factors against sliding of dam slope were only 1.098 ~ 1.145,less than the specification required values(1.15 ~ 1.25),as the water level dropped from exceptional flood level,design flood level and normal water level to dead water level.Through treatment and reinforcement,the values improved to 1.262 ~ 1.698 and met the requirements of specification.Finally,seismic resistance analysis was carried out to study the stability of the dam slope after renovation,and the seismic safety factors were 1.451 ~ 1.654 which met the specification requirements.The results of the statistical data and the renovation of a typical earth-rockfilled dam provided a reference for other similar earthquake-damaged reservoir.
引文
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[12]Seed H B,Idriss I M.Simplified procedure fore valuatingsoil liquefaction potential[J].Journal of Soil Mechanics andFoundation Engineering Division,1971,97(9):1249-1273.
[2]Zhang Guoxin.Wenchuan earthquake seismic analysis ofdam[C]//Technological advances of modern hydraulicstructures.Beijing:China Water Power Press,2008,11:30-40.[张国新.汶川地震大坝震害分析[C]//现代水工结构技术进展.北京:中国水利水电出版社2008,11:30-40.]
[3]Gu Zhi,Zhang Lin,Jiang Qisheng,et al.Analysis of sloperemediation for small earth dam after the Wenchuan earth-quake[C]//Technological advances of modern hydraulicstructures.Beijing:China WaterPower Press,2008.11:47-57.[古志,张林,江启升,等.小型土石坝震后坝坡整治分析[C]//现代水工结构技术进展.北京:中国水利水电出版社,2008.11:305-312.]
[4]Wu Zhaoying,Jing Liping,Bo Jingshan,et al.A review onseismic stability of earth and rockfill dams[J].WorldEarthquake Engineering,2003,19(1):44-50.[吴兆营,景立平,薄景山,等.土石坝地震稳定性分析评述[J].世界地震工程,2003,19(1):44-50.]
[5]Newmark N M.Effects of earthquake on dams and embank-ments[J].Geotechnique,1965,15(2):139-160.
[6]Seed H B.Dynamic analysis of the slide in the Lower SanFernado Damduring the earthquake of February9,1971[J].Journal of Geotechnical Engineering Division,1975,101(9):889-911.
[7]Chen Guoxing,Xie Junfei,Zhang Kexu,et al.Review on theearthquake damage and aseimsic analysis of earth dams[J].World Earthquake Engineering,1991,8(3):24-33.[陈国兴,谢君斐,张克绪,等.土石坝震害与抗震分析评述[J].世界地震工程,1991,8(3):24-33.]
[8]潘家铮,何璟.中国大坝50年[M].北京:中国水利水电出版社,2000:675-725.
[9]Invictajoemon K.Earth-quake question in earth rock dam[J].Express Water Resources and Hydrolower,1999,20(22):4-7.[维克塔乔姆K.与土石坝有关的地震问题[J].水利水电快报,1999,20(22):4-7.]
[10]朱伯芳,杨波.混凝土坝耐强烈地震而不垮的机理[C]//现代水工结构技术进展.北京:中国水利水电出版社2008,11:47-57.
[11]Guo Mingzhu,Ren Fenghua,Teng Haiwen,et al.The char-acteristic analysis of dam strong Earthquake Disaster[J].China Civil Engineering Journal,2003,36(11):106-109.[郭明珠,任凤华,腾海文.大坝强震震害特征分析[J].土木工程学报,2003,36(11):106-109.]
[12]Seed H B,Idriss I M.Simplified procedure fore valuatingsoil liquefaction potential[J].Journal of Soil Mechanics andFoundation Engineering Division,1971,97(9):1249-1273.
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