深厚覆盖层上高土石坝极限抗震能力分析
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摘要
针对强震区深厚覆盖层上高土石坝的特点,在三维真非线性有效应力地震反应分析基础上,提出了一套深厚覆盖层上高土石坝极限抗震能力的研究方法。从稳定、变形、防渗体安全等方面,对建在深厚覆盖层上的长河坝高心墙堆石坝的极限抗震能力进行了研究和分析。根据坝坡稳定性、地震残余变形、液化可能性、单元抗震安全性、防渗心墙及坝基防渗墙安全等多角度的评价结果,初步认为,长河坝的极限抗震能力为0.50～0.55g。
Based on the developed 3D authentic nonlinear effective stress dynamic analysis method of high earth-rock dam, the analysis method to evaluate the maximum aseismic capability of high earth core rockfill dam is proposed considering the characteristics of high earth–rock dam on deep riverbed alluviums located in the strong earthquake area. The maximum aseismic capability is studied and evaluated by focusing the emphasis on the stability, deformation and safety of the impervious core and impervious wall in riverbed alluviums which should be the decisive factors on the aseismic safety of high earth–rock dam on deep riverbed alluviums. The proposed method has been successfully applied to the maximum aseismic capability evaluation of Changheba high earth core rock-fill dam with several evaluation standards discussed. Based on the comprehensive study results including dam slope dynamic stability, earthquake-induced permanent deformation, liquefaction potential, element aseismic safety and aseismic safety of the impervious core and impervious wall, the maximum aseismic capability of Changheba high earth core rockfill dam is evaluated as about 0.50-0.55 g.
Based on the developed 3D authentic nonlinear effective stress dynamic analysis method of high earth-rock dam, the analysis method to evaluate the maximum aseismic capability of high earth core rockfill dam is proposed considering the characteristics of high earth–rock dam on deep riverbed alluviums located in the strong earthquake area. The maximum aseismic capability is studied and evaluated by focusing the emphasis on the stability, deformation and safety of the impervious core and impervious wall in riverbed alluviums which should be the decisive factors on the aseismic safety of high earth–rock dam on deep riverbed alluviums. The proposed method has been successfully applied to the maximum aseismic capability evaluation of Changheba high earth core rock-fill dam with several evaluation standards discussed. Based on the comprehensive study results including dam slope dynamic stability, earthquake-induced permanent deformation, liquefaction potential, element aseismic safety and aseismic safety of the impervious core and impervious wall, the maximum aseismic capability of Changheba high earth core rockfill dam is evaluated as about 0.50-0.55 g.
引文
[1]赵剑明,汪闻韶,常亚屏,等.高面板坝三维真非线性地震反应分析方法及模型试验验证[J].水利学报,2003,(9):12-18.ZHAO Jian-ming,WANG Wen-shao,CHANG Ya-ping,et al.3D authentic nonlinear dynamic analysis method of high CFRD and verification by model test data[J].Journal of Hydraulic Engineering,2003,(9):12-18.
[2]赵剑明,汪闻韶,张崇文.土石坝振动孔压影响因素的研究[J].水利学报,2000,(5):54-59.ZHAO Jian-ming,WANG Wen-shao,ZHANG Chong-wen.Study on influence factors of seismic pore water pressure in earth-rock dams[J].Journal of Hydraulic Engineering,2000,(5):54-59.
[3]汪闻韶,金崇磐,王克成.土石坝的抗震计算和模型试验及原型观测[J].水利学报,1987,(12):1-16.WANG Wen-shao,JIN Chong-pan,WANG Ke-cheng.Aseismatic calculation,model test and prototype experiments and field monitoring of earth-rock dam[J].Journal of Hydraulic Engineering,1987,(12):1-16.
[4]赵剑明,常亚屏,陈宁.高心墙堆石坝地震变形与稳定分析[J].岩土力学,2004,25(增刊2):423-428.ZHAO Jian-ming,CHANG Ya-ping,CHEN Ning.Study on earthquake-induced permanent deformation and dynamic stability of high core rock-fill dam[J].Rock and Soil Mechanics,2004,25(Supp.2):423-428.
[5]中国水利水电科学研究院.长河坝心墙堆石坝坝基及坝体材料动力特性试验研究报告[R].[S.l.]:[s.n.],2006.
[2]赵剑明,汪闻韶,张崇文.土石坝振动孔压影响因素的研究[J].水利学报,2000,(5):54-59.ZHAO Jian-ming,WANG Wen-shao,ZHANG Chong-wen.Study on influence factors of seismic pore water pressure in earth-rock dams[J].Journal of Hydraulic Engineering,2000,(5):54-59.
[3]汪闻韶,金崇磐,王克成.土石坝的抗震计算和模型试验及原型观测[J].水利学报,1987,(12):1-16.WANG Wen-shao,JIN Chong-pan,WANG Ke-cheng.Aseismatic calculation,model test and prototype experiments and field monitoring of earth-rock dam[J].Journal of Hydraulic Engineering,1987,(12):1-16.
[4]赵剑明,常亚屏,陈宁.高心墙堆石坝地震变形与稳定分析[J].岩土力学,2004,25(增刊2):423-428.ZHAO Jian-ming,CHANG Ya-ping,CHEN Ning.Study on earthquake-induced permanent deformation and dynamic stability of high core rock-fill dam[J].Rock and Soil Mechanics,2004,25(Supp.2):423-428.
[5]中国水利水电科学研究院.长河坝心墙堆石坝坝基及坝体材料动力特性试验研究报告[R].[S.l.]:[s.n.],2006.
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