深厚覆盖层上高土石坝极限抗震能力分析

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。

Study of maximum aseismic capability of high earth-rock dam on deep riverbed alluviums

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.