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估算土石坝地震后的永久变形,有利于评价土石坝的抗震性能。过去,开展这项工作采用的方法有1976年 Serff 等人发表的等效节点力法及1983。1987年 Tanjguchi 等人所创的等效惯性力法。前者应用了 Seed 的应变势概念,但应力-应变曲线取自静力试验;后者采用动力试验,但惯性力方法难于决定。作者采用两者的优点,即等效节点力及动力的应力-应变曲线,同时假定永久变形的方向与静剪应力方向一致。以小浪底土坝为例。对该坝进行了二维与三维的震后永久变形计算,包括灌浆帷幕的永久变形。
Estimating the permanent deformation of the earth-rock dam after an earthquake is helpful to evaluate the seismic performance of the earth-rock dam. In the past, the methods used to carry out this work include the equivalent nodal force method published by Serff et al. In 1976 and the equivalent inertial force method developed by Tanjguchi et al. 1983-1987. The former applies the concept of seed strain, but the stress-strain curve is taken from the static test; the latter uses the dynamic test, but the inertial force method is difficult to determine. The author adopts the advantages of both, ie, the stress-strain curves of equivalent nodal forces and motions, and assumes that the direction of permanent deformation is consistent with the direction of static shear stress. Take Xiaolangdi earth dam as an example. The dam was subjected to two-dimensional and three-dimensional post-earthquake permanent deformation calculations, including the permanent deformation of grouting curtain.