关键词: 蓄水速率, 蓄水水头, 沉降增量, 沉降率, 应变率

Abstract: Pitch concrete is often used as seepage prevention of the bottom of pumped storage reservoir. Crack may be found in it if the filling rate is too larger or the filling water head is too high. In this study, based on an example of the upper reservoir of a pumped storage power station, the influences of the filling rate and filling water head on the settlement, settlement rate of the reservoir foundation, and the strain rate of the pitch concrete are analyzed. Before analyzing, the model parameters of some materials are obtained based on observed settlement data and initial model parameters using an optimum method. The 2D FEM and Biot consolidation theory are used in this study. The results of analysis indicated that the filling rate has little effect on the ultimate settlement of the foundation, but has larger influence on the settlement increment during filling, the maximum settlement rate of the foundation and the maximum strain rate of the pitch concrete; and the filing water head has little effect on the maximum strain rate of the pitch concrete, but has larger influence on the settlement increment during filling, the maximum settlement rate of foundation. The relationships between the settlement increment during filling and the filling rate and filling water head, between the maximum settlement rate and the filling rate and filling water head, and between the strain rate of pitch concrete and the filling rate are also given.

Key words: filling rate, filling water head, settlement increment, settlement rate, strain rate