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Abstract The growth and dissipation process of pore water pressure in rockfill dams during construction period is very complex. Based on the monitoring data of Pubugou corewall，the characteristics and forming mechanism of pore water pressure during the construction period are analyzed. In addition，the comparative analyses between Pubugou dam，Xiaolangdi dam and Lubuge dam are made. The results show that：(1) The growth and dissipation modes of pore water pressure in Pubugou corewall during the construction period contain four modes which are delay-response mode，immediate-response mode I，immediate-response mode II and no-response mode. (2) The immediate-response mode II is the main growth and dissipation mode. (3) The essence of delayed response of piezometers is the process that the soil around the piezometers changes from nonsaturated state to saturated state. (4) The permeability coefficient of soil is the determinant factor of the delay response of piezometers. (5) The immediate-response mode I is the result of the more high water content in local corewall；so，in order to avoid the immediate-response mode I，the water content of corewall should keep uniformity during the construction period. (6) Filling rate has significant effects on pore water pressure of the delay-response mode and immediate-response mode II；and the effect on the immediate-response mode I is not obvious. The heterogeneity of gravelly soil should be paid high attention during the design and research stages of rockfill dams of gravelly soil corewall.
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Received: 24 August 2010
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2011, Vol. 30 
