Abstract
As the main part of the anti-seepage system, core wall is a key point in the design of high em-bankment dam. The dam slope stability is a major factor for the type of core wall. But it is still unclear what effects the core wall structure might have on the slope stability. Based on practical projects of high embankment dam in Nuozhadu, Lianghekou and Shuangjiangkou, this paper analyzes safety factors and dangerous slip sur-faces of dam slopes of high embankment dams in both straight and slanting core wall structures and compares the influences of different core wall structures on the slope stability of high embankment dam through numerical calculations. The safety margin of the embankment dam of straight core wall is larger than that of slanting core wall in the operating condition of the reservoir water level’s drawdown. Compared with that of the straight core wall scheme, the position of the dangerous slip surface of the downstream dam slope is closer to the dam crest in the slanting core wall scheme.
Highlights
With the domestic popularization and application of heavy earth-moving machineries and corollary equipment, the construction of embankment dam in China has been rapidly developed
There are problems existing in the construction of concrete embankment dam on thick overburden layer, such as complicated anti-seepage structure, poor anti-seepage reliability, sealing on the joint of the basic anti-seepage wall and the connecting plate as well as that on the joint of the connecting plate and the concrete face might be destroyed due to uneven deformations, and the anti-seepage property of the concrete face might be influenced by tension cracks caused by excessive deformations and so on
Compared with the straight core wall scheme, all positions of dangerous slip-crack surfaces of the downstream dam slope in the slanting core wall scheme are closer to the dam crest
Summary
With the domestic popularization and application of heavy earth-moving machineries and corollary equipment, the construction of embankment dam in China has been rapidly developed. As for the Yele hydropower station project of Nanyahe, the maximum height of the rock-fill dam with asphalt concrete core wall is 125.50m and the thickness of the dam foundation overburden reaches more than 100m. There are 11 embankment dams with a height of more than 230m, including those have been built and those under construction All these dams are anti-seepage type with clay core walls, four of which are constructed with straight core walls and seven are constructed with slanting core walls. As for high clay core wall rock-fill dams on thick overburden layer, anti-seepage wall is generally adopted by the dam foundation overburden. Based on three ultrahigh core wall dam projects in Nuozhadu, Lianghekou and Shuangjiangkou, this paper compares slope stabilities of different core wall structures [9,10,11] and provides a reference for the core wall selection of high embankment dams of this kind
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