中文摘要：

汤浦水库东、西主坝为建于软基上的混凝土面板堆石坝,拟采用空心箱体和堆石体方案进行大坝加高,坝高、水位的增加会改变坝体、坝基、面板的应力和变形。采用土工离心模型试验技术研究不同方案下坝体、坝基、面板的应力和变形特性,探讨加高方案的可行性。东、西主坝现状坝体经15 a的运行,大坝工作性态良好,整体稳定安全。东、西主坝空心箱体加高和东主坝堆石体加高后,坝体及坝基沉降、面板应力增量不大,且很快稳定,面板顺坡向应力大部分为压应力,坝顶附近可能出现很小的拉应力,均小于混凝土强度,上、下游坝坡稳定。西主坝堆石体加高后,坝体及坝基沉降、面板应力有一定的增大,面板顺坡向应力大部分为压应力,小于混凝土抗压强度,坝顶附近可能出现一定的拉应力,上、下游坝坡稳定。试验结果表明,2种加高方案均可行,但空心箱体加高方案优于堆石体加高方案。

英文摘要：

The east and west dams of Tangpu reservoir are concrete face rockfill dams built on soft soil foundation.The schemes of hollow box and rockfill were proposed for the dams heightening. The stress and deformation of dam,foundation and face would change with the increase of dam height and water level. Centrifuge modeling tests were carried out to study the behavior of stress and deformation of the current and heightened dams and the feasibility of heightening scheme. The current west and east dams are stable and at good condition after 15 years operation. When east and west dam heighten with hollow box,and east dam heighten with rockfill,the settlement of dam and stress of face would increase slightly and soon become stable. The stress of most face is compressive stress,and the stress of face near the crest may be small tensile stress. The stress of face is less than the strength of concrete. The dam slopes are stable. When west dam heighten with rockfill,the settlement of dam and stress of face would increase for a certain extant. The stress of most face is compressive stress,and is less than the compressive strength of concrete. The stress of face near the crest may be tensile stress. The dam slopes are stable. It indicat that the two heightening schemes are acceptable,but hollow box heightening scheme is better than rockfill heightening scheme.