新疆下坂地水库上游围堰设计及软基处理

Upstream Cofferdam Design and Soft-ground Treatment of Xiabandi Reservoir Project in Xinjiang

新疆下坂地水库大坝上游围堰基础下伏地层中存在饱和软土层,孔隙比高,含水量大,强度低,压缩性高,灵敏度高。在围堰的设计过程中对于软基的处理存在一定的难度。本文通过对下坂地水利枢纽工程上游围堰基础淤泥质粘土层加固处理、软粘土层处理、土工织物及土工格栅的应用设计等方面阐述了围堰的设计特点,并通过渗流计算、稳定计算进行了验证。理论计算和工程实践表明效果良好。

In the underlying strata of upstream cofferdam basis of Xiabandi Reservoir Dam located in Xinjiang, there exists the saturated soft soil which is characterized of high porosity ratio, high water content, low-intensity, highcompression, high sensitivity. The treatment of soft-basis is certain difficult in the process of the cofferdam design. The paper is aimed to show features of the cofferdam design by the reinforcement to the muddy clay and soft clay layer, the application of geotextile and geogrid in the upstream cofferdam of Xiabandi water project. These measures are effectively verified by theoretical calculation of the seepage and stability, and project practice.