新疆某水利枢纽工程砂卵砾石坝基勘察分析

Survey and analysis on sand and gravel dam foundation of a hydropower project in Xinjiang

在覆盖层上直接建坝,具有经济、工期和环保方面的优势,但因其适应性论证困难,也使覆盖层上建坝存在着不同程度的技术难题。在新疆某水利枢纽工程勘察过程中,利用钻探、坑探、物探、原位试验、室内试验等勘探手段,对深厚覆盖层的成因、物质组成、空间分布、结构特征及其物理力学性质进行了分析。提出了覆盖层的承载力、变形模量、渗透系数和允许渗透比降等力学参数的建议值,为覆盖层上建坝提供了必要的设计依据。

The dams directly constructed on the overburden layer have the advantages in economy, construction period and en-vironment, however, the difficulties in feasibility demonstration will result in some technical challenges. This paper gives a detail introduction to the survey and analysis of the genesis, material composition, spatial distribution, structural characteristics and physical and mechanical properties of a hydropower project dam foundation in Xinjiang by conventional means, such as drilling, pitting, geophysical prospecting, in-situ tests, laboratory test, etc. and proposes the mechanical suggestion values of load bear-ing capacity, deformation module, seepage coefficients and permitted seepage gradient.