塔克拉玛干沙漠砂工程性质试验研究

Research on Engineering Properties of Desert Sands in Taklimakan Desert

塔克拉玛干腹地沙漠砂具有特殊的岩土工程性质。在对沙漠砂室内大中型槽原位模拟试验和现场原位试验的基础上,建立了静力触探、标准贯入指标和沙漠砂密实度、抗剪强度间的经验关系,并且将部分经验公式表格化。研究结果表明:已有用标准贯入指标N值估计砂土密实度的标准用于评价沙漠砂时会得出较保守的估计;另外沙漠砂内摩擦角与相对密实度和含水量的关系密切,内摩擦角随相对密实度的增加而增大,非饱和砂内摩擦角随相对含水量的增加而增大。

The desert sands in central Taklimakan Desert have peculiar engineering properties. On the basis of a large amount of laboratory simulation test in large medium tank and field in-situ tests, we set up relationship between the indexes of cone penetration test and standard penetration test and engineering properties. Moreover the paper tabulated some experiential formula. And based on the test of desert sand, we can get useful research results. It will get conservative estimate when we evaluate desert sand compactness by the present criterion of standard penetration N. The internal friction angle of desert sand is affected by compactness and moisture. It will increase by the accretion of compactness and moisture of unsaturated sand.