In this paper, widely distributed weathered sand in the three gorges reservoir area is used to im-proved expansive soil,through mixed with 10%,20%,30%,40%and 50%weathered sand,respectively,so their dry density varied, then samples were prepared by static pressing, unconfined compressive strength test was carried out.Research has shown that weathered sand can significantly improve the unconfined compressive strength of expansive soil;when initial dry density is fixed,unconfined compressive strength first increases then decreases with the increase of sand proportion,reachs the maximum when the sand proportion was 10%;uncon-fined compressive strength of weathered sand improved expansive soil and the sanding scale are in good correla-tion with polynomial; unconfined compressive strength of weathered sand improved expansive soil increases gradually with the increase of initial dry density, unconfined compressive strength and the initial dry density have good correlation with quadratic polynomial.%以三峡库区广泛分布的风化砂来改良膨胀土,通过在膨胀土中掺入10%、20%、30%、40%、50%的风化砂,变换各自的干密度,然后静压制样,进行无侧限抗压强度试验.研究表明:风化砂可以显著提高膨胀土的无侧限抗压强度;在初始干密度一定时,无侧限抗压强度随着掺砂比例的增加先增大后减小,在掺砂比例为10%时达到最大;风化砂改良膨胀土的无侧限抗压强度与掺砂比例呈良好的多项式关系;风化砂改良膨胀土的无侧限抗压强度随着初始干密度的增加逐渐增大,无侧限抗压强度与初始干密度有很好的二次多项式关系.
展开▼
