水土保持研究2013，Vol.20Issue(2)：276-281,6.
风化砂改良膨胀土对抗剪强度指标的影响研究
Research on Shear Strength Index of Expansive Soil Modified by Weathered Sand
杨俊 1童磊 1张国栋 1熊君来 1唐云伟 1梁勇1
作者信息
摘要
Abstract
Through the comparative analysis of the influences of expansive soils improved by lime, cement, coal ash on the shear strength index, impact of the weathered sand improved expansive soil on shear strength index was studied. The shear of the expansive soil mixing with different proportion of weathered sand was tested. The results showed that the expansive soil shear strength could be effectively improved after weathered sand was incorporated into expansive soil; its cohesive force will decrease gradually with the increase of sand addition proportion; and the angle of internal friction would firstly increased and then decreased along with the increase of sand addition proportion. The expansion characteristic was tested after adding different proportion of weathered sand, and the conclusion could be drawn as followings: blending weathered sand could effectively inhibit the expansion and contraction of expansive soil, the swell-shrink rate of the improved expansion soil was lower than 0. 7% , therefore, it could reach the standard of packing filling. With respect to comprehensive consideration of the influence of the sand addition ratio and moisture content on expansive soil shear strength parameters, it could be concluded that when sand addition proportion was up to 30% and the moisture content was 10% , the shear strength of the expansive soil that added with weathered sand would achieve the best parameter.关键词
膨胀土/风化砂/掺砂比例/含水率/抗剪强度/胀缩特性Key words
expansive soil/ weathered sand/ proportion of sand/ moisture content/ shear strength/ expansion and shrinkage characteristics分类
建筑与水利引用本文复制引用
杨俊,童磊,张国栋,熊君来,唐云伟,梁勇..风化砂改良膨胀土对抗剪强度指标的影响研究[J].水土保持研究,2013,20(2):276-281,6.
