摘要
在保持含水率和干密度不变的条件下,将风化砂以不同比例掺入膨胀土中,通过击实试验、无荷膨胀试验和三轴试验,研究风化砂改良膨胀土的效果。研究结果表明：最优含水率随掺砂量增加而减小,但最大干密度先增大后减小;随着风化砂掺量增多,膨胀率相应降低;当掺砂量达到40%时,膨胀率降低了6.64%,风化砂能明显抑制膨胀土的膨胀性;膨胀土的主应力峰值随掺砂量的增加先增大后减小,当掺砂量为16%时抗剪强度最大,而黏聚力随掺砂量的增加逐渐减小,内摩擦角先增大后减小,因此确定最佳掺砂量为16%。
When maintain the moisture content and dry density under the same conditions,the weathered sand is added to expansive soil by different proportion.Through compaction test,free swelling test and triaxial test,the effect of improved expansive soil by weathered sand is studied.The results show that：the optimum moisture content decreases with the increase of sand content,but the maximum dry density increases first and then decreases;with weathered sand content increased,the expansion rate decreased,when the sand content reaches 40%,the expansion rate is reduced by 6.64%,weathered sand can significantly inhibit the swelling of expansive soil;the main stress peak value of expansive soil increases first and then decreases with the increase of sand content,when the sand proportion is 16%,the shear strength is the largest,but the cohesive force decreases with the increase of sand ratio,and the internal friction angle increases first and then decreases.Therefore,the optimal sand mixing ratio is 16%.
作者
庄心善
王子翔
ZHUANG Xin-shan;WANG Zi-xiang(School of Civil Engineering and Environment,Hubei University of Technology,Wuhan 430068,China)
出处
《公路》
北大核心
2018年第9期248-252,共5页
Highway
基金
国家自然科学基金,项目编号51408201
关键词
膨胀土
风化砂
掺砂比
三轴试验
expansive soil
weathered sand
sand content
triaxial test
