摘要
为研究磷尾矿-EPS复合改性轻质土的强度及膨胀性,试验采用安徽某工程项目区的膨胀土,在保持含水率和干密度不变的情况下,将磷尾矿按不同质量比0%、3%、6%、9%掺入膨胀土中,对改性土进行了无荷膨胀率、无侧限抗压强度试验。结果表明:当磷尾矿掺入量为6%时,抗压强度最大,改性土膨胀率随磷尾矿掺量增加逐渐降低;将EPS按质量比0%、0.25%、0.50%、0.75%、1%掺入6%的磷尾矿改性土中,对复合改性土进行上述试验,得出改性土膨胀率与EPS掺量之间呈线性递减规律,抗压强度随EPS掺量增加呈逐渐降低趋势;对试验结果进一步分析,引入改良效应系数,确定EPS掺量与改良效应系数之间的关系,得到EPS掺量为0.25%时,改良效应系数最大,改良效果最好。
In order to study the effect of strength and swelling of phosphate tailings-EPS composite modified light soil, it used the expansive soil from a project area in Anhui, mixed into expansive soil according to different mass ratios of 0%, 3%, 6% and 9% and carried out the test of no-load expansion rate and unconfined compressive strength of modified soil under the conditions of with constant moisture content and dry density. The results show that when the incorporation of phosphate tailings is 6%, the compressive strength is the maximum and the expansion rate is gradually decreased with the increase of soil phosphorus tailings content change;EPS according to the mass ratio of 0%, 0.25% and 0.5% phosphate tailings, 0.75% and 1% adding 6% modified bentonite, the composite modified soil in the test, obtains between the change soil expansion rate and the content of EPS is decreasing linearly, the compressive strength is decreased gradually with increasing EPS dosage;further analysis of test results, the improved effect coefficient, determine the relationship between EPS content and improved effect coefficient, EPS content is 0.25%, The improved effect coefficient is the biggest and the improvement effect is the best.
作者
庄心善
杨文博
王康
李凯
ZHUANG Xinshan;YANG Wenbo;WANG Kang;LI Kai(School of Civil Architecture and Environment,Hubei University of Technology,Wuhan 430068,China)
出处
《人民黄河》
CAS
北大核心
2020年第6期140-142,147,共4页
Yellow River
基金
国家自然科学基金资助项目(41772332)。
关键词
磷尾矿
EPS
无荷膨胀率
抗压强度
改良效应系数
phosphorus tailings
EPS
no-load expansion rate
compressive strength
modified effect index
