摘要
为评价分析粉煤灰用作路堤填料的可行性与合理性,本文通过室内试验方法研究了不同电厂粉煤灰的最大干密度、渗透系数、静力强度以及动力强度等参数,成果如下:(1)随着含水率的增大,粉煤灰干密度呈先增大后减小的变化趋势,当含水率为19 %左右时,粉煤灰的干密度最大;而随着干密度的增大,粉煤灰渗透系数呈指数递减式减小,当干密度在1.35 g/cm^3以下时,粉煤灰干密度对其渗透系数的影响可以忽略不计。(2)随着含水率的增大,粉煤灰内聚力在含水率为26%以下时减小得较慢,在含水率大于26 %时减小得较快;而粉煤灰内摩擦角则随含水率每增大1 %,减小约0.25°。(3)粉煤灰的含水率越接近最佳含水率或压实度越接近100 %,其内聚力和内摩擦角随振动次数的减小幅度就越小,且越容易在振动前期达到稳定状态。
In order to evaluate the feasibility and rationality of using fly ash as embankment filler,it studied the parameters of maximum drydensity,permeability coefficient,static strength and dynamic strength of fly ash from different power plants through laboratory test methods. The results are as follows:(1)With the increase of water content,the dry density of fly ash increases first and then decreases,and when the water content is about 19%,the dry density of fly ash is the largest.The dry density increases,the permeability coefficient of fly ash decreases exponentially.When the dry density is below 1.35g/cm^3,the effect of dry density of fly ash on its permeability coefficient is negligible.(2)With the increase of water content,the cohesion of fly ash decreases slowly when the water content is below 26%,and decreases faster when the water content exceeds 26%.While the internal friction angle of fly ash is each time the moisture content increases by 1%,it is reduced by about 0.25~. (3)The closer the moisture content of fly ash to the optimum water content or the closer the compaction degree to 100%,the smaller the decrease of cohesion and internal friction angle with the number of vibrations is,and the easier it is to reach a stable state in the early stage of vibration.
作者
刘铁军
Liu Tiejun(Zhengzhou Second Municipal Construction Group Co.,Ltd.,Zhengzhou,Henan 450000,China)
出处
《粉煤灰综合利用》
CAS
2018年第6期62-65,共4页
Fly Ash Comprehensive Utilization
关键词
粉煤灰
路堤填料
力学特性
试验研究
fly ash
embankment filling
mechanical property
experimental researches
