摘要
近年来,水泥土被广泛应用于土体加固工程,其强度与加固效果密切相关。为研究膨润土和粉煤灰掺量对水泥土性能的影响,对25组不同膨润土和粉煤灰掺量的水泥土进行基本力学性能试验。通过抗压强度试验,发现当粉煤灰和膨润土掺量分别为40%和11%时,28 d的水泥土抗压强度最大,为7.30 MPa;当粉煤灰和膨润土掺量分别为20%和7%时,90 d的水泥土抗压强度最大,为7.19 MPa。通过室内直接剪切试验,发现当粉煤灰和膨润土掺量分别为20%和11%时,28 d的水泥土抗剪强度参数粘聚力c最大,为1144.8 kPa;当粉煤灰和膨润土掺量分别为30%和5%时,90 d的水泥土抗剪强度参数粘聚力c最大,为1753.71 kPa。研究成果可以为武汉地区的粉煤灰和膨润土双掺合剂改良水泥土的现场施工提供参考依据。
In recent years,cement-soil has been widely used in soil reinforcement projects,and its strength is closely related to the reinforcement effect.In order to study the effect of the adding amount of bentonite and fly ash on the performance of cement-soil,the basic mechanical properties of 25 groups of cement-soil with different adding amount of bentonite and fly ash were tested.Through the compressive strength test,it was found that when the blending amount of fly ash and bentonite was 40% and 11% respectively,the 28d compressive strength of cement soil was the largest at 7.30MPa;when the blending amount of fly ash and bentonite was 20% and 7%,the 90d compressive strength of cement-soil was the highest at 7.19MPa.Through the indoor direct shear test,it was found that when the fly ash and bentonite content was 20% and 11%respectively,the 28d cement-soil shear strength parameter,e.g.cohesion c,was the largest at 1144.8kPa;when fly ash and bentonite was added with the amount of 30% and 5%respectively,the cohesive force c of the 90d cement soil shear strength parameter was the largest at 1753.71kPa.The research results can provide reference for the on-site preparation of cement-soil with fly ash and bentonite in Wuhan area.
作者
陈律
胡福洪
胡刚
CHEN Lu;HU Fuhong;HU Gang(China Machinery TIDI Geotechnical Engineering Co.,Ltd.,Wuhan Hubei 430000,China;Wuhan Geological Prospecting Foundation Engineering Co.,Ltd.,Wuhan Hubei 430072,China;Enshi Branch of China National Minda International Engineering Design Co.,Ltd.,Enshi Hubei 445000,China)
出处
《探矿工程（岩土钻掘工程）》
2019年第12期62-67,共6页
Exploration Engineering:Rock & Soil Drilling and Tunneling
关键词
水泥土性能
膨润土
粉煤灰
掺量
抗压强度
抗剪强度
土体加固
武汉地区
cement-soil properties
bentonite
fly ash
adding amount
compressive strength
shear strength
soil reinforcement
Wuhan area
