CAJ | 학술논문

为了研究水泥粉煤灰不同掺量对超盐渍土的力学性能影响规律,分别以1%,3%,5%水泥和20%、25%、30%粉煤灰掺入宁夏平罗县姚伏镇的超盐渍土中对其进行固化,并进行7 d 和28 d 龄期的三轴 UU 试验。结果表明：7 d 龄期,相同掺量粉煤灰固化超盐渍土的摩擦角和粘聚力随水泥掺量的增加呈近似线性增加；28 d 龄期,相同掺量粉煤灰固化超盐渍土的摩擦角随水泥掺量的增加趋势呈先慢后快；粉煤灰掺量为20%时,摩擦角随龄期的增加而增加,粉煤灰掺量为25%和30%时,摩擦角随龄期的增加而减小；固化超盐渍土轴向应变较小时,水泥和粉煤灰对主应力差的影响较小,随着轴向应变的增大,水泥粉煤灰固化超盐渍土的作用逐渐增强。建议利用水泥粉煤灰固化超盐渍土时,当固化盐渍土地基三向约束较强时,可以采用1%~3%水泥和20%~25%粉煤灰固化超盐渍土,反之,采用5%水泥和30%粉煤灰或更高掺量的水泥粉煤灰固化超盐渍土。
위료연구수니분매회불동참량대초염지토적역학성능영향규률,분별이1%,3%,5%수니화20%、25%、30%분매회참입저하평라현요복진적초염지토중대기진행고화,병진행7 d 화28 d 령기적삼축 UU 시험。결과표명：7 d 령기,상동참량분매회고화초염지토적마찰각화점취력수수니참량적증가정근사선성증가；28 d 령기,상동참량분매회고화초염지토적마찰각수수니참량적증가추세정선만후쾌；분매회참량위20%시,마찰각수령기적증가이증가,분매회참량위25%화30%시,마찰각수령기적증가이감소；고화초염지토축향응변교소시,수니화분매회대주응력차적영향교소,수착축향응변적증대,수니분매회고화초염지토적작용축점증강。건의이용수니분매회고화초염지토시,당고화염지토지기삼향약속교강시,가이채용1%~3%수니화20%~25%분매회고화초염지토,반지,채용5%수니화30%분매회혹경고참량적수니분매회고화초염지토。
In order to study the influence of different content of cement and fly ash on mechanical properties of hypersaline soil, the hypersaline soil from Yaofu, Pingluo county of Ningxia, was mixed with 1% , 3% and 5% cement and 20% , 25% and 30% fly ash for solidification, respec-tively, and the soil of 7-day and 28-day age were investigated by triaxial UU test. The results show that for the soil of 7-day age, when the dosage of fly ash is the same, the friction angle and the co-hesion linearly increases with the content of cement; that for the soil of 28-day age, the friction an-gel increases slowly first, and later it increases fast with the cement. Comparing the overweight sa-line soil of 28-day age and 7-day age, several interesting conclusions are obtained. When the dosage of fly ash is 20% , the friction angle increases with the age; when the dosage of fly ash is 25% or 30% , the friction angle decreases with the age. When the axial strain is small, the dosage of cement and fly ash has little effect on the main strain. With the increase of axial strain, the solidification of cement and fly ash of hypersaline soil is obvious. Some advices are also proposed for the design and construction of solidification of hypersaline soil with cement and fly ash. When solidified saline soil suffers from strong constraints, 1% ~ 3% cement and 20% ~ 25% of fly ash stabilized saline soil can be used, otherwise 5% cement and 30% fly ash or higher dosage of cement fly ash solidified saline soil must be used.