论文部分内容阅读
为了研究水泥粉煤灰搅拌桩处治湿软黄土地基的适用性,以某高速公路湿软黄土段为工程依托,以水泥与粉煤灰不同重量比组成的固化剂及其不同掺入比配制的试件进行的无侧限抗压强度试验、直剪试验和固结压缩试验为基础,选择最佳配比后进行水泥粉煤灰搅拌桩的现场实测结果对比。结果表明,当水泥与粉煤灰的重量比不小于2:1时,粉煤灰的添加对试件的抗剪强度影响不大;固化剂掺入比达到15%以后,水泥粉煤灰土与水泥土试件的强度相差值减小;现场实测工后沉降量和桩体强度均符合设计要求。水泥粉煤灰搅拌桩处理湿软黄土地基是经济可靠的。
In order to study the applicability of cement fly ash mixing piles in treating wet and soft loess foundation, based on the wet and soft loess section of an expressway, the curing agent with different weight ratios of cement and fly ash and their different blending ratios Based on the unconfined compressive strength test, direct shear test and consolidation compression test of the test pieces, the field test results of cement fly ash mixing piles were compared after choosing the best proportion. The results show that when the weight ratio of cement to fly ash is not less than 2: 1, the addition of fly ash has little effect on the shear strength of the specimen. After the ratio of curing agent to 15% The difference between the strength of cement soil specimens decreases; the measured settlement after the site and pile strength are in line with the design requirements. Cement fly ash mixing pile processing wet and soft loess foundation is economical and reliable.