基于黄土物理化学性质变化的固化土强度影响因素分析

Analysis of influence factors for solidified soil strength based on change of physicochemical properties of loess

基于黄河中游地区黄土自西北向东南分布变化的规律,研究黄土的物理化学性质和矿物成分对水泥基土壤固化剂固化土无侧限抗压强度的影响。试验结果表明:随着黏粒含量的增加,固化土的强度先降低后增加,其中黏粒含量17.0%是分界点;随着碱度的增加,固化土的强度增加;蒙脱石的加固效果好于伊利石,在以伊利石为主的土中,随着伊利石含量的增加,固化土的强度升高;随着阳离子交换总量的增加和交换性钠离子百分比的降低,固化土的强度增加。研究表明,黄土的物理化学性质不同是水泥基土壤固化剂土质适宜性产生的主要原因;黄河中游地区自西北向东南加固土的强度具有增大的规律性。

Based on the rules of the loess distribution from northwest to southeast in the middle reaches of the Yellow River, the influence factors of solidified soil with the cement-based soil stabilizer were studied including physicochemical properties and minerals. The results show that with the clay content increase, the strength of solidified soil reduced and then increased of which the clay content of 17.0% is the cut-off points. The strength increased with the more alkalinity in soil. The impact of the montmorillonite is better than the illite. The strength increased as the content of the illite added in the illite soil. The strength increased as the cation exchangeable capacity added and the exchangeable sodium percent reduced. The study indicates that the main reason of soil suitability of based-cement soil stabilizer is .the different physicochemical properties of soil; and the strength regularity of the solidified soil is that strength increased from northwest to southeast in the middle reaches of the Yellow River.