论文部分内容阅读
硅化法是湿陷性黄土地基处理的主要化学方法之一,为了提高固化效果需要对水玻璃溶液进行改性。对温度改性水玻璃溶液固化黄土进行了试验研究,并通过化学组成和矿物成分分析、微观结构分析探讨了温度改性水玻璃固化黄土的机制。试验结果表明:在20～80℃范围内,随着温度的升高,水玻璃固化黄土的强度有明显提高;X射线衍射图谱中部分矿物衍射强度降低并出现密集低矮的非晶质物相峰群;SEM图像显示随着温度的升高凝胶薄膜增多;MIP(压汞试验)数据显示,随着温度的升高,孔隙表面积增大。水玻璃溶液固化黄土的强度随温度增加的机制在于:生成的非晶质物相和凝胶薄膜随着温度的升高而增加,促使最可几孔径的减小和小孔隙的增多,强化了骨架颗粒的连接强度,并将骨架颗粒黏结成为一个空间网状整体,从而改善了土体的强度。
Silicification method is one of the main chemical methods for the treatment of collapsible loess foundation. In order to improve the curing effect, the water glass solution needs to be modified. The temperature-modified water glass solution solidified loess was studied, and the mechanism of temperature-modified water glass solidified loess was discussed through chemical composition, mineral composition analysis and microstructure analysis. The experimental results show that the strength of water glass cured loess increases obviously with the increase of temperature in the range of 20 ~ 80 ℃. The diffraction intensity of some minerals in X-ray diffraction pattern decreases and dense, low-density amorphous phase appears The results of MIP (mercury intrusion porosimetry) show that the pore surface area increases with the increase of temperature. Water glass solution solidified loess strength increases with temperature mechanism is: the formation of amorphous phase and the gel film increases with increasing temperature, prompting the most can be a small hole diameter and small pores increased, strengthened The connection strength of the skeleton particles, and the skeleton particles bonded into a spatial network of the whole body, thereby improving the soil strength.