论文部分内容阅读
巴东组紫红色泥岩风化物具有膨胀性,不能满足路基的要求,利用水泥对路基填料进行改良,并通过对击实试验、无侧限抗压强度试验、CBR试验和电子显微镜扫描试验的分析,研究水泥改良土在不同水泥配比下的物理力学指标。结果表明:随着水泥配比的增加,改良土的CBR2.5和CBR5.0呈线性增加趋势,改良土的膨胀性得到显著改善。同时试验表明,水泥改良土具有良好的水稳定性。此外,改良土的无侧限抗压强度亦随水泥配比的增加而线性增加。改良土微观结构表明,改良土宏观性质的大幅度提升是由于改良土孔隙中生成了大量纤维状钙矾石,提高了土颗粒黏聚力,从而改善土体性质。
Badong group of magenta mudstone weathering material with expansibility, can not meet the requirements of subgrade, the use of cement to improve subgrade filler, and through the compaction test, unconfined compressive strength test, CBR test and electron microscopy analysis of the test , To study the physical and mechanical indexes of cement-modified soil under different cement proportions. The results show that CBR2.5 and CBR5.0 show a linear increase trend with the increase of cement proportion, and the expansibility of modified soil is significantly improved. At the same time, experiments show that cement modified soil has good water stability. In addition, the unconfined compressive strength of modified soil increases linearly with the increase of cement proportion. The improvement of soil microstructure shows that the macroscopic improvement of macroscopic properties of the improved soil is due to the formation of a large amount of fibrous ettringite in the pores of modified soil, which improves the cohesion of soil particles and improves the soil properties.