改良膨胀土干缩裂隙发育规律的研究

Research on the crack development of the improved expansive soil

运用Matlab软件图像处理功能,对干湿循环作用后不同改良方法的膨胀土表面裂隙参数进行了定量分析,探讨了改良膨胀土表面的裂隙发育规律。研究结果表明;改良膨胀土表面的裂隙率随干湿循环次数的增加而增加,最终趋于一种稳定状态。提高压实度、加入筋体材料、掺风化砂及掺石灰均能很好抑制膨胀土土样中裂隙发育的程度,作用效果不尽相同。但在实际工程应用中,需要对压实后的土体采取包盖隔水措施,确定最佳加筋位置,以及采用合理的掺砂量和掺灰量。

The image processing function of MATLAB software is used to make a quantitative analysis on the surface of the expansive soil crack parameters after the dry-wet circulation with different modified methods. The rules of the development of the improved expansive soil surface crack are studied.The results show that improved expansive soil surface crack rate increases with the increase the number of dry-wet circulation, and tends to a stable state finally.The development degrees of the expansive soil sample cracks are suppressed through improving the degree of compaction when geotextile material is added and mixed with sand or lime, and the effect is not the same. But in the practical engineering, waterproof measures is taken to the soil after compacted, the best reinforced location is determined and with a certain content of mixed sand and lime.