论文部分内容阅读
针对皖西典型中膨胀土及其石灰改性土,进行了系统的物理特性、胀缩特性、强度特性试验。试验结果表明:中膨胀土具有较强的吸水膨胀软化特性,其CBR值低于3%,不能满足路基对填料的强度要求,用作路基填料必须改性;经石灰改性后,其自由膨胀率、塑性指数显著降低,亲水能力大幅度下降,水稳定性较好,能有效抑制其胀缩潜势和提高土体强度,能满足路堤填筑的要求。中膨胀土石灰改性的质量掺入比按6.0%控制,压实含水量以控制在最优含水量±3%范围内为宜。
Aiming at the expansive soil and lime-modified soil in typical West Anhui Province, the system physical characteristics, swelling and shrinking characteristics and strength characteristics were tested. The test results show that the medium expansive soil has strong water softening and softening properties, its CBR value is less than 3%, which can not meet the requirements of the subgrade for the strength of the filler. As the subgrade filler, it must be modified; after being modified by lime, its free expansion The rate and plasticity index decreased significantly, the hydrophilic capacity decreased greatly, the water stability was better, which could effectively restrain the expansion and contraction potential and increase the soil strength, which could meet the requirements of embankment filling. In the expansive soil lime modified mass blending ratio of 6.0% control, compaction of water content to control the optimal moisture content within ± 3% is appropriate.