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石灰土在公路等工程中应用很广泛,随着公路改扩建等工程的迅速增多,面临如何处理与利用废弃石灰土的难题。通过对比分析素土、石灰土、重塑石灰土的压缩、强度等力学指标,探讨重塑石灰土的力学特征。结果表明,重塑石灰土压缩系数与石灰土相比提高了2～3倍,无侧限抗压强度损失了30%～40%,内摩擦角增大了1.2倍,黏聚力降低了40%。提出用劣化系数评价重塑石灰土的力学特性劣化程度,并从石灰处治红黏土的团粒化、碳化、灰结机制等角度分析了重塑石灰土性能劣化的本质原因。与素土相比,石灰土的黏粒(d<0.002 mm)含量减少而粗粒(d>0.074 mm)含量增加,从而提高了石灰土的内摩擦角。但重塑过程则破化了石灰土中的胶结结构致使重塑石灰土的黏聚力降低,从而影响重塑石灰土的其他力学性能指标。
Lime soil is widely used in highways and other projects. With the rapid expansion of roads and other projects, it is facing the problem of how to deal with and utilize abandoned lime soil. The mechanical characteristics of remolded lime soil are discussed through comparison and analysis of the mechanical indexes such as compression and strength of plain soil, lime soil and remolded lime soil. The results show that the compressive coefficient of remolded lime soil is 2 ~ 3 times higher than that of lime soil, the unconfined compressive strength is reduced by 30% ~ 40%, the internal friction angle is increased by 1.2 times and the cohesion is reduced by 40% %. The degradation coefficient of the remolded lime soil was evaluated by the degradation coefficient. The nature of the degraded lime soil was analyzed from the perspective of the granulation, carbonization and ash mechanism of lime-treated red clay. Compared with plain soil, the content of clay (d <0.002 mm) decreased and the content of coarse particles (d> 0.074 mm) increased in limestone, which increased the internal friction angle of lime soil. However, the remodeling process breaks down the cemented structure in the limestone so as to reduce the cohesion of the remineralized limestone so as to affect other mechanical properties of the remineralized limestone.