不同石灰配合比对昔格达土性能的影响试验研究

Study on the Performance of Xigeda Soil with Different Lime Mixture Ratios

针对攀西地区昔格达土结构颗粒分散、凝聚力小、抗剪强度低、遇水易膨胀软化等不利工程性质,在昔格达土中加入不同配合比的石灰,通过界限含水率试验、击实试验、三轴试验,探究对昔格达土的塑液限、最大干密度、最优含水率、抗剪强度指标的改性效果,并结合工程实际分析了该掺石灰高回填昔格达土边坡多年的使用状况。通过试验发现,随着掺灰量的增加,灰土的塑液限增大,塑限指标减小,最优含水率增大,最大干密度减小,凝聚力和内摩擦角先增加后减小。最后得出结论,石灰土抗剪强度最大值的灰土最佳配合比约为3∶7。

Aiming at Panxi area Xigeda soil with negative engineering properties , such as structure particles dispersed, small cohe- sion, low shear strength and encountering water expansion softening , by adding different contents of lime in Xigeda soil , through boundary moisture test, compaction test and triaxial test, the authors explore the effect of it on plastic liquid limit, maximum dry densi- ty, optimum moisture content and shear strength index modification . Then the practical engineering under the condition of the perennial rainwater role is analyzed. It is found that lime soil plastic liquid limit increases with the increase in the amount of mixing lime, and plastic limit index decreases, the optimum moisture content increases, the maximum dry density decreases, cohesion and internal fric- tion angle first increases and then decreases. Finally, it is concluded that the best ratio of fitting the dust limestone soil with maximum shear strength is about 3： 7.