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为了扩大黄土地区地基填料的使用范围,以某地区黄土为例,对其进行水泥改良土试验。试验结果表明:水泥掺量对改良土的最大干密度、最优含水率、压缩系数有一定影响,掺量增大,最大干密度及压缩系数减小最优含水率增大;水泥掺量、养护龄期、密实度对改良土强度影响表现为内摩擦角、粘聚力、无侧限抗压强度随这三个指标值的增大而增大。通过扫描电镜照片从微观角度直观分析得出水泥改良土通过改变土体的颗粒大小、形状、连接方式,胶结状态等来改变土体的物理力学性质。
In order to expand the use of ground-based filler in the loess area, a loess soil in a certain area is taken as an example to test cement-modified soil. The results show that the cement content has some influence on the maximum dry density, the optimum moisture content and the compressibility of modified soil. The content of cement increases, the maximum dry density and compressibility decrease, the optimal moisture content increases. The effect of curing age and compaction on the strength of improved soil is that the internal friction angle, cohesion and unconfined compressive strength increase with the increase of these three indexes. From the microscopic point of view, it can be concluded from the microscopic view that the cement-modified soil can change the physical and mechanical properties of the soil by changing the particle size, shape, connection, and cementation status of the soil.