重塑黄土高压固结变形特性试验研究

Experimental Research on High Pressure Consolidation Deformation Characteristics of Remolded Loess

针对延安地区黄土高填方填筑体在高应力下的变形特性,进行了控制含水率和压实度的高压固结试验,研究了含水率、压实度、固结压力对重塑黄土的变形特性的影响,以及各压缩指标与含水率、压实度之间的关系。试验结果表明:(1)从减小压缩变形的角度考虑,该高填方工程填筑体的含水率应控制在大于最优含水率的2%以内;(2)在该高填方工程填筑时应注意控制压实度在93%以上,从而能在一定程度上减少填筑体的沉降量;(3)孔隙比随着固结压力的增加而呈非线性减小;(4)判别出该类黄土为中等压缩性土,减小含水率和增大压实度,均能在一定程度上提高土的抗压缩性。

High pressure consolidation experiment which was about the control of moisture content and the de-gree of compaction were carried out. It was for the compressive deformation characteristics of high loess-filled pro-ject under high stress in Yan？an area. The influence of moisture content, degree of compaction and pressure on the compressive deformation characteristics of the remolded loess was studied, and the relationship between compression indices and the moisture content and compaction degree of the soil was also studied. The results show that ① in view of the decrease of compression deformation, the moisture content of high loess-filled embankment should not be greater than the optimum moisture content of 2% ; ② the degree of compaction should be controlled in 93% or more, which can reduce the settlement of the embankment to a certain extent; ③ the void ratio decreases non-line-arly with increasing pressure; ④ the loess is medium compressibility. Reducing the moisture content and increasing the degree of compaction can improve the anti-compression of the soil to a degree.