固化垃圾土路基沉降变形特性研究

Study on Deformation Characteristics of Stabilized Garbage Soil Subgrade

采用垃圾土作为高速公路路基填料,对比素垃圾土和固化垃圾土路基的沉降量、土压力、水平位移等参數的变化规律,研究了废土路基的沉降变形特征,测试了固化垃圾土对路基变形的控制作用。结果表明:(1)采用水泥、水玻璃和CaCl2组成的固化剂对兴延高速沿线附近的垃圾土有很好的固化效果。(2)添加固化剂可有效控制路基沉降;随荷载增大和时间增长,沉降量增大;在间歇填充间隔期间,沉降变化很小。(3)固化垃圾土地基和素垃圾土地基的土压力均随荷载的增加而增大;当填充速度加快时,土压力增加得更快。(4)固化垃圾土地基和素垃圾土地基的水平位移在施加荷载前期均较小,随着负荷的增加,素垃圾土地基的水平位移比固化的垃圾土增长得更快。

In this paper, garbage soil is adopted as the subgrade filler of highway, and the variation rules of parameters such as subsidence amount, soil pressure and horizontal displacement between plain garbage soil and solidified garbage soil subgrade are compared, so as to study the deformation characteristics of garbage soil subgrade and test the effect of solidified garbage soil in controlling subgrade subsidence. The results show that:(1) the solidifying agent composed of cement, water glass and CaCl2 has a good curing effect on the waste soil near the Xingyan Express.(2) Adding curing agent can effectively control the subgrade subsidence. The deformation becomes larger with the increase of load and time. during the interval of filling, the deformation remains basically unchanged.(3) The soil pressure of the solidified waste ground and the plain waste ground increases along with the load. When the filling is rapid, the slil pressure increases faster.(4) The horizontal displacement of the solidified garbage soil foundation and the plain garbage soil foundation is not large in the early stage of loading. In the later stage, with the gradual increase of load, the horizontal displacement of foundation soil begins to increase, especially the horizontal displacement of plain waste soil foundation increases faster than that of solidified garbage soil.