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膨胀土具有吸水膨胀,失水收缩的性质,给工程带来极大的危害。选取膨胀土及不同水泥掺量的改性膨胀土进行胀缩特性试验研究,确定南阳中膨胀土水泥改性的最佳掺量为6%。将其作为防护加固材料换填南水北调中线渠道边坡的表层,并利用测斜管和变形管等仪器设备对其防护效果进行现场监测。结果表明:1龄期28 d的水泥掺量为6%的改性膨胀土,当外荷载增加20 kPa,有荷膨胀率几乎为0;2水泥改性膨胀土回填覆盖坡面表层后,可以解决膨胀土渠坡的浅层失稳问题。
Expansive soil with water swelling, water shrinkage of the nature of the project to bring great harm. Select expansive soil and different amount of cement content of modified expansive expansive properties of experimental study to determine the best content of Nanyang expansive soil cement modified 6%. It will be used as a protective reinforcing material to replace the surface of the slope of the midline of the South-to-North Water Diversion Project, and on-site monitoring of the protective effect will be carried out by using instruments and equipment such as inclinometer pipes and deformation pipes. The results show that the modified expansive soil with cement content of 6% at the first instar stage is 6%. When the external load is increased by 20 kPa, the load expansion rate is almost zero. 2 After the cement-modified expansive soil is backfilled to cover the surface of the slope, Solve the problem of shallow instability of expansive soil channel slope.