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一、概况云南曲靖地区位于低丘缓坡上,地面1米以下均为第三系湖相粘土层,具有吸水膨胀,失水收缩的特点。取样试验分析的结果表明,曲靖地区的粘土主要是伊利石-蒙脱石混合矿物。粘土颗粒含量小于2μ的为40~51%,SiO_2成分为56.2~62.1%。曲靖地区膨胀土的物理力学性能及胀缩性指标见表1。近年来,我们采用换填砂或砂石垫层等措施并在房屋四周做防水保湿来处理膨胀土
I. Overview Qujing, Yunnan Province is located on a gentle slope on a low hill. The clay below 1 meter below the surface is a tertiary clay-like clay layer with the characteristics of water swelling and shrinkage. The results of sampling tests show that the clay in the Qujing area is mainly illite-smectite mixed minerals. The clay particle content is less than 2μ for 40 to 51%, and the SiO 2 component is 56.2 to 62.1%. See Table 1 for physical and mechanical properties and swelling and shrinkage index of expansive soil in Qujing. In recent years, we have used measures such as refilling with sand or sand cushions and doing waterproof moisturizing to treat expansive soil around the house.