ISS改性强膨胀土胀缩和强度特性试验研究

Experimental Study on Swell-Shrink Characteristics and Strength Properties of Ionic Soil Stabilizer Improved Expansive Soil

运用离子土壤固化剂(ISS)对南阳强膨胀土进行改良试验研究。依据不同配比改性土的液塑限和自由膨胀率试验结果,选定ISS溶液改良该膨胀土的最优配合比为1∶300,对膨胀土改性前后的脱湿和吸湿过程进行了试验研究。结果表明:在脱湿试验中,ISS能够较好地抑制膨胀土的垂直收缩,但不能抑制膨胀土的水平收缩;在吸湿试验中,吸湿膨胀稳定时,素土的膨胀增幅为1.72 mm,ISS改性土的膨胀增幅为1.36 mm,ISS能够较好地抑制膨胀土的膨胀性;在抗剪强度试验中,ISS能够增大膨胀土的黏聚力和内摩擦角,改变率分别达59.33%和4.96%,使其工程性质得到较好的改良。

The improving expansive soil of Nanyang by experiment with ionic soil stabilizer was studied. Through free swelling ratio and liquid - plastic limit, the optimal of ISS solution was identified as 1 ： 300. It did tests while syneresis and water swelling for expansive soil before and after modification. The soil test results show that in the moisture test, ISS can inhibit the vertical line indentation of expansive soil, but it cannot inhibit the level line indentation of expansive soil; in moisture absorption experiment, when the hygroscopic expansion is stable, the thickness swelling of expansive soil is 1.72 mm and the thickness swelling of improving expansive soil is 1.36 mm, so the ISS can inhibit the expansion of the expansive soil ; in shear strength test, ISS can increase the cohesive and internal friction angle of expansive soil and its engineering properties are well improved.