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干湿循环作用对改良膨胀土的工程性质存在重要的影响,而目前这方面的研究成果很少。以掺石灰和粉煤灰改良的典型合肥膨胀土为研究对象,通过系统的室内试验,研究在干湿循环作用下,改良膨胀土的膨胀性、界限含水量、颗粒分布以及无侧限抗压强度等方面的变化规律,深入探讨干湿循环作用对改良膨胀土工程性质的影响。结果表明,改良膨胀土的膨胀量、液限、塑性指数、黏粒含量随干湿循环次数的增加而增大,而塑限、粉粒含量以及无侧限抗压强度则随干湿循环次数的增加而减小。
The role of wetting and drying cycle in improving the engineering properties of expansive soils has an important impact, and the current research results in this area are few. A typical Hefei expansive soil modified with lime and fly ash was studied. Through the systematic laboratory tests, the expansibility, boundary water content, particle distribution and unconfined compressive strength Strength and other aspects of the variation, in-depth discussion of wetting and drying cycles on the improvement of engineering properties of expansive soil. The results show that the expansive amount, liquid limit, plasticity index and clay content of the modified expansive soil increase with the increase of the number of wetting and drying cycles, while the plastic confinement, grain content and unconfined compressive strength increase with the number of wetting and drying cycles Increase and decrease.