CAJ | 학술논문

针对合肥地区非饱和膨胀土进行单轴压缩蠕变试验，根据应变-时间关系曲线，探讨该区非饱和膨胀土的蠕变特性。试验结果显示：非饱和膨胀土蠕变经历两个阶段，即瞬时弹性蠕变阶段和稳定蠕变阶段。瞬时弹性阶段时间比较短，蠕变快，很快进入蠕变稳定阶段，蠕变稳定阶段持续时间很长。在相同含水率情况下，应力作用值越大，瞬时弹性蠕变量越大，稳定蠕变阶段时间越久；在相同应力作用下，含水率越大，瞬时弹性蠕变量越大。在40 kPa的小应力作用下，应变-时间呈线性关系；在100 kPa、200 kPa的较大应力作用下，应变-时间呈非线性关系，拟合函数为对数函数。
침대합비지구비포화팽창토진행단축압축연변시험，근거응변-시간관계곡선，탐토해구비포화팽창토적연변특성。시험결과현시：비포화팽창토연변경력량개계단，즉순시탄성연변계단화은정연변계단。순시탄성계단시간비교단，연변쾌，흔쾌진입연변은정계단，연변은정계단지속시간흔장。재상동함수솔정황하，응력작용치월대，순시탄성연변량월대，은정연변계단시간월구；재상동응력작용하，함수솔월대，순시탄성연변량월대。재40 kPa적소응력작용하，응변-시간정선성관계；재100 kPa、200 kPa적교대응력작용하，응변-시간정비선성관계，의합함수위대수함수。
The expansive soil’ s creep characteristics are explored based on the uniaxial compression creep test of unsaturated expansive soil in Hefei area, combining the strain-time curve. The test results show that the ex-pansive soil creep undergoes two different stages: the instantaneous elastic creep stage and the steady creep stage. At the same moisture content, stress is greater, the greater the instantaneous elastic creep lasts, the longer steady creep stage time is;under the same stress, the higher the moisture content, the greater the in-stantaneous elastic creep is. In the same moisture content condition, when stress is greater, the instantaneous elastic creep is greater, steady creep stage time is longer;in the same stress condition, when moisture content is higher, the instantaneous elastic creep is higher. Under the action of stress such as 40 kPa, strain-time is linear;under the action of stress such as 100 kPa or even 120 kPa, strain-time relationship is non-linear, the fitting function is logarithmic function.