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近海环境下沉积的软粘土工程性质差,常具有较强的触变性和流变性,在地下水位反复波动的情况下,软土层会发生明显的沉降变形和回弹变形。为研究非饱和软土在地下水位波动下的变形特性,对取自于上海地下水位波动带内的非饱和软土进行试验。利用常规的固结仪,通过多次人工加水、排水模拟水位的循环升降,总结水位波动及波动次数对非饱和软土变形影响的规律,并讨论产生相应规律的机理。为解释地下水抽取与回灌形成的水位波动及工程施工荷载耦合作用下非饱和软土的变形规律提供依据。
The soft clay deposited in offshore environment has poor engineering properties and often has strong thixotropy and rheology. Under the fluctuating groundwater level, obvious deformation and springback will occur in soft soil. In order to study the deformation characteristics of unsaturated soft soil under fluctuation of groundwater level, the unsaturated soft soil in the fluctuation zone of groundwater level in Shanghai was tested. By means of conventional consolidation machines, the law of the influence of fluctuating water level and fluctuating times on the deformation of unsaturated soft soil is summarized and the mechanism of producing corresponding laws is discussed through repeated artificial water addition and drainage. This study provides the basis for explaining the water level fluctuation caused by groundwater extraction and recharge and the deformation of unsaturated soft soil under the coupling of engineering construction loads.