Distribution law of soil settlement caused by unsteady dewatering of confined water

作者：Wang Chunbo^*; Ding Wenqi; Liu Wenjun; Qiao Yafei

来源：Journal of Tongji University(Natural Science), 2013, 41(3): 361-367.

DOI：10.3969/j.issn.0253-374x.2013.03.008

• Confined aquifers
• Displacement solution
• Soil parameters
• Soil settlements
• Unsteady seepage

Decompression and dewatering in confined aquifer is essentially an unloading process, and the overlaying soil settlement of confined aquifer can be calculated with the derive formulas based on the elastic half-space of Mindlin displacement solution. Analysis shows that influence of dewatering time of unsteady seepage in infinite confined aquifer on soil settlement is significant in comparison with the steady seepage. Soil settlement caused by decompression and dewatering of confined water increases with the increase of the distance to the ground and the maximum value emerges on the roof of the confined aquifer. Of the seven parameters affecting the ground settlement, Poisson ratio and the confined aquifer permeability coefficient affect the ground settlement little. Ground settlement decreases gradually with the increase of overlaying soil thickness and the confined aquifer thickness. The influence of elastic modulus on ground settlement, which is great when its value is small, gradually weakens with the increase of elastic modulus. Ground settlement increases with the increase of out-water volume of single well and water head drawdown, furthermore, a quasi linear relationship exists between them. The out-water volume of single well, the confined aquifer thickness, the water head drawdown and the elastic modulus of overlaying soil affect not only the value of ground settlement, but also the spatial distribution of ground settlement.

• 出版日期2013
• 单位同济大学