抽水地面沉降中含水层长期变形特性研究

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Abstract The field monitoring data of land subsidence in Yangtze River delta area demonstrates that the deformation in the aquifers accounts for a large proportion of the total settlement and develops with time. There are many parameters in the existing sand creep models；however，it is difficult to obtain relative accurate parameters. According to the creep characteristics of sand，the Singh′s soil creep model was adopted to calculate the long-term deformation of aquifers in this study. This model assumes that the creep rate and time present linear relationship in the double logarithmic coordinates. There is only one parameter m needed in this model，which stands for the line slope of the creep rate and time elapse in the double logarithmic coordinates. The statistical results of the existing sand creep test data show that，the values of m are 0.9–1.1. The sensitivity analysis of m shows that the different values of m in the range of 0.9–1.1 cannot affect the creep deformation significantly. Therefore，the value of m can be assumed as 1 when specific test data is not available. Two cases of Changzhou and Shanghai are given to demonstrate the effectiveness of Singh′s model and accuracy of the proposed method in long-term deformation of sand aquifers calculation.

Key words： soil mechanics land subsidence caused by groundwater withdrawal long-term deformation in sand aquifers sand creep value of m sensitivity analysis

Received: 25 March 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/IS1/3135

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