降水引起成层土附加应力及地表沉降的研究

考虑土体分层的特点,提出降水引起成层土附加应力的六种分布模式。按照等应力面积的原则将不同分布模式的附加应力换算成矩形分布,并以表格形式给出应力换算相关参数的计算方法,方便直接查询应用。结合工程实例,根据基坑工程实际降水数据,利用本文方法计算出降水引起的地表沉降值,与实测数据进行对比分析。文章进一步分析了导致计算值与实测值差异的原因,并提出相应的修正方法,使地表沉降计算值与实测值更加吻合。本文方法为计算工程降水引起的地表沉降提供了参考。

Research on Additional Stress and Ground Settlement Caused by Dewatering in Layered Soils

Considering the characteristics of soil stratification, six distribution patterns of additional stress caused by dewatering in soils were provided. Different distribution patterns such as triangular, trapezoidal or composite forms were converted to rectangular pattern, according to the principle of equal stress area, and relevant parameters were given in tabular form to facilitate inquiries and reference for further use in practice. Combined with specific engineering work, the ground settlement was calculated based on the monitoring value of dewatering depth with the method discussed in the paper. The calculated value and measured data were compared to find out possible reasons leading to difference between them. Furthermore, detailed analysis was carried out and one correction method was put forward to modify the calculated value in order to make it consistent with the measured data. The method discussed in this paper may offer a reference to calculate ground settlement caused by dewatering in other similar projects.