基于沉降的堆场淤泥软基处理承载力预测方法

Predicting Method of Dredging Clay Bearing Capacity of in a Storage Yard Based on Measured Settlement

堆场软基处理中淤泥地基的承载力增长变化是工程中关注的焦点问题。为预测堆场淤泥在沉降背景下的地基承载力变化规律,以某清淤工程堆场为例,开展堆场疏浚淤泥的变形-强度室内试验,建立疏浚淤泥孔隙比-有效应力-固结不排水剪切强度的定量关系。以太沙基一维固结理论为基准,提出疏浚淤泥地基沉降变形计算方法,引入孔隙比与固结不排水剪切强度的经验关系,构建以孔隙比为计算变量的堆场淤泥地基承载力预测方法。研究表明:淤泥孔隙比-固结不排水剪切强度的内在联系与当前应力水平下淤泥的孔隙比和液限孔隙比相关,提出与变形相关的承载力预测方法能够准确估算地基承载力,与实测数据对比,计算精度误差在20%以内。

The fluctuation in the bearing capacity of the sediment foundation during soft ground treatment is a critical concern in engineering.Therefore,in order to predict the change rule of foundation bearing capacity of landfill silt under the background of settlement,this work take a dredging project landfill as an example,and carry out a large number of indoor tests of deformation-strength of landfill dredged silt,and established the quantitative relationship between the pore ratio of dredged silt-effective stress-solidification and undrained strength.By adopting Terzaghis one-dimensional consolidation theory,a method for calculating settlement and deformation of the dredged sediment foundation was proposed.This method incorporates an empirical relationship between porosity and undrained strength,thereby developing a bearing capacity prediction approach for the storage yard sediment foundation,with porosity as the variable in the calculations.The research reveals the intrinsic connection between sediment porosity and undrained strength,under the current stress levels,correlates with the sediments porosity and liquid limit porosity.The proposed deformation-related bearing capacity prediction method can accurately estimate the foundation s bearing capacity.When compared with measured data,the computational accuracy error is within 20%.