Modelling smear effect of vertical drains using a diameter reduction method  

作　　者：Zhichao Shen Siau Chen Chian Siew Ann Tan Chun Fai Leung 

机构地区：[1]School of Marine Science and Engineering,South China University of Technology,Guangzhou,China [2]Department of Civil and Environmental Engineering,National University of Singapore,Singapore

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第1期279-290,共12页岩石力学与岩土工程学报（英文版）

基　　金：The authors wish to acknowledge the generous financial sup-port from the Singapore Maritime Institute(SMI)for this research within the project‘Evaluation of In-situ Consolidation of Dredged and Excavated Materials at Reclaimed Next Generation Tuas Port’(Project ID:SMI-2018-MA-01).

摘　　要：Vertical drains are used to accelerate consolidation of clays in ground improvement projects.Smear zones exist around these drains,where permeability is reduced due to soil disturbance caused by the installation process.Hansbo solution is widely used in practice to consider the effects of drain discharge capacity and smear on the consolidation process.In this study,a computationally efficient diameter reduction method(DRM)obtained from the Hansbo solution is proposed to consider the smear effect without the need to model the smear zone physically.Validated by analytical and numerical results,a diameter reduction factor is analytically derived to reduce the diameter of the drain,while achieving similar solutions of pore pressure dissipation profile as the classical full model of the smear zone and drain.With the DRM,the excess pore pressure u obtained from the reduced drain in the original un-disturbed soil zone is accurate enough for practical applications in numerical models.Such performance of DRM is independent of soil material property.Results also show equally accurate performance of DRM under conditions of multi-layered soils and coupled radial-vertical groundwater flow.

关 键 词：CONSOLIDATION Vertical drain Smear effect Pore pressure Soil improvement 

分 类 号：P618.13[天文地球—矿床学]