Performance of marine clay stabilised with vacuum pressure: Based on Queensland experience  

作　　者：Buddhima Indraratna Cholachat Rujikiatkamjorn Pankaj Baral Jayantha Ameratunga 

机构地区：[1]Industrial Transformation Training Centre(ITTC)for Advanced Technologies in Rail Track Infrastructure&Centre for Geomechanics and Railway Engineering(CGRE),School of Civil,Mining and Environmental Engineering,University of Wollongong,Wollongong City,NSW 2522,Australia [2]School of Civil,Mining and Environmental Engineering,University of Wollongong,Wollongong City,NSW 2522,Australia [3]Centre for Geomechanics and Railway Engineering,University of Wollongong,Wollongong City,NSW 2522,Australia [4]Golder Associates Pty Ltd.,Milton,Queensland 4064,Australia

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2019年第3期598-611,共14页岩石力学与岩土工程学报（英文版）

基　　金：the support of the Port of Brisbane Pty Ltd;Coffey Geotechnics;research funding from the Australia Research Council

摘　　要：Stabilising soft marine clay and estuarine soils via vacuum preloading has become very popular in Australasia over the past decades because it is a cost-effective and time-efficient approach.In recent times,new land on areas outside but adjacent to existing port amenities,the Fisherman Islands at the Port of Brisbane(POB),was reclaimed to cater for an increase in trade activities.A vacuum preloading method combined with surcharge to stabilise the deep layers of soil was used to enhance the application of prefabricated vertical drains(PVDs).This paper describes the performance of this combined surcharge fill and vacuum system under the embankment and also compares it with a surcharge loading system to demonstrate the benefits of vacuum pressure over conventional fill.The performance of this embankment is also presented in terms of field monitoring data,and the relative performance of the vacuum together with non-vacuum systems is evaluated.An analytical solution to radial consolidation with time-dependent surcharge loading and vacuum pressure is also presented in order to predict the settlement and associated excess pore water pressure(EPWP)of deposits of thick soft clay.Stabilising soft marine clay and estuarine soils via vacuum preloading has become very popular in Australasia over the past decades because it is a cost-effective and time-efficient approach. In recent times, new land on areas outside but adjacent to existing port amenities, the Fisherman Islands at the Port of Brisbane(POB), was reclaimed to cater for an increase in trade activities. A vacuum preloading method combined with surcharge to stabilise the deep layers of soil was used to enhance the application of prefabricated vertical drains(PVDs). This paper describes the performance of this combined surcharge fill and vacuum system under the embankment and also compares it with a surcharge loading system to demonstrate the benefits of vacuum pressure over conventional fill. The performance of this embankment is also presented in terms of field monitoring data, and the relative performance of the vacuum together with non-vacuum systems is evaluated. An analytical solution to radial consolidation with time-dependent surcharge loading and vacuum pressure is also presented in order to predict the settlement and associated excess pore water pressure(EPWP) of deposits of thick soft clay.

关 键 词：Soft CLAY PREFABRICATED vertical drains(PVDs) Vacuum CONSOLIDATION Membrane-less SYSTEM MEMBRANE SYSTEM 

分 类 号：O3[理学—力学]