Revisiting mixing uniformity effect on strength of cement-based stabilized soft clay  

作　　者：Tingting Deng Yongfeng Deng Marsheal Fisonga Songyu Liu Yunsong Wu Hao Dai 

机构地区：[1]Institute of Geotechnical Engineering,School of Transportation,Southeast University,Nanjing,211189,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第12期5221-5230,共10页岩石力学与岩土工程学报（英文）

基　　金：supported by the National Key R&D Program of China(Grant No.2019YFC1806004);the National Natural Science Foundation of China(Grant Nos.42272322 and 51878159).

摘　　要：Despite the fact that mixing uniformity(i.e.the consistency of binder distribution)significantly influence the quality of ground improvement during in situ soil mixing projects,its quantitative evaluation was rarely concerned due to the difficulty of measurement from an engineering perspective.A methodology was proposed to quantitatively evaluate the mixing uniformity of stabilized soil using handheld Xfluorescence spectrometry(XRF),which is helpful to elucidate the significance of mixing uniformity on strength.In other words,the calcium content was monitored to ascertain the distribution of cement within the matrix,and a quantitative index was subsequently established.It was observed that an increase in mixing uniformity resulted in a transition in the behavior of the stabilized clay from a plastic to a brittle failure mode,and from a localized failure to a global shear failure under unconfined compression.Subsequent observation of the destruction process revealed that cracks were more readily formed in the low cement zones and then bypass the high cement zones.Furthermore,the effect of mixing uniformity on strength is likely to be amplified with prolonged curing periods.The enhancement of uniformity would increase the volume of the high binder zones,thereby enhancing the overall highstrength performance.The proposed methodology is capable of characterizing the discreteness between the tracked element's measured and theoretical contents,thusing avoiding the uncertainty associated with other indirect indicators.The convenience of the portable handheld XRF apparatus was confirmed,as it can be readily deployed in situ or ex situ to track calcium content within the stabilized mass after borehole sampling.

关 键 词：Cement-based stabilized soft clay(CBSC) Mixing uniformity Quantitative evaluation method Unconfined compressive strength(UCS) Internal mechanism 

分 类 号：TU43[建筑科学—岩土工程]