Interrelation between compressibility and permeability of reconstituted sandy clays with different sand fractions  

作　　者：Mengying Gao Junjun Ni Zhenshun Hong 

机构地区：[1]Institute of Geotechnical Engineering,School of Transportation,Southeast University,Nanjing,211189,China [2]Jiangsu Key Laboratory of Low Carbon and Sustainable Geotechnical Engineering,Southeast University,Nanjing,211189,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第4期2461-2473,共13页岩石力学与岩土工程学报(英文)

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.52278334 and 4197724);Fundamental Research Funds for the Central Universities (Grant No.2242024k30066).

摘　　要：It has been well recognized that sand particles significantly affect the mechanical properties of reconstituted sandy clays,including the hosted clay and sand particles.However,interrelation between the permeability and compressibility of reconstituted sandy clays by considering the structural effects of sand particles is still rarely reported.For this,a series of consolidation-permeability coefficient tests were conducted on reconstituted sandy clays with different sand fractions(ψ_(ss)),initial void ratio of hosted clays(e_(c0))and void ratio at liquid limit of hosted clays(e_(cL)).The roles of ψ_(ss) in both the relationships of permeability coefficient of hosted clay(k_(v-hosted clay))versus effective vertical stress(σ'_(v))and void ratio of hosted clay(e_(c-hosted clay))versus σ'_(v) were analyzed.The results show that the permeability coefficient of reconstituted sandy clays(k_(v))is dominated by hosted clay(k_(v)=k_(v-hosted clay)).Both ψ_(ss) and σ'_(v) affect the k_(v) of sandy clays by changing the e_(c-hosted clay) at any given σ'_(v).Due to the partial contacts and densified clay bridges between the sand particles(i.e.structure effects),the e_(c-hosted clay) in sandy clays is higher than that in clays at the same σ'_(v)v.The k_(v)-e_(c-hosted clay) relationship of sandy clays is independent of σ'_(v) and ψ_(ss)but is a function of e_(cL).The types of hosted clays affect the k_(v) of sandy clays by changing the e_(cL).Based on the relationship between permeability coefficient and void ratio for the reconstituted clays,an empirical method for determining the k_(v) is proposed and validated for sandy clays.The predicted values are almost consistent with the measured values with k_(v-predicted)=k_(v-measured)=0.6-2.5.

关 键 词：Reconstituted clays Sand fractions Sandy clays Consolidation-permeability coefficient tests Void ratio of hosted clay Permeability coefficient 

分 类 号：TU411[建筑科学—岩土工程]