Intermittent swelling and shrinkage of a highly expansive soil treated with polyacrylamide  

作　　者：Amin Soltani An Deng Abbas Taheri Brendan C.O’Kelly 

机构地区：[1]School of Engineering,Information Technology and Physical Sciences,Federation University,Churchill,VIC,3842,Australia [2]School of Civil,Environmental and Mining Engineering,The University of Adelaide,Adelaide,SA,5005,Australia [3]Department of Civil,Structural and Environmental Engineering,Trinity College Dublin,Dublin,D02 PN40,Ireland

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2022年第1期252-261,共10页岩石力学与岩土工程学报（英文版）

基　　金：funded by the Australian Research Council(ARC),Project No.DP140103004。

摘　　要：This laboratory study examines the potential use of an anionic polyacrylamide(PAM)-based material as an environmentally sustainable additive for the stabilization of an expansive soil from South Australia.The experimental program consisted of consistency limits,sediment volume,compaction and oedometer cyclic swell-shrink tests,performed using distilled water and four different PAM-to-water solutions of P_(D)=0.1 g/L,0.2 g/L,0.4 g/L and 0.6 g/L as the mixing liquids.Overall,the relative swelling and shrinkage strains were found to decrease with increasing number of applied swell-shrink cycles,with an‘elastic equilibrium’condition achieved on the conclusion of four cycles.The propensity for swelling/shrinkage potential reduction(for any given cycle)was found to be in favor of increasing the PAM dosage up to P_(D)=0.2 g/L,beyond which the excess PAM molecules self-associate as aggregates,thereby functioning as a lubricant instead of a flocculant;this critical dosage was termed‘maximum flocculation dosage’(MFD).The MFD assertion was discussed and validated using the consistency limits and sediment volume properties,both exhibiting only marginal variations beyond the identified MFD of P_(D)=0.2 g/L.The accumulated axial strain progressively transitioned from‘expansive’for the unamended soil to an ideal‘neutral’state at the MFD,while higher dosages demonstrated undesirable‘contractive’states.

关 键 词：Expansive soil Polyacrylamide(PAM) Consistency limits Sediment volume Swell-shrink cycles Swelling and shrinkage strains Accumulated axial strain 

分 类 号：TU443[建筑科学—岩土工程]