工程地质学报2018，Vol.26Issue(2)：416-421,6.DOI:10.13544/j.cnki.jeg.2017-048
石灰改性红砂岩残积土工程性质试验研究
ENGINEERING PROPERTIES OF LIME-MODIFIEDRED SANDSTONE RESIDUAL SOIL
摘要
Abstract
This paper examines the engineering properties of lime-modified red sandstone residual soil,and determines the best dosage.It takes the red sandstone residual soil in Enshi,Hubei province as a case.It prepares the modified soil samples with different lime contents,and carries out compaction,compression,unconfined compression tests.The results show that,as the lime content increases,the optimum water content of modified soil gradually increases,the maximum dry density gradually decreases,the compression modulus of modified soil decreases first and then increases,the compressive modulus increases first and then decreases.The corresponding optimum lime content is 7％.The unconfined compressive strength of the modified soil increases first and then decreases,the optimum lime content is 9％.The main reasons for above results are that the hydration,ion exchange,carbonation and crystallization of lime can enhance the bonding of sand particles,and improve the integrity of the soil,thus,improves the compression and strength characteristics of the lime-modified soil.However,too much lime can appeare as free-ash between the gap of soil particles,which can lead to deformation increase and unconfined compressive strength decrease of the lime-modified soil.关键词
红砂岩残积土/石灰改性/工程性质/室内试验Key words
Red sand stone fine-grained soils/Lime-modified/Engineering properties/Laboratory test分类
建筑与水利引用本文复制引用
王章琼,高云,沈雷,潘登..石灰改性红砂岩残积土工程性质试验研究[J].工程地质学报,2018,26(2):416-421,6.基金项目
湖北省教育厅科研计划项目(B2017058)资助. （B2017058）
