CAJ | 학술논문

本文以三峡库区广泛分布的风化砂来改良膨胀土，通过在膨胀土中掺入10％、20％、30％、40％、50％的风化砂，进行1、3、6、9、12次冻融循环，最后对不同冻融循环次数作用后改良膨胀土制备样进行直接剪切试验，测定不同掺砂量及不同冻融次数下，各试样的强度参数，得出冻融循环对风化砂改良膨胀土抗剪强度指标及强度规律的影响。试验结果表明：在同一掺砂比例下，风化砂改良膨胀土的抗剪指标和抗剪强度随冻融循环次数的增大而减小，最后逐渐趋于稳定，其中黏聚力与冻融循环次数呈对数关系；在同一冻融循环次数下，黏聚力随掺砂比例的增大而减小，内摩擦角随掺砂比例的增大而增大。
본문이삼협고구엄범분포적풍화사래개량팽창토，통과재팽창토중참입10％、20％、30％、40％、50％적풍화사，진행1、3、6、9、12차동융순배，최후대불동동융순배차수작용후개량팽창토제비양진행직접전절시험，측정불동참사량급불동동융차수하，각시양적강도삼수，득출동융순배대풍화사개량팽창토항전강도지표급강도규률적영향。시험결과표명：재동일참사비례하，풍화사개량팽창토적항전지표화항전강도수동융순배차수적증대이감소，최후축점추우은정，기중점취력여동융순배차수정대수관계；재동일동융순배차수하，점취력수참사비례적증대이감소，내마찰각수참사비례적증대이증대。
This paper investigates the qualitative and quantitative relationships among shear strength of weathered sand improved with expansive soil,weathered sand content and cycle times of freeze-thaw tests.The expansive soil is added with weathered sand with the percentages of 0,10%,20%,30%,40%,50%,respectively.The shear strength test is done using direct shear apparatus on the samples after 0,1,3,6,9,12 cycles of freezing and thawing.Test results show that as the cycles of freeze-thaw increases,the shear indexes and the shear strength of weathered sand improved expansive soil first increase and then decrease and gradually reach stable after several times of freeze-thaw cycles for samples with the same sand ratio.The relationship between cohesive force and freeze-thaw cycles can be expressed in logarithmic function.As the mixed sand ratio increases,the cohesion decrease but the internal frictional angle increases for samples with the same cycles of freeze and thaw.