CAJ | 학술논문

离子固化剂（ISS）对膨胀土改良后，膨胀土稳定性会改善。为了分析研究不同初始含水率的膨胀土经过ISS改良效果，进行了膨胀土改良前后的剪切试验、界限含水率试验和自由膨胀率试验。通过改良前、后土体的抗剪强度、塑限、液限、塑限指数、自由膨胀率的变化规律研究，得出膨胀土的初始含水率在11％～30％区间时，改良后土体的膨胀性得到了消除，抗剪强度得到了明显提高；初始含水率不在11％～30％区间时土样改良后仍具有一定膨胀性，抗剪强度提高不明显。这是因为，当膨胀土烘干时，靠毛细吸力吸附的固化剂量不能与所有黏土颗粒进行反应；当膨胀土饱和时，靠溶液渗透到膨胀土表面的固化剂也不能与所有黏土颗粒进行反应。该试验结果对膨胀土现场改良时含水率的确定具有重要的指导意义。
리자고화제（ISS）대팽창토개량후，팽창토은정성회개선。위료분석연구불동초시함수솔적팽창토경과ISS개량효과，진행료팽창토개량전후적전절시험、계한함수솔시험화자유팽창솔시험。통과개량전、후토체적항전강도、소한、액한、소한지수、자유팽창솔적변화규률연구，득출팽창토적초시함수솔재11％～30％구간시，개량후토체적팽창성득도료소제，항전강도득도료명현제고；초시함수솔불재11％～30％구간시토양개량후잉구유일정팽창성，항전강도제고불명현。저시인위，당팽창토홍간시，고모세흡력흡부적고화제량불능여소유점토과립진행반응；당팽창토포화시，고용액삼투도팽창토표면적고화제야불능여소유점토과립진행반응。해시험결과대팽창토현장개량시함수솔적학정구유중요적지도의의。
The stability of expansive soil can be improved after its treatment with ionic stabilizer(ISS).Laboratory tests of direct shear,water ratio limit and free expansive rate are conducted,before and after the soil is meliorated, to analyze the ISS improvement effect on the expansive soils with different initial moisture contents.Results show that the expansibility of the soil has been eliminated.The shear strength is improved dramatically when the initial moisture content is at the range of 1 1%to 30%.However,little effects are revealed outside the boundaries.The ionic stabilizer is neither adsorbed by capillary suction when the soil is dried nor stuck to soil surface due to the penetration of the solution in saturated state can react with all the clay particles.Findings of the experiment are of great significance in determining the initial moisture content when site improvements on expansive soil with ISS.