CAJ | 학술논문

为了研究冻融循环对改良粉土强度的影响规律及其作用机制，开展了不同初始压实度和初始含水率试样的冻融循环试验。对经历不同冻融循环次数作用后的试样进行无侧限抗压强度试验，探讨了冻融循环作用对改良粉土的长期强度的影响规律。试验结果表明，随着冻融循环次数增加，改良粉土的抗压强度下降，最终在6次冻融循环后趋于稳定；相同的冻融循环次数条件下，初始含水率越大，改良粉土的抗压强度衰减幅度越大。为了寻找冻融循环作用对改良粉土孔隙结构的影响规律，进而揭示冻融循环对试样结构损伤的机制，开展了改良粉土的细观孔隙结构试验。试验结果表明，不同的冻融循环次数和初始含水率对小孔径孔隙（?10 nm）之间的结构影响不大；冻融循环作用主要损伤了大孔径孔隙（0.01～100μm）之间的结构，从而降低了改良粉土的强度。
위료연구동융순배대개량분토강도적영향규률급기작용궤제，개전료불동초시압실도화초시함수솔시양적동융순배시험。대경력불동동융순배차수작용후적시양진행무측한항압강도시험，탐토료동융순배작용대개량분토적장기강도적영향규률。시험결과표명，수착동융순배차수증가，개량분토적항압강도하강，최종재6차동융순배후추우은정；상동적동융순배차수조건하，초시함수솔월대，개량분토적항압강도쇠감폭도월대。위료심조동융순배작용대개량분토공극결구적영향규률，진이게시동융순배대시양결구손상적궤제，개전료개량분토적세관공극결구시험。시험결과표명，불동적동융순배차수화초시함수솔대소공경공극（?10 nm）지간적결구영향불대；동융순배작용주요손상료대공경공극（0.01～100μm）지간적결구，종이강저료개량분토적강도。
The freeze-thaw cycle tests are carried out under different compacted degrees and initial moisture contents to explore the mechanism and the influence of the long-term strength of improved silt under freeze-thaw cycle effect. And then, unconfined compressive strength tests after different freeze-thaw cycles are conducted. The influence law of the long-term strength of improved silt subjected to freeze-thaw cycle effect is discussed. It is found that the unconfined compressive strength decreases with the number of freeze-thaw cycles increasing. Finally, it reaches a stable stage after 6 freeze-thaw cycles. The higher initial moisture is, the more attenuation amplitude of the compressive strength is after the same number of the freeze-thaw cycles. In order to find out the influence law of the microscopic structure under the effect of freeze-thaw cycles, the microscopic tests of improved silt are carried out. And then the damage mechanism of the microscopic structure under the effect of freeze-thaw cycles is found out. It shows that different numbers of freeze-thaw cycles and initial moisture contents have less effect on the small pores (?10 nm). Freeze-thaw cycles have main influence on the large pores (0.01~100μm) between the soil aggregates, so it makes the strength of improved silt decreased.