矿渣和石灰改良膨胀土力学性能直剪试验研究

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中图分类号：TQ177.2 文献标志码：A文章编号：1001-5922（2025）05-0064-05

Abstract：The expansive soil slag can be efectively reduced by the resource utilization of expansive soil after slag lime improvement，but the mechanical properties of expansive soil modified by slag lime are not clear.Therefore，the shear strength characteristics of improved expansive soil samples with different curing ages were studied by direct shear test.The results showed that the cohesion of the slag-lime modified expansive soil sample after 28 days of curing reached more than 5 times thatof the unimproved expansive soil.The internal friction angle was more than 1.39 timesof the internal friction angleof theunimproved expansivesoil.With theincrease of theoverlying stress，the britleness indexand dilatationangleof the slag-lime improved sample graduallydecreased，andthe deformationbehaviorof the slag-lime improved sample gradualytransformed fromdilatancy toshear contraction.The shear behavior of the unimproved expansive soil sample was shear-hardening，butthe shear behavior of thesample after the improvement of slag lime became dilatation-softening，and the research resultscan provide a theoretical reference for the improvement and utilization of expansive soil.

Key words：slag lime；expansive soil improvement；shear strength；shear behavior膨胀土在我国西南地区广泛分布，随着西南地 区交通建设事业的蓬勃发展，高速铁路建设及高速

公路建设不可避免地要穿过膨胀土地区。（剩余6008字）