冻融作用下土体无侧限抗压强度变化研究  

Study on the Variation of Unconfined Compressive Strength of Soil Under Freeze-Thaw Action

作　　者：张亚英 ZHANG Yaying(Gansu Corps,China Geological Exploration Center for Building Materials Industry)

机构地区：[1]中国建筑材料工业地质勘查中心甘肃总队

出　　处：《广东建材》2024年第2期30-33,共4页Guangdong Building Materials

摘　　要：通过设置不同冻融循环温度和循环次数,开展了冻融循环下原状黄土和重塑黄土的无侧限抗压强度试验,研究结果表明:原状黄土在不同冻融温度下,随着提高冻融循环次数,土体无侧限抗压强度均呈现为持续降低趋势,黄土经过冻融循环后,原本土体结构受到严重破坏,降低了土体的抗压强度,且随着冻融循环温度的降低,黄土抗压强度的损失程度也越来越大;重塑土的无侧限抗压强度变化趋势和原状黄土大致相同,但重塑黄土0次冻融循环时的无侧限抗压强度与各次冻融循环后的强度差距较小,每次循环后的强度波动范围在2~8kPa内;冻融作用下,黄土渗透系数呈现出先增大后趋于稳定的规律,对其渗透系数影响较大的主要在前4次冻融循环。By setting different freeze-thaw cycle at different temperatures and times,unconfined compressive strength tests were conducted on undisturbed loess and remolded loess under freeze-thaw cycles.The research results show that under different freeze-thaw temperatures,as the number of freeze-thaw cycle times increased,the unconfined compressive strength of the loess showed a continuous decreasing trend.After the loess underwent freeze-thaw cycle,the original soil structure was severely damaged,reducing the compressive strength of the soil.And as the freeze-thaw cycle temperature decreases,the degree of loss of loess compressive strength also increases.The trend of unconfined compressive strength change of remolded loess is roughly the same as that of undisturbed loess,but the difference between the unconfined compressive strength of remolded loess after 0 freeze-thaw cycles and the strength after each freeze-thaw cycle is small,and the strength fluctuation range after each cycle is within 2-8kPa.Under the action of freeze-thaw,the permeability coefficient of loess shows a pattern of first increasing and then stabilizing,and the first four freeze-thaw cycles having a significant impact on its permeability coefficient.

关 键 词：冻融循环 原状黄土 无侧限抗压强度 土体结构 

分 类 号：TU43[建筑科学—岩土工程]