摘要
为研究冻融循环对水泥石灰改良软土力学特性影响,通过不同冻融次数的无侧限抗压强度试验和直剪试验,得到了水泥及石灰剂量和冻融次数对改良软土力学特性影响规律。结果表明:水泥石灰改良软土冻胀率分别与水泥剂量、石灰剂量负相关,且冻融3次后冻胀率达到最大值后逐渐减小;无侧限抗压强度随冻融次数增加递减,冻融7次后抗压强度逐渐收敛;随着水泥剂量的提高,改良土抗压强度经历相同冻融次数后抗压强度减小速率逐渐趋向稳定,冻融10次后抗压强度较未冻融的改良土抗压强度分别平均降低了57%~63%;同一冻融次数下,各石灰剂量改良土内摩擦角随水泥剂量提高呈线性增长,3%石灰剂量改良土黏聚力与水泥剂量线性相关。
In order to study the effect of freeze-thaw cycles on the mechanical properties of cement-lime modified soft soil,unconfined compressive strength test and direct shear test were carried out under different freeze-thaw times,the effects of cement and lime dosage and freeze-thaw times on the mechanical properties of modified soft soil were obtained.The results show that the frost heave rate of cement lime modified soft soil is negatively correlated with cement dosage and lime dosage,and the frost heave rate reaches the maximum after freeze-thaw three times,then gradually decreases;the unconfined compressive strength decreases with the number of freeze-thaw cycles.After 7 times of melting,the compressive strength gradually converges;with the increase of cement dosage,the compressive strength of the modified soil undergoes the same number of freeze-thaw cycles,and the compressive strength decreases gradually toward a stable rate.After freezing and thawing for 10 times,the compressive strength is lower than that of unfrozen and thawing.The compressive strength of the improved soil decreased by 57%~63%on average.Under the same freezing and thawing times,the internal friction angle of each lime dosage increased linearly with the increase of cement dosage.The 3%lime dosage improved soil cohesion and cement dosage linearity related.
作者
梁家红
LIANG Jiahong(Gushi County Highway Administration,Xinyang 465200,China)
出处
《粉煤灰综合利用》
CAS
2020年第3期79-84,共6页
Fly Ash Comprehensive Utilization
关键词
冻融循环
改良软土
冻胀率
无侧限抗压强度
黏聚力
内摩擦角
freeze-thaw cycle
improved soft soil
frost heave rate
unconfined compressive strength
cohesion
internal friction angle
作者简介
梁家红(1975-),男,本科,高级工程师,主要从事道路与桥梁相关管理工作。
