摘要
为研究水泥掺量、压实度及养护龄期对重塑黄土物理力学性能的影响,通过配置不同水泥掺量的重塑黄土,开展不同压实度和养护龄期条件下的直剪和无侧限抗压强度试验。对比分析水泥掺量和压实度对重塑黄土抗压、抗剪强度的影响规律以及养护龄期对抗压强度的影响规律,采用方差分析法研究了水泥掺量和压实度对重塑黄土强度的影响,并分析了无侧限抗压试样的破坏形式。研究表明:试样龄期为7 d的黏聚力和无侧限抗压强度随水泥掺量呈先增大后减小,而内摩擦角先非线性增加后趋于稳定,水泥掺量为14%时重塑黄土的黏聚力和和无侧限抗压强度最大;黏聚力和无侧限抗压强度随压实度线性增大;无侧限抗压强度随养护龄期延长逐渐增大并趋于稳定,且与黏聚力表现出线性关系;水泥掺量和压实度均对重塑黄土强度有显著影响;无侧限抗压试样的压实度为75%时主要发生中部鼓胀破坏,压实度为90%时主要发生劈裂破坏。研究成果可为地基处理、边坡加固、人工边坡回填等工程提供参考。
In order to study the effects of cement content,compactness and curing age on the physical and mechanical properties of remodeled loess,in this paper,the direct shearing test and unconfined compressive strength test under the conditions of different compaction degrees and curing age are carried out by configuring the remodeled loess with different cement content.The effect of cement content and compaction degree on the compressive and shear strength of remodeled loess and the effect of curing age on compressive strength are compared and analyzed.The variance analysis method is used to study the effect of cement content and compaction degree on the strength of remodeled loess,and the failure modes of unconfined compression specimens are analyzed.The research shows that the cohesion and unconfined compressive strength of the sample aged 7 days increase first and then decrease with the cement content,while the internal friction angle first increases nonlinearly and then tends to be stable,and when the volume of cement is 14%,the cohesion and unconfined compressive strength of the remodeled loess are the largest.The cohesion and unconfined compressive strength increase linearly with the compactness.The unconfined compressive strength increases gradually with the curing age and tends to be stable,and shows a linear relationship with the cohesion.Both the cement content and the degree of compaction have a significant effect on the strength of the reshaped loess.When the compactness of the unconfined compressive specimen is 75%,the bulging failure mainly occurs in the middle,and the splitting failure occurs when the compaction degree is 90%.The research results can provide reference for foundation treatment,slope reinforcement,artificial slope backfill and other projects.
作者
马晓武
马云峰
刘安龙
唐磊
殷珂
蓟文豪
MA Xiao-wu;MA Yun-feng;LIU An-long;TANG Lei;YIN Ke;JI Wen-hao(Machine Industry Investigation Design Institute Co.Ltd.,Xi'an 710043,China;Shaanxi Provincial Key Laboratory for the Property and Treatment of Special Soil and Rock,Xi'an 710043,China;School of Civil Engineering and Architecture,Chang'an University,Xi'an 710061,China)
出处
《公路》
北大核心
2023年第3期309-315,共7页
Highway
基金
国家自然科学基金,项目编号42077248,41877285。
关键词
重塑黄土
水泥掺量
压实度
无侧限抗压强度
抗剪强度
方差分析
破坏形态
remodeling loess
cement content
compaction
unconfined compressive strength
shear strength
variance analysis
mode of failure
