摘要
为研究水泥-玄武岩纤维复合固化方案对于滇池地区高原湖相泥炭质土的动力特性的改良效果,对不同掺量水泥、水泥-玄武岩纤维复合固化剂的固化泥炭质土进行室内动三轴试验,研究了不同掺量的水泥与水泥-玄武岩纤维复合固化剂、围压、加载频率对改良泥炭质土的滞回曲线的影响。研究表明改良泥炭质土的滞回曲线形状呈两端狭长的长梭形;随着掺量、围压、加载频率的增大,水泥固化土和复合固化土的滞回曲线均向动应力轴偏转,土体的刚度和弹性性能有不同程度地增大,而对于外界能量的耗散能力也有着不同程度地减弱。在相同试验条件下,复合固化土比水泥固化土的土体刚度和弹性性能更大,动应变幅值、残余塑性变形也比之减小。试验结果分析表明,水泥-玄武岩纤维复合固化剂掺量为15%~20%时可以取得较好地经济效益比。
To study the improvement effectiveness of cement basalt fiber composite curing scheme on the dynamic characteristics of plateau lacustrine peat soil in Dianchi Lake area,indoor dynamic triaxial tests were carried out on the cured peat soil with different amounts of cement and cement basalt fiber composite curing agent,confining pres⁃sure,and loading frequency on the hysteretic curve of improved peat soil.The results show that the shape of hystere⁃sis curve of improved peat soil is a long shuttle with narrow ends.With the increase of the content,confining pres⁃sure,and loading frequency,the hysteretic curves of cement solidified soil and composite solidified soil deflect to the dynamic stress axis;the stiffness and elastic properties of soil increase in varying degrees;the dissipation capacity of external energy decreases in varying degrees.Under the same test conditions,the soil stiffness and elastic properties of composite solidified soil are greater than those of cement solidified soil,and the dynamic strain amplitude and re⁃sidual plastic deformation also reduced.As the content of cement basalt fiber composite curing agent is 15%~20%,a better economic benefit ratio can be obtained.
作者
王卓
屈俊童
刘超
张翔
朱云强
WANG Zhuo;QU Juntong;LIU Chao;ZHANG Xiang;ZHU Yunqiang(School of Architecture and Planning,Yunnan University,Kunming 650504,China;Weifang Jinke Construction Investment Co.,Ltd.,Shandong Weifang 261000,China)
出处
《低温建筑技术》
2022年第5期9-14,共6页
Low Temperature Architecture Technology
基金
云南省教育厅科学研究基金(2019J0024)。
