制样拌和方法对木质素纤维改良黄土强度的影响  

Effect of mixing method of sample preparation on the strength of loess improved by lignin fiber

作　　者：高中南 王谦[1,2] 赵乘程[1] 郑龙[1] 马紫娟[1] 钟秀梅[1,2] GAO Zhongnan;WANG Qian;ZHAO Chengcheng;ZHENG Long;MA Zijuan;ZHONG Xiumei(Lanzhou Institute of Seismology, CEA, Lanzhou 730000, Gansu, China;Key Laboratory of Loess Earthquake Engineering, CEA, Lanzhou 730000, Gansu, China)

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]中国地震局黄土地震工程重点实验室,甘肃兰州730000

出　　处：《地震工程学报》2021年第4期930-934,共5页China Earthquake Engineering Journal

基　　金：甘肃省地震局地震科技发展基金项目(2019Q08,2016M04,2015ZB01);地震科技星火计划项目(XH20057);国家自然科学基金项目(51778590)。

摘　　要：为减小室内试验中得到的木质素纤维改良黄土试样试验数据的离散程度,对采用稀释拌和法与直接拌和法制备的改良黄土试样分别进行了无侧限抗压强度试验。通过对比两种拌和方法所制备试样的干密度变化率和无侧限抗压强度的离散性,分析了拌和方法对试样强度产生的影响。结果表明:稀释拌和法所制备的改良黄土试样养护前后干密度变化更相近,同一掺量试样的干密度变化率离散程度均小于直接拌和法所制备试样;稀释拌和法与直接拌和法所制备试样均能反应改良黄土无侧限抗压强度受掺量影响的基本趋势,但稀释拌和法所制备试样的无侧限抗压强度试验结果更加稳定,能更好的反映出木质素纤维掺量变化对改良黄土试样强度的影响。To reduce the discreteness of lignin fiber-improved loess samples obtained in laboratory tests,unconfined compressive strength tests were carried out on the improved loess samples prepared by dilution mixing method and direct mixing method,respectively.By comparing the change rates of dry density and the discreteness of unconfined compressive strength of samples prepared by the two mixing methods,the effect of mixing methods on the strength of samples was analyzed.The results showed that the change of dry density of improved loess samples prepared by dilution mixing method is more stable before and after curing,and the dispersion degree of dry density change rate of samples with the same content is less than that of samples prepared by direct mixing method.The samples prepared by the two mixing methods can both reflect the basic trend that the unconfined compressive strength of improved loess is affected by the content.However,test results of unconfined compressive strength of the samples prepared by dilution mixing method are more stable,which can better reflect the effect of the change of lignin fiber content on the strength of improved loess samples.

关 键 词：木质素纤维 稀释拌和法 干密度 无侧限抗压强度 离散系数 

分 类 号：TU435[建筑科学—岩土工程]