改性玄武岩残积土土-水特征曲线试验研究  

Experimental study on soil-water characteristic curves of modified basalt residual soil

作　　者：程学磊 张瑞敏 李岩[4] CHENG Xuelei;ZHANG Ruimin;LI Yan(School of Architectural and Civil Engineering,Zhongyuan University of Technology,Zhengzhou 450007,China;Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China;Engineering College,Zhengzhou Technology and Business University,Zhengzhou 451400,China;Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]中原工学院建筑工程学院,河南郑州450007 [2]黄河水利科学研究院,河南郑州450003 [3]郑州工商学院工学院,河南郑州451400 [4]天津城建大学天津市软土特性与工程环境重点实验室,天津300384

出　　处：《人民长江》2021年第9期203-208,共6页Yangtze River

基　　金：国家自然科学基金项目(41877251);天津市自然基金青年项目(16JCQNJC07700);中原工学院青年骨干教师计划资助项目(2020XQG14);中原工学院基本科研业务费专项资金项目(K2020QN015)。

摘　　要：为研究地下水对改性玄武岩残积土的影响,采用经过石灰、粉煤灰和水泥改性处理的两种不同配比及未处理土(对照组)进行土-水特征曲线试验,并对试验数据进行了数学模型拟合。研究结果表明:①土-水特征曲线由下降段和平缓段组成,下降段基质吸力对非饱和土的性质影响显著,平缓段影响不显著;②体积含水率随基质吸力的增大而逐渐减小,同时改性玄武岩残积土饱和度与基质吸力表现出相似变化特征,说明改性后的玄武岩残积土持水性良好;③Van Genuchten模型、Brooks-Corey模型和Fredlund-Xing模型与试验一致性较好,其中上述模型对改性土2来说模拟效果良好,改性土1次之,考虑到水稳性应优先选用改性土2。In order to study the influence of groundwater on the modified basalt residual soil,the soil-water characteristic curves of two different proportions soils treated with lime,fly ash and cement and the untreated soils(control group)were tested,and the experimental data were fitted.The results showed that:①The soil-water characteristic curve consisted of the descending section and the flat section.The matric suction in the descending section had a great influence on the properties of the unsaturated soil,but the matric suction in flat section had small influence.②The volumetric water content decreased gradually with the increase of matrix suction,and the saturation degree and matrix suction of modified basalt residual soil showed similar characteristics,which showed that the modified basalt soils had good water holding capacity.③The VG model,Brooks-Corey model and Fredlund-Xing model were in consistent with experimental results.Especially,these models had good fitting effect for modified soil 2,and had relatively worse fitting effect for modified soil 1.In consideration of water stability,modified soil 2 should be selected.

关 键 词：玄武岩残积土 土-水特征曲线 基质吸力 含水率 饱和度 

分 类 号：TU411[建筑科学—岩土工程]