冻结温度对植被混凝土生态基材冻胀特性的影响  

Influence of Freezing Temperature on Frost Heave Characteristics of Vegetation Growing Bases of Concrete

作　　者：周明涛[1] 胡欢[1] 杨平[1] 许文年[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《水土保持通报》2013年第4期253-256,共4页Bulletin of Soil and Water Conservation

基　　金：三峡大学博士启动基金"植被混凝土生态基材胀缩恢复性研究"(KJ2011B006);国家自然科学基金项目"植被混凝土生态防护基材微生物活性的变化机制与增强方法的研究"(51278281)

摘　　要：针对高寒气候条件下,因工程扰动造成的众多岩石裸露边坡亟待生态修复的现状,选取植被混凝土这一典型人造复合生态基材为研究对象,研究了冻结温度变化对其冻胀特性的影响。结果表明,植被混凝土作为弹塑性材料,在试验设定的负温环境中均将产生冻胀现象,其冻胀历时随冻结温度的升高逐渐增大,而冻胀率随冻结温度的降低呈极为显著的线性减小趋势;同一冻结温度条件与冻胀变形稳定时,在植被混凝土中将形成近似稳定的温度场,且试样中的温度降低幅度随着植被混凝土与冷源距离的增大逐步减弱;冻结温度场将明显改变水分在植被混凝土内的分布状况,冻结温度越低越不利于试样中水分的自由迁移。In the frigid area, the slope disturbed by the engineering projects was exposed with rocks, and needed ecological restoration urgently. Vegetation growing concrete chosen to be the typical compounded growing base material for the study to explore the influence of the freezing temperature on frost heave characteristics. The results show that as a elastic plastic material, all the vegetation growing concrete came up with frost heave under condition of given negative temperature, the development duration of frost heave increased with the rising of the freezing temperature while frost heave decreased slightly with the dropping of it. Under the same freezing temperature and the time of stable freezing, the approximate steady temperature field in the vegetation growing concrete was formed and the temperature drop gradually decreased with the increase of the distance between vegetation growing concrete and the nificantly altered the moisture distribution in the growing the less freely the moisture moved. source of coldness. Freezing temperature field sigbase of concrete where the lower the temperature,

关 键 词：冻结温度 植被混凝土 生态基材 冻胀 

分 类 号：P642.5[天文地球—工程地质学] U417.2[天文地球—地质矿产勘探]