植被混凝土生态护坡基材初期强度特性研究  

Research on characteristics of early strength of ecological slope-protected base material of vegetation-growing concrete

作　　者：夏振尧[1,2] 许文年[1] 王乐华[1] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]武汉大学水利水电学院,武汉430079

出　　处：《岩土力学》2011年第6期1719-1724,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50879043;No.50909052);国家科技支撑计划项目资助(No.2006BAC10B04)

摘　　要：生态护坡基材初期强度对基材在边坡的自身稳定和物种发芽有重要影响。以植被混凝土基材为研究对象,以其2 d龄期的无侧限抗压强度作为初期强度的代表值,对生态护坡基材初期强度特征进行研究。以水泥掺量αw、有机质掺量αOM和水灰比w/c为影响因素,分别设计单因素影响试验、正交试验。试验数据分析表明,水泥掺量、有机质掺量和水灰比3因素均对植被混凝土初期强度产生影响,影响程度依次为αw>αOM>w/c;w/c在0.50～0.55之间时植被混凝土基材初期强度最大。在水灰比及其他因素不变的条件下,以αw、αOM为自变量,建立了植被混凝土基材初期强度的多元非线性回归模型,验证试验表明该模型可较准确地预测植被混凝土基材的初期强度。在植被混凝土生态防护技术应用过程中,根据基材初期强度模型估计基材最小水泥掺量和最大有机质掺量,既可保证工程实施初期基材的自身稳定性,又有利于边坡后期植被的恢复和持久生长。The early strength of ecological slope-protected base material has an important influence on stability of base material onto slope and seed germination.Taking the unconfined compressive strength at 2 days of vegetation-growing concrete base material（VCBM） as research object,the characteristics of early strength of ecological slope-protected base material are studied.Through single factor affecting tests and orthogonal tests,which take cement dosage,organic matter dosage and water-cement ratio as influence factor,the analysis of tests data indicate： the three factors all affect the early strength of VCBM;and the degree follows by： cement dosage organic matter dosage water-cement ratio.When water-cement ratio is between 0.50 and 0.55,the early strength of VCBM reaches a maximum value.Regarding Cement dosage and organic matter dosage as independent variables on condition that water-cement ratio and other factors are constant,a multiple nonlinear regression model on the early strength of VCBM is established.And the confirmatory tests testify that the model could predict the early strength of VCBM approximately.According the model to estimating the minimum cement dosage and maximum organic matter dosage in course of the application of VCBM ecological slope-protected technology,it can ensure the stability of base material during early stage of implementation as well as propitious to vegetation recovery and sustained growth on slope in late stage.

关 键 词：植被混凝土基材 初期强度 影响因素 正交试验 回归模型 

分 类 号：TU443[建筑科学—岩土工程]