重塑粗粒土-黏性土混合物冲刷特性研究  

Study on the erodibility of reconstituted cohesive and non-cohesive soil mixtures

作　　者：高晓静 王秋生[2] 李勇[3] 邹福林 GAO Xiaojing;WANG Qiusheng;LI Yong;ZOU Fulin(Bridge and Tunnel Research Center,Research Institute of Highway Ministry of Transport,Beijing 100088,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;China Railway 11 Bureau Group Co.,LTD.,Wuhan 430061,China)

机构地区：[1]交通运输部公路科学研究院桥梁隧道研究中心,北京100088 [2]北京工业大学建筑工程学院,北京100124 [3]中铁十一局集团有限公司,湖北武汉430061

出　　处：《水利学报》2021年第3期323-332,共10页Journal of Hydraulic Engineering

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(2020-9032);国家自然科学基金项目(51679003,51538001);交通运输部公路科学研究所(院)科技创新专项资金项目(2019-C505);山西省交通科技项目(2017-1-6)。

摘　　要：针对粗粒土-黏性土混合物的冲刷特性与无黏性土、黏性土的不同,采用冲刷函数测定仪对三种重塑粗粒土-粉质黏土混合物进行了冲刷特性试验研究,分析了不同粉质黏土含量情况下三种混合土体冲刷速率和起动切应力的变化规律,根据冲刷速率和起动切应力的取值确定了三种混合土体临界黏性颗粒含量的范围。随黏性颗粒含量的增加混合土体的冲刷行为逐渐由无黏性变为黏性,基于这一特点,提出冲刷黏性度的概念,作为衡量混合土体是否具有黏性冲刷行为的度量,考虑无黏性颗粒粒径和黏粒含量对混合土体冲刷特性的影响,给出冲刷黏性度表达式,根据本文冲刷试验数据确定了表达式参数的取值,通过已有其他试验数据,验证了冲刷黏性度表达式的合理性和准确性。The erodibility of cohesive and non-cohesive soil mixtures is different from that of cohesive soils and non-cohesive soils.In this paper,erosion tests were conducted to investigate the erodibility of three different non-cohesive soil and silty clay mixtures using an erosion function apparatus.The variations of mixtures’erosion rate and critical shear stress were analyzed according to the experimental data.The critical mud content of the three mixtures were obtained by analyzing the data of erosion rate and critical shear stress.Erosion experiments have clearly demonstrated that the erosion characteristics of mixtures can change dramatically when the mud content changes.Considering the variation of mixture erosion behavior,the concept of degree of cohesive erosion behavior were proposed for cohesive and non-cohesive soil mixtures,which can be used to estimate if the mixture exhibits cohesive erosion behavior.A formula was developed for the degree of cohesive erosion behavior for mixtures.The formula was expressed as a function of the grain size of non-cohesive coarse particles and cohesive soil,and clay content.The final form of the developed formula was tested using the experimental data from the present study and the literature.

关 键 词：冲刷 混合土体 起动切应力 临界黏性颗粒含量 黏粒含量 冲刷黏性度 

分 类 号：TU442[建筑科学—岩土工程]