根系参数对根土复合体抗剪力学特性的影响  

Influence of Root Paramenters to the Shear Resistance of Soil⁃Root Composite

作　　者：罗露瑶 宋路[1] 朱海丽[1] 李本锋 张珂 刘亚斌 李国荣[1] 张玉 LUO Luyao;SONG Lu;ZHU Haili;LI Benfeng;ZHANG Ke;LIU Yabin;LI Guorong;ZHANG Yu(Department of Geological Engineering,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学地质工程系,青海西宁810016

出　　处：《人民黄河》2020年第10期42-46,共5页Yellow River

基　　金：国家自然科学基金资助项目(41762023)。

摘　　要：河岸带土体的抗剪力学特性是评判河岸稳定的关键因素。为了研究黄河源区河岸带的根系参数对土体抗剪力学特性的影响,以华扁穗草为试验材料,通过开展不同根长和含根量的重塑根-土复合体直剪试验,分析根长和含根量对抗剪强度指标的影响。试验结果表明:植被根系能够显著提高土体的抗剪强度,当含根量从3%增至24%时,根长为2、4、6 cm的根-土复合体分别在含根量为15%、18%和21%时达到抗剪强度峰值,分别为23.78、21.44、21.75 kPa;根土复合体的黏聚力值较素土分别增加了19.2、16.9、17.2 kPa;根-土复合体内摩擦角的最大值对应的含根量分别为15%、12%和15%;当根-土复合体中含根量小于9%时,根长越长,根系增强土体黏聚力的效应越强。The shearing mechanical properties of the riparian soil are the key factors for evaluating the bank stability.In order to investigate the influencing of root parameters to the shear behavior of the soil⁃root composite in the riverbank in the source region of the Yellow River,the direct remolding shear test was carried out and took Blysmus sinocompressus as the experimental material.Different root lengths and root contents were designed to analyze the influence of root length and root content to the shear strength index.The results show that the root sys⁃tem can significantly improve the shear strength of soil.When the root content is increased from 3%to 24%,the root⁃soil composite with root length of 2,4 and 6 cm reaches the shear peak at the root content of 15%,18%and 21%respectively,and the shear peak is 23.78,21.44 and 21.75 kPa.Comparing with pure soil,the cohesion of root⁃soil composite is increased by 19.2,16.9 and 17.2 kPa respectively.When the root length is 2,4 and 6 cm,the maximum value of the Angle of internal friction is 15%,12%and 15%respectively.When the root content in the root⁃soil complex is less than 9%,the longer the root length,the stronger the effect of the root to enhance the cohesion of the soil.

关 键 词：河岸 根-土复合体 含根量 根长 重塑直剪试验 黄河源区 

分 类 号：TV861[水利工程—水利水电工程] TV882.1