根-土复合体抗剪强度影响因素研究  

Study on the influencing factors of shear strength of root-soil composite

作　　者：陈攀 葛永刚[1,2] 孙庆敏 孙聿卿 张永波 CHEN Pan;GE Yonggang;SUN Qingmin;SUN Yuqing;ZHANG Yongbo(Institute of Mountain Hazards and Environment,CAS,610041 Chengdu,China;Key Laboratory of Mountain Surface Process and Hazard,Chinese Academy of Sciences,610041 Chengdu,China;Engineering College,Tibet University,850000 Lhasa,China;University of Chinese Academy of Sciences,100049 Beijing,China)

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所,成都610041 [2]中国科学院山地灾害与地表过程重点实验室,成都610041 [3]西藏大学工学院,拉萨850000 [4]中国科学院大学,北京100049

出　　处：《应用力学学报》2024年第4期804-811,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金重点项目(No.41790432);中国科学院战略性先导科技专项(No.XDA23090203)。

摘　　要：为比较根-土复合体组分及法向应力对其抗剪强度的影响程度,选取四川省喜德县冕山镇坡面(安宁河流域砾砂区)云南松根-土复合体和素土作为研究对象,通过室内直剪试验获得其抗剪强度,烘干试验获得各组分质量,利用根-土复合体的干土质量、水质量和干根质量进行Pearson相关分析,构建回归分析模型计算根-土复合体各组分质量与抗剪强度的标准化回归系数。结果表明:根-土复合体的干土质量与干根质量间存在显著负相关关系(P=0.002<0.01,r=-0.792),根-土复合体中水质量与干土质量和干根质量之间均无显著相关关系(P>0.05);云南松根-土复合体中干土质量、干根质量和水的质量与抗剪强度的标准化回归系数分别为0.06、0.03和0.03,表明干土质量对根-土复合体抗剪强度的影响程度较水的质量和干根质量的影响程度大;与素土的内摩擦角和黏聚力相比,云南松根-土复合体的内摩擦角增加了1.31%~1.97%,黏聚力增加了16.71%~34.74%。In order to compare the effect of component of root-soil composite and normal stress on the shear strength of the root-soil composite.The root-soil composite for Pinus yunnanensis and the non-rooted soil,located on the slope(gravel sand areas of Anning River)of Mianshan Town in Xide County of Sichuan Province,were selected as the objects of study.Direct shear test and drying test were conducted.Pearson correlation analysis was conducted to seek the relationship of mass between dry soil,water and dry root in the root-soil composite.The regression analysis model between mass of components of the root-soil composite and the shear strength was established to calculate the standardized regression coefficients.The results showed that:in the root-soil composite for Pinus yunnanensis,mass of dry soil was significantly and negatively correlated with mass of dry root(P=0.002<0.01,r=-0.792),and mass of water was no significantly correlated with mass of dry root or dry soil(P>0.05).The standardized regression coefficients of dry soil mass,dry root mass and water mass with shear strength of the root-soil composite were 0.06,0.03 and 0.03,respectively.It indicated that the effect of dry soil mass on the shear strength was greater than that of water mass and dry root mass.The internal friction angle and the cohesion of the root-soil composite for Pinus yunnanensis increased by 1.31%-1.97%and 16.71%-34.74%compared with the non-rooted soil,respectively.

关 键 词：砾砂 根-土复合体 抗剪强度 相关分析 组分质量 

分 类 号：TU4[建筑科学—土工工程]