反复施加拉剪组合力对小叶锦鸡儿直根材料力学特性的影响  

Effects of Repeated Combined Tension and Shear Forces on Mechanical Properties of Caragana microphylla Root Materials

作　　者：李瑞燊 刘静[1] 王博[2] 张欣[3] 胡晶华 苏慧敏 白潞翼 王多民 LI Ruishen;LIU Jing;WANG Bo;ZHANG Xin;HU jinghua;SU Huimin;BAI Luyi;WANG Duomin(Inner Mongolia Agricultural University,Hohhot 010019;The Inner Mongolia Autonomous Region Forestry Science Research Institute,Hohhot 010010;Institute of Water Resource for Pasturiy Area of the Ministry of Water Resources,Hohhot 010010;Alashan League Meteorological Bureau,Alashan League,Mongolia 737300)

机构地区：[1]内蒙古农业大学,呼和浩特010019 [2]内蒙古自治区林业科学研究院,呼和浩特010010 [3]水利部牧区水利科学研究所,呼和浩特010010 [4]内蒙古阿拉善盟气象局,内蒙古阿拉善盟737300

出　　处：《水土保持学报》2019年第5期121-125,共5页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(51364043);内蒙古科技计划项目(201802107)

摘　　要：以1~5 mm小叶锦鸡儿(Caragana microphylla)直根为研究对象,采用TY 8000伺服式强力机研究50次加载(荷载为试验根极限抗拉剪组合力的70%)对其材料力学特性的影响。结果表明:承受50次加载后,试验根极限力—径向位移曲线斜率大于对照根;试验根极限抗拉剪组合力及其强度显著高于对照根(p<0.05)。反复加载后试验根抗拉剪组合力—根径的函数关系、抗拉剪组合强度—根径的函数关系均与对照根相似,仍分别呈幂函数正相关、幂函数负相关。随着根径由1~2 mm增至4~5 mm,试验根极限抗拉剪组合力由对照根的1.26倍增至1.34倍。随着加载次数的增加,试验根径向位移增量减小。Taking the 1~5 mm straight roots of Caragana microphylla as the research object,the effects of 50 times of loading(70%of the ultimate tensile-shear combined force of the test roots)on the mechanical properties were studied using TY 8000 servo-type strength machine.The results showed that the slope of the ultimate force-radial displacement curve of the test roots was larger than that of the control after 50 times of loading,and the ultimate tensile-shear combined force and strength of the test roots were significantly higher than thsoe of the control roots(p<0.05).After repeated loading,both the function relationship between the combined tensile and shear forces and diameters and the function relationship between the combined tensile and shear strength and diameters of the test roots were similar to those of the control,but still showed a positive and a negative power function correlation,respectively.With the increase of root diameters from 1~2 mm to 4~5 mm,the ultimate tensile-shear combined force of test roots increased from 1.26 to 1.34 times of the control.With the increase of loading times,the increment of radial displacement of test root decreased.

关 键 词：小叶锦鸡儿 直根 拉剪组合力 反复加载 变形 

分 类 号：S157.2[农业科学—土壤学]