摘要
以神府-东胜煤田采煤塌陷区常见固土植物小叶锦鸡儿和北沙柳为研究对象,采用TY8000伺服控制试验机测定其1~4 mm根径范围内分叉处根段抗拉强度、延伸率等,研究此根段承受反复拉伸后的力学特性。结果表明:2种灌木分叉处根段的极限抗拉强度与根径呈负相关关系,极限抗拉力与根径呈正相关关系;小叶锦鸡儿的平均极限抗拉强度(25.91±5.95 MPa)显著大于北沙柳的平均极限抗拉强度(14.83±2.60 MPa)。2种灌木分叉处根段在受反复拉伸时的力-位移曲线均表现出弹塑性特征;北沙柳的平均延伸率(21.84%±3.09%)、平均弹性应变(3.37±0.54)均显著大于小叶锦鸡儿的平均延伸率(19.37%±2.82%)、平均弹性应变(2.12±0.52)。本研究可充实灌木根系的固土力学机制,同时为北方采煤塌陷区植被恢复建设的物种选择提供一定的理论依据。
Taking Caragana microphylla and Salix psammophila,common soil-fixing plants in the coal mining subsidence area of Shenfu-Dongsheng Coalfield,as the research objects,the tensile strength and elongation of root segment at the bifurcation with diameter class between 1 mm and 4 mm were measured by TY8000 servo control testing machine,and the mechanical properties of this root segment after repeated stretching were studied.The results show that there is a negative correlation between ultimate tensile strength and root diameter at the bifurcation of two shrubs,and a positive correlation between ultimate tensile strength and root diameter.The average ultimate tensile strength of Caragana microphylla(25.91±5.95 MPa)is significantly higher than that of Salix psammophila(14.83±2.6 MPa).The force-displacement curves of the root section at the bifurcation of the two shrubs show elastic-plastic characteristics after repeated stretching.The average elongation(21.84%±3.09%)and average elastic strain(3.37±0.54)of Salix psammophila were significantly higher than those of Caragana microphylla(19.37%±2.82%)and(2.12±0.52).This study can enrich the mechanical mechanism of soil consolidation of shrub roots,and provide a theoretical basis for selection of plant species in vegetation restoration and construction in northern coal mining subsidence areas.
作者
兰鹏波
刘静
苏慧敏
王成龙
白潞翼
胡晶华
袁亚楠
LAN Peng-bo;LIU Jing;SU Hui-min;WANG Cheng-long;BAI Lu-yi;HU Jing-hua;YUAN Ya-nan(College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010011,China)
出处
《内蒙古林业科技》
2021年第1期13-18,38,共7页
Journal of Inner Mongolia Forestry Science and Technology
基金
内蒙古自治区自然科学基金项目“几种灌木根系易损荷载类型、及承受可愈伤荷载时和自修复后的材料力学特性”(2018MS05004)。
关键词
灌木
分叉处根段
抗拉强度
延伸率
采煤塌陷区
shrub
root section at bifurcation
tensile strength
elongation rate
coal mining subsidence area
作者简介
兰鹏波(1996—),男,内蒙古乌兰察布人,硕士研究生,研究方向:水土保持与荒漠化防治。E-mail:1018997575@qq.com;通讯作者:刘静(1958—),女,内蒙古呼和浩特人,教授,博士生导师,研究方向:水土保持与荒漠化防治。E-mail:ljing58@126.com。
