| 贺兰山3种乔木单根及根土复合体力学特性 |
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| 引用本文： | 田佳,卞莹莹,于江珊,王晓燕,许玲玲.贺兰山3种乔木单根及根土复合体力学特性[J].水土保持学报,2018,32(6):123-129. |
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| 作者姓名： | 田佳 卞莹莹 于江珊 王晓燕 许玲玲 |
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| 作者单位： | 宁夏大学农学院, 银川 750021 |
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| 基金项目： | 国家自然科学基金项目（31560232） |
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| 摘 要： | 为研究和比较贺兰山山杨、青海云杉、油松单根和根土复合体的力学特性,通过单根拉伸、三轴压缩、饱和渗透试验测定了3种乔木单根和根土复合体的力学参数及土水特征曲线。结果表明:3种乔木单根力学特性存在显著差异,且直径对单根的力学特性有显著影响。单根最大拉力与直径成幂函数相关,随直径增大而增大;单根抗拉强度、杨氏模量与直径成对数函数相关,随直径增大而减小。山杨单根平均最大拉力(0.38kN)青海云杉(0.25kN)油松(0.17kN);山杨单根平均抗拉强度(33.39 MPa)青海云杉(27.79MPa)油松(18.45MPa);山杨单根平均杨氏模量(0.17GPa)青海云杉(0.12GPa)油松(0.11GPa)。3种乔木根土复合体的黏聚力、弹性模量存在显著差异,但摩擦角没有显著差异(平均值30.48°)。山杨根土复合体的黏聚力(10.65kPa)青海云杉(8.97kPa)油松(7.13kPa);山杨根土复合体的弹性模量(2.17 MPa)青海云杉(2.52 MPa)油松(4.21 MPa)。3种乔木根土复合体的土水特征曲线、渗透函数曲线都存在极显著差异,山杨根土复合体的渗透能力油松青海云杉。研究结果对于评价山杨、青海云杉、油松稳定边坡能力和建立贺兰山边坡稳定性分析数值模型都具有重要参考价值。
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| 关 键 词： | 根土复合体 单根 根的抗拉强度 根系固土 贺兰山 |
| 收稿时间： | 2018/6/15 0:00:00 |
Mechanical Properties Comparison of Single Root and Root-soil Composite of Three Arbor Species in Helan Mountain |
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| TIAN Ji,BIAN Yingying,YU Jiangshan,WANG Xiaoyan,XU Lingling.Mechanical Properties Comparison of Single Root and Root-soil Composite of Three Arbor Species in Helan Mountain[J].Journal of Soil and Water Conservation,2018,32(6):123-129. |
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| Authors: | TIAN Ji BIAN Yingying YU Jiangshan WANG Xiaoyan XU Lingling |
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| Institution: | School of Agriculture, Ningxia University, Yinchuan 750021 |
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| Abstract: | In order to study and compare the mechanical properties of the single root and root-soil composite of Populus davidiana, Picea crassifolia, and Pinus tabuliformis, the single root tensile test, the triaxial compression test, and the saturated permeability test were used to get the mechanical properties and the soil-water characteristic curves of the three arbors. The results showed that there were significant differences in the mechanical properties of the single root of the three arbors, and the diameter had a significant effect on the mechanical properties of the single root. The maximum tensile force of the single root was correlated to the power function of diameter and increased with the increasing of diameter, while the tensile strength and the Young''s modulus of single root were correlated with the logarithmic function of diameter and decreased with the increasing of diameter. The average of maximum tensile force of the single root of P. davidiana was 0.38 kN > P. crassifolia (0.25 kN) > P. tabuliformis (0.17 kN), the average of tensile strength of P. davidiana (33.39 MPa) > P. crassifolia (27.79 MPa) > P. tabuliformis (18.45 MPa), the average of Young''s modulus of P. davidiana (0.17 GPa) > P. crassifolia (0.12 GPa) > P. tabuliformis (0.11 GPa). There were significant differences in the cohesion and the elastic modulus of the three arbors root-soil composite, but there was no significant difference in the friction angle (the mean value was 30.48°). The cohesion of root-soil composite of P. davidiana (10.65 kPa) > P. crassifolia (8.97 kPa) > P. tabuliformis (7.13 kPa), the elastic modulus of P. davidiana (2.17 MPa) < P. crassifolia (2.52 MPa) < P. tabuliformis (4.21 MPa). The soil-water characteristic curves (SWCC) and the permeability function curves of the root-soil composite of the three arbors were significantly different. The permeability of root-soil composite of P. davidiana was higher than that of P. tabulaeformis and P. crassifolia. The result is an important reference for evaluating the ability of the three arbors to stabilize the slope and establishing the numerical model of the slope stability analysis for Helan Mountain. |
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| Keywords: | root-soil composite single root root tensile strength root reinforcement Helan Mountain |
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