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SOFT SOIL IMPROVEMENT INDUCED BY TREE ROOT SUCTION

机译：树木根吸引起的软土改良

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Bioengineering aspects of native vegetation are currently being evolved to improve soil stiffness, slope stabilisation, and erosion control. Tree roots provide three stabilising functions: (a) reinforcement of the soil, (b) dissipation of excess pore pressures and (c) establishing sufficient matric suction to increase the shear strength. The effects of vegetation on soil' matric suction, shrinkage and ground settlement are discussed in this paper. A mathematical model for the rate of root water uptake that considers ground conditions, type of vegetation and climatic parameters has been developed. A conical shape is considered to represent the geometry of the tree root zone. Based on this proposed model, the distribution of the moisture and the matric suction profile adjacent to the tree are numerically analysed. Field measurements taken from literature published previously are compared with the authors' numerical model. The predicted results, calculated based on soil, plant, and atmospheric parameters contained in the numerical model, compared favourably with the measured results, justifying the assumptions upon which the model has been developed. The findings of this study indicate that due to significant changes in soil moisture content induced by tree roots, the shear strength of the soil will be enhanced. It is desirable to consider the influence zone of tree roots and the improved soil properties in modern geotechnical designs, benefiting from native vegetation.
机译：当前正在开发原生植被的生物工程学方面，以改善土壤硬度，稳定边坡和控制侵蚀。树根提供三种稳定功能：（a）加固土壤，（b）消除多余的孔隙压力，（c）建立足够的基质吸力以增加剪切强度。本文讨论了植被对土壤基质吸力，收缩和地面沉降的影响。已经建立了考虑地面条件，植被类型和气候参数的根系吸水率数学模型。圆锥形被认为代表了树根区域的几何形状。基于该提出的模型，对与树木相邻的水分分布和基质吸力分布进行了数值分析。从先前发表的文献中获得的野外测量结果与作者的数值模型进行了比较。根据数值模型中包含的土壤，植物和大气参数计算得出的预测结果与测量结果相比具有优势，证明了模型开发所依据的假设是正确的。这项研究的结果表明，由于树根引起的土壤含水量的显着变化，土壤的抗剪强度将得到增强。希望在现代岩土设计中考虑到树根的影响区和改良的土壤特性，这些都得益于原生植被。

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