植物根系固土作用模型研究进展

Research Progress of Root Reinforcement Models

植物根系固土作用模型研究已历经近40年,从简单的极限平衡模型到复杂的有限元和离散元数值模型,已发展到10余种。总结这些根系固土作用模型不仅对揭示根系加固土壤作用的力学机制和分析林地边坡的稳定性具有重要意义,对根系固土作用模型未来的研究方向也具有积极指导意义。笔者对根系固土作用模型分2部分进行综述,第一部分主要介绍根系固土作用的理论模型,包括:Wu模型、倾斜根系模型、位移模型、纤维束模型、根束增强模型和能量模型,以及这些模型的应用条件、模型优缺点、适用范围等。第二部分主要综述根系固土作用的数值模型,包括:有限元数值模型、离散元数值模型和造林边坡稳定性分析数值模型,并详细比较了有限元与离散元数值模型的优缺点和在造林边坡稳定性分析上的应用。最后探讨了目前根系固土作用模型研究中存在的不足以及未来的发展方向。

Studies on the models of root reinforcement have a history for about 40 years. From the simplelimiting equilibrium model to the complex finite element model（FEM） and discrete element model（DEM）models, more than 10 types of models of root reinforcement were developed. To summarize these models of rootreinforcement, not only is important for revealing the mechanism of soil reinforcement by plant roots andanalyzing the stability of forested slope, but also provides a scientific guide for the future research on rootreinforcement models. In this study, the root reinforcement models were summarized from two parts. The firstpart mainly introduced theoretical models, including Wu＇s model, inclined root reinforcement model,displacement-based model, fiber bundle model, root bundle model and energy approach model, as well as thepreconditions, advantages, disadvantages and the applications of the models. The second part mainlyintroduced numerical models of root reinforcement, including the finite element model（FEM）, discrete elementmodel（DEM） and the numerical model of forested slope stability analysis. The advantages and disadvantages ofFEM and DEM models and the applications of FEM and DEM models to analyzing the stability of forestedslope were compared in detail. Finally, the shortages of the current research on root reinforcement models werediscussed and the direction of future development of root reinforcement models was predicted.