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首页> 外文期刊>Journal of terramechanics >Changes in some mechanical properties of a loamy soil under the influence of mechanized forest exploitation in a beech forest of central Belgium
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Changes in some mechanical properties of a loamy soil under the influence of mechanized forest exploitation in a beech forest of central Belgium

机译：比利时中部山毛榉林机械化开采对壤土土壤某些力学性质的影响

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摘要

Modification of some soil mechanical properties (penetration resistance and consolidation pressure) induced by vehicle compaction during mechanized forest exploitation was studied in an acid and loamy leached forest soil of the loessic belt of central Belgium. In situ penetration tests and laboratory Bishop-Wesley cell tests were undertaken for the two main soil horizons of a beech high-forest, i.e. the eluvial E horizon (5-30 cm depth) and the underlying clay-enriched B_t horizon (30-60 cm depth). Both undisturbed and wheel-rutted soil areas were studied (E and B_t horizons vs. E_g and B_(tg) horizons). Results show that: The experimental overconsolidation pressure of the eluvial reference horizon (E) is about 50 kPa higher than the value calculated from soil overburden pressure; this probably results from suction action during dry periods. The clay-enriched reference horizon (B_t) shows the same trends. In wheel-rutted areas, seven years after logging operations, the E_g horizon memorizes only 14.5% of the wheel induced stress due to forest machinery. In the compacted B_(tg) horizon, the experimental overconsolidation pressure represents 96% of the exerted theoretical stresses due to harvesting actions. The good recording of the exerted stresses, after seven years, can be explained by: (1) The B_(tg) depth which keeps it from seasonal variations i.e. from desiccation-moistening or freeze-thaw cycling; (2) amorphous and free iron accumulation inducing a "glue" effect of the B_(tg) soil matrix, which could stabilize the soil structure and prevent recovery to initial conditions. These results provide clear evidence that on loessic materials, soil compaction due to togging operations leads to modifications in both physical (bulk density, total porosity) and mechanical (penetration resistance and consolidation pressure) soil properties.
机译：在比利时中部黄土带的酸性和肥沃淋溶森林土壤中，研究了机械化森林开采过程中车辆压实引起的某些土壤力学性质（抗渗透性和固结压力）的变化。对山毛榉高林的两个主要土壤层进行了原位渗透测试和实验室的Bishop-Wesley细胞测试，即坡向E层（5-30 cm深度）和下层富含粘土的B_t层（30-60）厘米深）。研究了未扰动和车轮车轮痕迹的土壤区域（E和B_t水平线与E_g和B_（tg）水平线）。结果表明：海拔参考层（E）的实验超固结压力比土壤上覆压力计算的值高约50 kPa。这可能是由于干燥期间的吸气作用引起的。富含粘土的参考层（B_t）显示出相同的趋势。在采伐作业后七年的轮辙地区，E_g地平线仅记录了由于林业机械引起的轮缘应力的14.5％。在压实的B_（tg）层中，实验的超固结压力代表了由于收获作用而施加的理论应力的96％。七年后施加的应力的良好记录可以解释为：（1）B_（tg）深度，使其不受季节变化（即，干燥湿润或冻融循环）的影响； （2）非晶态和游离铁的积累引起B_（tg）土壤基质的“胶水”效应，这可以稳定土壤结构并阻止恢复到初始状态。这些结果提供了明确的证据，表明在黄土材料上，由于拖曳操作造成的土壤致密性会导致土壤物理性质（堆积密度，总孔隙率）和机械性质（抗渗透性和固结压力）发生变化。

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