Hydro-mechanical reinforcement of contrasting woody species: a full-scale investigation of a field slope
Hydro-mechanical reinforcement of contrasting woody species: a full-scale investigation of a field slope
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DOI：
10.1680/jgeot.19.sip.018
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发表时间：
2021-11-01
期刊：
影响因子：
5.8
通讯作者：
Bengough, Anthony Glyn
中科院分区：
文献类型：
--
作者：
Boldrin, David;Leung, Anthony K.;Bengough, Anthony Glyn
利用植被进行土壤生物工程是一种环境友好的边坡加固技术。植物通过机械加固（通过根系锚固）和水文加固（通过蒸腾引起的基质吸力）来稳定斜坡。然而，很少有人知道植物的功能组对边坡水文和稳定的影响。这使得工程师很难选择合适的土壤生物工程物种。在这项研究中，全尺寸的现场监测20米长的植被路堤进行，目的是量化和比较三个对比的木本物种（落叶榛avellana，万年青冬青冬青和万年青欧洲冬青）原产于欧洲温带气候提供的水力机械加固。在两个生长季内测定了降雨截留量、基质吸力和原位土壤强度。万年青树种的吸水量差异很大，有时超过落叶树种。美国万年青树。欧洲的诱导最大的吸力（> 70千帕）和土壤剪切强度（例如高达136千帕），因为其更好地发展地上枝结构的降雨拦截（高达50%的降雨量）和更大的根长密度吸水。这表明，仔细选择的物种可以大大提高土壤抗剪强度，提高边坡稳定。
Soil bioengineering using vegetation is an environmentally friendly technique for slope stabilisation. Plants stabilise slopes by way of mechanical reinforcement (through root anchorage) and hydrological reinforcement (through transpiration-induced matric suction). However, little is known about the effects of a plant's functional group on slope hydrology and stabilisation. This makes it difficult for engineers to select appropriate species for soil bioengineering. In this study, full-scale field monitoring of a 20 m long vegetated embankment was conducted, with the aim to quantify and compare the hydro-mechanical reinforcement provided by three contrasting woody species (deciduous Corylus avellana, evergreen Ilex aquifolium and evergreen Ulex europaeus) native to a European temperate climate. The rainfall interception, matric suction and in situ soil strength were measured over two growing seasons. Evergreen species differed greatly in their water uptake, and sometimes exceeded the deciduous species. The evergreen U. europaeus induced the greatest suction (> 70 kPa) and soil shear strength (e.g. up to 136 kPa) because of its better developed above-ground shoot architecture for rainfall interception (up to 50% of incoming rainfall) and greater root length density for water uptake. This suggests that careful choice of species could greatly enhance slope stabilisation by increasing the soil shear strength.