边坡冲刷中防护土工布绳索的有效性研究

Study on the Effectiveness of Protective Geotextile Rope in Slope Scouring

近年来,在大西海子水库下游的废弃砾石坑中应用了粗放钢丝绳进行边坡侵蚀防护。防护区段坡面一般无细沟、沟渠。为分析绳索防蚀效果的有效性,在有绳和无绳两种情况下,分别计算绳索护坡的实际年平均土壤侵蚀率E_(A)和潜在年平均土壤侵蚀率E_(p)。根据17年的降雨记录、土壤性质、坡面几何参数、种植和管理实践以及现场的侵蚀控制实践确定了USLE的参数值。在绳坡段计算得到的E_(A)=0.383 t/(hm^(2)·a)表明,绳坡段目前几乎无侵蚀。无绳边坡的E_(A)=8.443 t/(hm^(2)·a)表明该边坡目前存在中等强度的侵蚀。无绳坡段E_(p)的值为38.376t/(hm^(2)·a),也表明该坡段未来将会有较强的侵蚀。

In recent years,this kind of extensive steel wire rope has been applied in the abandoned gravel pit downstream of Daxi Haizi Reservoir for slope erosion protection.There are generally no rills and ditches on the slope of the protection section.In order to analyze the effectiveness of the anti-corrosion effect of the rope,the actual annual average soil erosion rate fA and the potential annual average soil erosion rate EP of the rope slope protection were calculated respectively in the two cases with and without rope.USLE parameter values were determined based on 17 years of rainfall records,soil properties,slope geometry,planting and management practices,and erosion control practices in the field.The calculated E_(A)=0.383t/(hm^(2)·a)in the rope slope section shows that there is almost no erosion in the rope slope section at present.The E_(A)=8.443 t/(hm^(2)·a)of the cordless slope indicates that the slope is currently experiencing moderate erosion.The EP value of the ropeless slope section is 38.376 t/(hm^(2)·a),which also indicates that this slope section will have strong erosion in the future.