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护底布置在紧靠岸坡堤脚的滩面,是护岸的延续,可减轻冲刷深度,且能填补冲坑,以免堤脚基础沉降危及堤防安全。在设计中,根据河道设防标准不同,护底宽度常按经验数字确定,为冲刷深度的1.5～2倍或河底宽度的1/10～1/5,常取10～20 m,没有进行量化,容易造成防护体设置的不当,防护体不足则影响工程安全,过量则造成投资加大。根据《堤防工程设计规范》(GB50286-98)及《堤防工程手册》归纳总结堤脚护底的宽度计算方法,并用伊士巴许公式对石笼体重量、抗滑及抗悬浮所需厚度进行复核,结合工程实例,对结论进行评价。
Arranged on the beach near the foot of bank slope, the protection bottom is a continuation of revetment. It can reduce the scouring depth and can fill the scouring pit, so as to avoid embankment footing and endanger the embankment safety. In the design, according to the different standards of river fortification, the width of the bottom is usually determined empirically, which is 1.5 to 2 times of the erosion depth or 1/10 to 1/5 of the width of the river bottom, usually 10 to 20 m, and is not quantified , Likely to cause the protective body is not set properly, lack of protective body will affect the safety of the project, resulting in increased investment overdose. According to “Design Code for Dyke Engineering” (GB50286-98) and “Dike Engineering Manual”, the calculation method of width of embankment footing is summarized and the weight of stone cage, the thickness required for anti-skid and anti-levitation Review, combined with engineering examples, to evaluate the conclusions.