泥沙淤积对公路黄土坝式路堤的影响研究

为了研究泥沙淤积对公路黄土坝式路堤的影响,根据坝式路堤实际情况,考虑泥沙危害和来源,综合考虑水域面积内及分水岭内降雨径流的入库量,得出径流深及最终年入库量,由此得出坡面产沙量。工程实例计算结果表明:由于没有径流,泥沙主要来源是降雨引起的侵蚀跟随地上径流而流进库区;分析了三种泥沙淤积对坝式路堤影响的情况,根据入库量计算出产沙量,得到每年入库的泥沙体积,并计算出泥沙淤积总量及有效库容;经过若干年的泥沙淤积,库区的有效库容仅剩设计库容的20%左右。

Effects of Sediment Deposition on the Loess Dam Embankment of Highway

In order to study the effects of sediment deposition on the loess dam embankment ,according to the actual situ-ation of dam type embankment ,the hazards ,sources of sediment ,the amount of rainfall and the watershed ,the runoff depth and the final annual storage volume are calculated in this paper ,based on which the sediment yield was obtained . The results of engineering examples show that without runoff ,the main source of sediment is the erosion caused by rainfall following the runoff and flow into the reservoir area ;the influence of three kinds of sediment deposition on dam type em-bankment is analyzed .By calculating the amount of sediment based on the amount of storage ,the volume of sediment per year was derived ,and the total amount of sediment deposition and effective storage capacity are also calculated .The re-sults show that after several years of sediment deposition ,the effective storage capacity of the reservoir area was only about 20% of the design capacity .