沙坡头铁路防护体系阻沙效益风洞实验研究

利用野外风洞,对沙坡头铁路风沙防护体系各组成要素的阻沙率和流沙的输沙率进行了模拟实验研究.在同一风速下,分别测定了野外、风洞同一项目对应的风速梯度,确定了风洞实验数据与野外实测数据的转换系数,实现了数据转换.在此基础上,分析了防护体系各要素阻沙效益.以输沙率、阻沙率概念为基础,确立了风沙防护体系宽度计算公式.根据风洞实验转换数据,计算了不同风速下的防护宽度.研究结果对于我国荒漠区铁路、公路风沙防护体系的设计,具有一定的借鉴意义.

Sand-trapping Efficiency of Railway Protective System in Shapotou Tested by Wind Tunnel

The article makes use of wind tunnel to simulate the sand transmission ratio over shifting sand dune and the sand\|trapping ratio of various components of railway protective system in Shapotou. The wind speed gradients under same wind speed both in field and wind tunnel are respectively measured, so the conversion coefficient from test in wind tunnel to field is determined. The sand\|trapping efficiency of different components of rail protective system is analyzed. Based on the concepts of sand\|transmitting ratio and sand\|trapping ratio, the calculation expression for designing the protective system width is established. According to the transformation coefficient of wind tunnel test, the protective widths at different wind speeds are calculated. The result of research is used for reference to the design of protective systems of railway or highway in desert area.