兰新高速铁路风沙区段挡沙墙设计参数试验研究

兰新二线风沙路基主要集中于烟墩风区及百里风区,大风条件下极易形成风沙流,挡沙墙是解决风沙对铁路危害的主要措施。为充分发挥挡沙墙的防风沙作用,针对兰新高速铁路沿线风沙流成因及规律进行分析,对挡沙墙高宽比、孔隙率和高度3个参数分别进行对比试验,提出适合该地区铁路防沙的挡沙墙优化设计思路。结果表明:当挡沙墙高度一定时,风沙防护效果与挡沙墙的宽度显现出一定的负相关变化;对于均匀结构的网状沙障来说,孔隙率为40%的防沙效果最优,30%的次之,50%的相对最差;从不同高度挡沙墙的风沙防护效果来看,高度为2.0 m的挡沙墙的风沙防护效果相对较好,高度为2.5 m和1.5 m挡沙墙防沙效果略差。

Experimental Study on Design Parameters of Retaining Wall for Sandstorm Section of Lanzhou- Urumqi High-speed Railway

The sand roadbed is mainly located in Yandun wind zone and Barry wind zone along double track Lanzhou- Xinjiang railway line. Sand flow is likely to form under strong wind condition. The sand retaining wall plays an important role in the protection of railway. In order to give full play of the sand retaining wall,this paper addresses the causes and regularities of sand flow along the Lanzhou- Urumqi high-speed railway,and the parameters of the sand retaining wall in terms of height and width ratio,porosity and height are compared and tested,finally the optimization design method of sand retaining wall is put forward. The analysis results show that when the sand retaining wall is of a certain height,the protective effect of the sand retaining wall shows a negative correlation with the width. For sand barrier of unified web structure,the porosity of 40% is the best,followed 30% and 50%. The sand retaining wall of 2 m high is recommended followed by 2. 5 m and 1. 5 m.