青藏铁路西格段戈壁风沙流防治体系研究

青藏铁路西宁至格尔木段(西格段)日照冻融变化强烈、风力强劲，为了解决该环境下戈壁风沙流对路基的危害，以PE(polythene)固沙网为平面防治并结合高立式沙障为立面防治措施，组成了戈壁风沙流防治体系，通过现场观测及室内风洞实验，验证了该防治体系的防风固沙效果和工程可靠性。工程应用表明，该防治体系具有抗风蚀性能强、可重复利用、寿命长及绿色环保等特点，能够有效防治铁路戈壁风沙流的危害，并对养护工作量的减少起到了重要作用，可以替代传统石方格、竹栅栏等防风固沙措施。对类似于西格段这种戈壁风沙流速较大、海拔高、生态脆弱、传统防沙材料贫乏和工程防沙措施失效的地区，新型防治体系具有借鉴和示范作用。

Wind-blown Sand Prevention System at Gobi Desert Area along Xining-Golmud Section of Qinghai-Tibet Railway

In order to prevent the wind-blown sand damage on subgrade engineering in Xining-Golmud section of Qinghai-Tibet Railway in the plateau gobi environment with strong sunshine, severe freezing and thawing and powerful wind, we took PE (polythene) sand-fixation nets and high vertical wind resistance fences as plane measure and vertical measure respectively to make up a new gobi wind-blown sand prevention system. Field observation and indoor wind tunnel experiment proved its wind-blown sand preventing effect and reliability. Engineering application indicated that the new wind-blown sand prevention system possessed advantages of wind erosion resistance, reusability, long-life and environment protection, and at the same time it reduced daily maintenance workload. So the wind-blown sand prevention system could effectively prevent the gobi wind-blown sand damage on the railway, and could eventually replace the traditional sand-fixing measures of stone checkerboards, bamboo fence and etc. Under the similar circumstance with characteristics of much gobi wind-blown sand, high altitude, fragile ecological environment and scarcity of traditional wind-blown sand prevention materials, the new prevention system might be much suitable.