半隐蔽式麦草方格沙障防护带宽度的探讨

建国以来,随着经济建设事业的发展,业已修筑的和正在修筑的通过沙漠地带的铁路有:包(头)兰(州)线、干(塘)武(威)线、乌(达)吉(兰泰)线、通(辽)让(湖路)线、沙(城)通(辽)线等等。由于风沙危害,沙漠铁路两刚必须进行防护,以防止流沙掩埋线路,危及行车安全。经过多年实践,除在适宜地段采用植物措施取得了较好的成效外,应用最广的工程防沙措施就是半隐蔽式麦草方格(1×1米)沙障。

A Research on the Width of the Protection Belt of Half-Hidden Straw Checkerboard Barriers

In this paper the efficiency of the half-hidden straw checkerboard barrier reducing wind velocity and controlling sand-driving wind as well as various factors influencing the belt width of 1×1 straw checkerboard barriers have been discussed from the view-point of protecting of railway from sand burying. Knowing that shifting sand from outside is a prerequisite for burying the protection belt mainly by sand-driving wind and through observrvation, both the wind velocity curve and sand amount curve after the sand-driving wind entered the belt were obtained. It has been found out wind velocity at a height of 20 cm above the sand surface decreases greatly within 20m and sand amount at a height of 10 cm reduces sharply within 5 m. According to these results, which in combination with average annual width of protection belt buried by shifting sand and the effective life-span of barriers, a reasonable and valid formula used for determining the width of protection belt was developped.