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Xie Xianguarg; Wang Wei; Chen Yumao(China Academy of Railway Sciences) (Chengdu Railway Beurau)  
Since 1972, a great amount of protection engineerings have been built along ChengduKunming Railway which spended over 200 million yuan. These engineerings include chiefly drainge ditches, check dams. bypassing strutures and anti-slide piles. Through paying a systematic return visit and investigation for these engineerings. we found that most of them have made the investment yield well so as to promote the safety of railway operation.In this paper. the debris flow disasters and its protection engineerings along ChengduKunming Railway have been outlined. In order to understand the working situation ofthem. we chose the engineerings in 40 debris flow gullies to be surveyed and analysed by return visit in 1992. Among them. there are 5 debris flow gullies in which the aqueducts were tuilt (taking the proportion of 12. 5% in total) .32 debris flow gullies in which the drainage ditches were constructed (80%) . 17 debris flow gullies in which the check dams were erected (42. 5%) and 3 debris flow gullies in which the anti-slide piles were constructed (7. 5%). Then. We assess the engineerings on the basis of the assessment means which we have formulated and the field investigetion results. Finally the following outcomes have been gained.(1)The effect of the engineerings in 28 debris flow gullies is tetter, whose proportion in total is 70%.(2)The effect of the enginetrings in 9 debris flow gullies is general. whose proportion is 22 .5%.(3)The effect of the engineerings in 3 debris flow gulles is worse, whose proportion is 7. 5%Besides, we draw the tffect of the engineerings from the trend that the debris flow disasters reduce year after year and affirm that the ecnomic tenefit of the protection engineerings is remarkable with their investment.
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