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用空气幕下沉沉井是降低沉井下沉时侧面阻力有效的施工方法之一,近年来国内虽有不少沉井已经采用,但由于一些技术问题尚未解决,对主要技术参数的选用缺乏依据,因此安排了这次试验。试验的目的主要是搞清现存的有关压气方面的问题,包括:①空气幕在粘性土中的使用效果;②气龛有效作用面积;③压气时气压与气龛入土深度的关系;④喷气孔的大小对压气效果的影响及堵塞情况。试验在九江长江大桥北岸铁路引桥050号墩进行。从1978年底开始,中途因故停约半年,至1980年7月结束。现将压气方面几项试验结果整理出来。关
The use of air curtain sinking wells is one of the effective ways to reduce the side resistance when the sunk shaft sinks. Although many caisson wells have been used in China in recent years, some technical problems have not yet been solved and the selection of the main technical parameters is lacking. Therefore, Arranged for this experiment. The main purpose of the test is to find out the existing problems related to gas pressure, including: ① the effect of air curtain in cohesive soil; ② the effective area of air niche; ③ the relationship between air pressure and the depth of soil into the niche; The impact of the size of the pressure effect and congestion. The test was carried out at No. 050 pier of North Approach Railway of Jiujiang Yangtze River Bridge. From the end of 1978, halted for about half a year for some reason and ended in July 1980. Compression now several test results sorted out. turn off