贮灰场灰渣沉积特点及深埋排水管上覆土压力的离心模型试验研究

Centrifugal Test on Deposition of Fly Ash and Earth Pressure Acting on Deep Conduit

采用先进的离心模型试验手段对贮灰场灰渣沉积特点和贮灰场深埋排水管上覆土压力随沉积灰渣厚度的变化规律进行了研究和探讨。研究结果表明:沉积灰渣的干密度有随沉积深度增加而增大的趋势。干密度随沉积深度而增加的现象以表层10余米范围内最为明显,在此深度以下干密度趋于稳定;从离心试验结果看,上埋式贮灰场深埋排水管道的垂直土压力集中系数K随沉积灰渣厚度增加呈递减趋势,但试验得到的K值明显小于设计常用值。

The density of deposition of fly ash and the earth pressure acting on the deep conduit of embankment type beneath the fly ash deposit were studied through centrifugal model test. From the test results, it is shown that the density increases obviously with the depth less than 10 m and varies slightly with the depth more than 10 m.; the value of K (The ratio of the earth pressure acting on the conduit to the soil weight over it)decrease with the depth of fly ash deposit over the conduit,the value obtained from this test is obviously less than the one proposed by the design standard?