Abstract
Grouted micropiles are widely used in transmission tower foundations and in situ reinforcement in China. This paper deals with the grouting effect on the lateral performance of grouted micropiles embedded in marine soft clay, especially with an external driving shoe. Full-scale lateral loading tests on both grouted and non-grouted micropiles were conducted. The equivalent diameter of a grouted micropile was determined using the cylindrical cavity expansion method and the empirical value of the equivalent diameter was also calculated. The test results showed that, compared with a non-grouted micropile, the lateral bearing capacity of the grouted micropile was improved by 3·75 times. The empirical equivalent diameter was determined to be about 1·5 times the diameter of the steel pipe used, and this was used to predict lateral load–displacement responses of the grouted micropile.
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