Practical Approach to Predicting the K0 Behavior of In Situ Sandy Gravel

To investigate the scale effect on at-rest earth pressure coefficient_K0for sandy gravel, a number of_K0tests for sandy gravel were performed by using a new-developed large-size_K0apparatus. The test samples with different maximum particle size_dMare prepared by different techniques, and the scale effect on_K0behavior of sandy gravels is investigated. It is found that the vertical stress_σ′v, preparation technique and_dMall have some influence on the value of_K0for the tested sandy gravels. Since different_dMor preparation techniques all induce the scale effect, the scale effect on_K0of sandy gravel can not be ignored. Based on the test data of sandy gravel, a description of_K0considering scale effect as well asσv′is proposed and an approach to predict the_K0behavior of sandy gravel in situ is obtained. Furthermore, the accuracy and applicability of the approach is verified.

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