Assessment of Unconfined Compressive Strength of Cement Stabilized Marine Clay

Abstract

Abstract Two aspects of deep mixing method, the difference relating strength gain in dry jet mixing (DJM, reagent powder introduced into the ground) and cement deep mixing (CDM, reagent slurry introduced into the ground), and prediction of unconfined compressive strength of cement stabilized marine clay, are discussed in this paper. The first part of this paper concentrates on the difference between DJM and CDM on strength gain, and suggests a guideline for DJM and CDM selection. An indicator in terms of water content ratio, which is defined as the ratio of water content to the liquid limit of the soil, is presented by statistical analysis from the laboratory and field test data as a guideline for the selection of DJM or CDM. Based on the laboratory test data, a mathematical model relating strength gain of cement stabilized marine clay to related variables is developed. A new simple index designated as total water-cement ratio, which is defined as the ratio of water weight in the soil-cement to the weight of cement in dry state, is proposed for interpretation of test data of soil-cement. The proposed method is then verified with available test data published by other different researchers. Keywords: marine claysoil-cementtotal water-cement ratiounconfined compressive strengthwater content ratio Financial supports from the Jiangsu Provincial Transpotation Research Fund (No. 03Y007) and Excellent Doctor Dissertation Fund of Southeast University (No. YBJJ0603) are gratefully acknowledged. The authors also would like to thank research assistant Mr. Chengfu Chu, Mr. Guojun Cai, and other colleagues at Southeast University for their hard work and efforts in the field and laboratory tests, which are essential to the successful completion of this manuscript.