Research on the application of dynamic cone penetration test in evaluating the effectiveness of soft soil treatment in some areas of Hai Duong province, Vietnam

Abstract

In soft soil treatment, assessing the quality of on-site treatment is very important. Common field testing methods used in Vietnam include Cone Penetration Testing (CPT), Standard Penetration Testing (SPT), and Field Vane Testing (FVT). Dynamic cone penetration testing (DCP) testing is a simple and portable field method that allows for the assessment of soil homogeneity, density, or state and the determination of some physical and mechanical properties of the soil. This paper analyzes andsystematizes the content, subjects, and requirements for evaluating the quality of soft ground treatment. It also assesses the applicability of the Dynamic cone penetration testing and presents some experimental results from Hai Duong province. The results show that the DCP test can evaluatehomogeneity and point out unsatisfactory sections in soil-cement piles. For soft ground treated by cement -fly ash -marine sand piles (CFMS), Dynamic cone penetration testing on three groups of the piles with different binder contents (CKD = 5%, 10%, 15%) shows that the dynamic cone resistance (qd) increases with the binder content. Using DCP testing on the ground at three stages ofconstruction, immediately after construction, and 10 days post-construction allowedfor the determination of the effectiveness of each mechanical compaction and consolidation process for each type of soil