Model test study on the effect of dynamic compaction under low water content

Abstract

Dynamic compaction is a cost-effective foundation treatment technology, that is widely used in various types and conditions of foundations. However, due to the limitation of natural conditions (water content between 3% and 8%) in north-western China, it is difficult to meet the requirements of the optimal water content during dynamic compaction. To better treat a foundation with a low water content, a series of model tests were carried out by using homemade test equipment to study the influence of the ramming energy and η value on the efficiency of dynamic compaction under a low water content. The results showed that the improvement of the energy level could compensate for the poor effect of dynamic compaction caused by a low water content in arid regions. Compared with that at the optimal water content, the efficiency of dynamic compaction was 58.1% to 66.2% at a low water content and excited the optimal energy level. Increasing the η value was also beneficial to improving the effect of dynamic compaction. Hence, the optimal energy level combined with the appropriate η value is of great merit in treating the foundation of arid regions by using the dynamic compaction method, which provides new parameter suggestions and engineering guidance for dynamic compaction construction in arid areas.

A new method for rapid preparing high-strength saturated clay samples in large-scale model tests

“…The compaction process progresses by incrementally increasing the number of compaction passes until no further soil settlement occurs. At this juncture, the compaction passes are designated as the single-layer compaction passes N. The rationale for conducting tests at the minimum moisture content is that, although compaction can enhance soil density under lower moisture conditions, the density increase may stagnate or become negligible [5]. Therefore, this number of compaction passes can more accurately reflect the compaction ability of the soil, i.e., the optimal number of single-layer compaction passes for the soil layer.…”

Enhancing Ground Improvement of Dredging Landfill in South Korea’s Western Coastal Region: Insights into Dynamic Compaction Characteristics

“…Jiang et al (2021) emphasized the importance of considering the effect of compaction energy in finite element analysis when comparing factors such as the arrangement of compaction equipment, compaction interval, and time interval in dynamic compaction construction [19]. Similarly, Zhang et al (2021) reported that dynamic compaction is a costeffective foundation treatment technology; in particular, the effect of dynamic compaction can be enhanced by improving the energy level even in low-moisture content soils [20]. These findings align with the increased dynamic compaction efficiency observed in the soil box test results, which are achieved by altering the dynamic compaction energy by changing the weight of pounder and height of tamping.…”

“…Menard and Broise (1975) [24] Silty sands 0.4-0.6 Mayne (1984) [32] Silty sands 0.5 Lukas (1995) [32] Generally soil 0.3-0.8 Lee and Kim (1996) [28] Generally soil 0.31-0.64 Jang et al (2009) [27] Sands 0.25-0.48 Lee et al (2010) [15] Silty sands 0.55-0.85 Elreedy (2017) [33] Finer-grained soils 0.3-0.7 Pastel (2019) [34] Generally soil 0.4-0.8 Li et al (2020) [29] Sands >0.5 Zhang et al (2021) [20] Silty clay 0.8…”