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.
Highlights
The dynamic compaction method is to free fall the rammer from a height to form shock waves and dynamic stress in the foundation soil so that the foundation soil can reach a high density and have good mechanical properties [1]
Due to the wide range of applications, simple equipment, high economic benefit and significant reinforcement effects, the dynamic compaction method has been widely used in practical engineering
The optimal water content of soil in the test area was determined by a compaction test, and a series of dynamic compaction model tests were carried out by using homemade test equipment to study the influence of the energy level and η value on the efficiency of dynamic compaction under a low water content
Summary
The dynamic compaction method is to free fall the rammer (generally 100–400 kN) from a height (generally 6–40 m) to form shock waves and dynamic stress in the foundation soil so that the foundation soil can reach a high density and have good mechanical properties [1]. The optimal water content of soil in the test area was determined by a compaction test, and a series of dynamic compaction model tests were carried out by using homemade test equipment to study the influence of the energy level and η value (the ratio of the hammer weight to drop distance) on the efficiency of dynamic compaction under a low water content. This is of guiding significance to the economic construction of dynamic compaction in the reinforcement of low moisture foundations
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