Abstract
The current blasting compaction faces technical difficulties brought by mud depth increment. The strength similarity theory provides theoretic support for deep mud blasting compaction, offering a large room for blasting parameters optimization. The author applied the strength similarity theory to engineering practice and introduced the deep mud soft foundation blasting compaction, blasting parameters selection, blasting safety and processing effect. According to detection results, the riprap settlement elevation and width can meet design requirements. The riprap bottom interface and bearing layer are well connected. Obvious mud layer is not found in the embankment core. It shows that the application of strength similarity theory achieves the satisfactory effect in the engineering practice.
Highlights
Technical Specifications for Underwater Foundations Treatment by Means of Blasting Method recommends that “the blasting compaction is suitable for the mud with a thickness of 4~12m”
The Specifications recommends that the unit consumption of explosives should generally be 0.45~0.60 g/cm[3] to design the blasting compaction parameters
The filling embankment head lower bottom and surrounding mud will have the original structure destructed, instantly losing the structural strength and bearing capacity; when the filling masonry load increases, and the impact load of the deep mud strongly distributed by the blasting exceeds the shear strength, the riprap will directionally slide and settle for deep mudstrong replacement, which is inconsistent with the focus highlighted by the conventional geometric similarity theory
Summary
Technical Specifications for Underwater Foundations Treatment by Means of Blasting Method recommends that “the blasting compaction is suitable for the mud with a thickness of 4~12m”. With the increment of blasting compaction thickness, people continue to summarize deep mud blasting compaction construction method during the engineering construction, and find out that the blasting compaction constructions for deep mud and shallow mud are quite different3,4: 1 deep mud blasting compaction requires multiple blasting vibrations reaching the desirable depth, which generally needs the embankment head advancement of 30~40 m; 2 construction parameters for deep mud blasting construction and shallow mud blasting construction are quite different. Both the crane and vibration loader are needed before the explosive reaches the reasonable burial depth. The research results can provide theoretical basis and technical support for the construction practice of blasting compaction of deep silt
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