English：

El Salvador is located in a region of Latin America that is prone to frequent volcanic activity.The seabed in the area where the proposed pier will be constructed consists of volcanic ash and graveldeposits,with the nearshore area characterized by pebble beaches. Due to the long-term influence ofsurge waves, a dense pebble layer with a thickness of 5 —— 8m forms in the upper seabed. In some areas,the pebble size is relatively large,while the underlying layers consist of andesite and tuff. Based onpractical engineering considerations, this paper analyzes the feasibility of construction under thesegeological conditions and proposes a punching and pile-driving process. High-strain testing techniqueswere employed to assess the integrity of the piles. The study shows that the punching and pile-drivingprocess exhibits good stability and construction effectiveness in the geological environment of dense pebblelayer.