Effect of organic matter content on physical-mechanicalproperties of sea soft soil

Soil organic matter (SOM) is an important part of marine soft soil, and its role in the physico-mechanical properties of the soil needs to be studied urgently. The Holocene marine soft soil in the Lianyungang area is taken as an example, and a hundred groups of SOM tests and physico-mechanical tests are carried out. The results show that the average SOM content is 0.98% in the study area. The SOM content is most widely distributed in the interval of 0.90%−1.00%. The SOM content is unevenly distributed in space. The SOM content of the parallel coastline has a smaller change than that of the vertical coastline. The top-down change rule is complicated, but the overall trend of the SOM content increases with the increasing depth. SOM content is significantly positively correlated with natural moisture content, plastic limit and liquid limit at the level of 0.01. The SOM content has a significant negative correlation with the natural density, dry density and specific gravity in the soil at the level of 0.01. The S