INFLUENCE OF SEDIMENTARY ENVIRONMENT OF FLUVIAL FACIES ON MECHANICAL PROPERTIES OF SOFT SOIL

The deep fluvial soft soil is widely distributed in Anhui Province. It has a certain influence on the construction of regional engineering. In this paper, the soft soil in the Wuhu plain of Anhui Province is taken as the research object, including the alluvial soft soil of the Yangtze River and the alluvial soft soil of Qingyijiang River. The influence of different depositional environments on the mechanical properties of soft soil is explored. Geotechnical tests and field tests in deep soft soil area were carried out to evaluate their mechanical properties. The depositional environment of the quaternary system is analyzed in the deep soft soil area. The particle size test is used to establish the physical relation between the sedimentary environment and the mechanical properties. The results show that the alluvial soft soil of Qingyijiang River has higher compressive strength and lower compressibility than the alluvial soft soil of Yangtze River. The sedimentary environment of Yangtze River is volatile with strong water power and local existence of fine sand layer. However, in the alluvial plain area of Qingyijiang River, the hydrodynamic force is relatively stable, and the sedimentary environment is stable. Based on the analysis of engineering geology and Quaternary geology, the influence of fluvial facies sedimentary environment on the mechanical properties of soft soil is put forward. The physical relationship between mechanical properties and sedimentary environment is established. It provides the basis for the construction of the soft soil area in Anhui Province.