Abstract:Based on experimental data of physical mechanics of two borehole sediments in Jining city, physical characteristics, plastic characteristics and compression characteristics of strata have been analyzed comprehensively, the effective gravity pressure and preconsolidation pressure have been calculated, the consolidation state of strata has been judged, the relationship between the change of physical mechanics characteristics of strata and land subsidence has been studied, and the ground subsidence compression layer group has been divided. It is showed that the general trend of physical properties of soil layers above 204.5m in Jining city is controlled by gravity pressure, and the change of pore water pressure is an important controlling factor of relative change. Secondary fluctuation is closely related to mineral composition and particle distribution, and is also the result of multiple factors combined. The strata above 100m are of medium compressibility and normal consolidation, while the strata between 100m and 200m are of low compressibility and over consolidation. The causes are related to the excessive exploitation of groundwater, and are the main strata of historical land subsidence. The strata in this area can be divided into five strata with obvious characteristics of land subsidence compression.
