Comparative Analysis of Embedded Stability of Support Structures Under the Distribution of Soil Pressure in New and Old Regulations
"Technical Specification for Building Foundation Pit Support,"provides specific provisions for the calcula-tion of anti overturning stability,embedded stability,and soil pressure calculation mode of single support point sup-port structures in foundation pits.The soil pressure is calculated according to the classic Rankine soil pressure theory,and the active soil pressure distribution mode is a triangle.However,there is currently no specification for the calcula-tion mode of soil pressure for multi support point support structures,making the design of such projects more difficult.The article explores this as a breakthrough point and takes a foundation pit support project in Bijie City,Guizhou Prov-ince as an example.The theoretical basis for calculation is based on two new and old regulations,namely"Technical Specification for Building Foundation Pit Support"(JGJ 120-2012)and"Technical Specification for Building Foun-dation Pit Support"(JGJ 120-99),Calculate and analyze the embedding depth and embedding stability of multi sup-port structures under two different states of triangular and rectangular distribution of active soil pressure at the bottom of the pit,and use the large-scale finite element simulation software midas GTS to numerically simulate the calculated different embedding depths.The results show that the minimum embedding depth calculated under the new regulation's soil pressure distribution mode is smaller than that of the old regulation,with a larger increase in anti overturning sta-bility coefficient,a slight increase in overall stability safety coefficient,and good embedding stability.For the design of multi support structures for this type of foundation pit,using the soil pressure calculation mode in the new version of the regulations is more in line with the actual soil pressure distribution and can provide higher safety reserves.Re-duce costs of the project and can provide reference for such projects.
soil pressuremulti-support support structurenumerical simulationcalculation modeMidas GTS
NETL
NSTL
万方数据
维普
