jaue2019-032: Evaluation Study of Sponge City Planning on Urban Remoulded Soil

Abstract

Because of the high speed development and the continuous progress of urbanization in northwest area of 
China, urban land filling is becoming a common infrastructure construction style. Due to the particularity of 
loess, the strength and deformation characteristics of filling loess site are very complex, so it is of great 
theoretical and engineering significance to study the influence of different pore distribution on settlement 
deformation of structural loess. In the other hand, sponge city is becoming a critical environmental urban 
planning method in recent years. How to apply the sponge city development on remoulded soil, according to the 
compression characteristics and shear strength of the original loess recovered from the site and remolded loess 
prepared in the laboratory should be studied. 
In this paper, through a series of laboratory compression and direct shear tests, the law of pore ratio, pore 
distribution and settlement change was explored by using soil mechanics theory and FLAC numerical 
calculation and analysis. Firstly, the physical parameters and compaction characteristics of undisturbed soil are 
determined by geotechnical test. Based on the experimental research, the layered summation method of 
settlement calculation, the improved secant modulus method and FLAC numerical calculation were used to 
calculate the settlement amount of the original loess site. Finally, the improved secant modulus method is used 
to calculate the settlement amount of remolded loess site and compare it with the original loess site, the 
influence of pore distribution changes on the settlement amount under the same pore ratio is obtained. 
This research explored the strength and deformation characteristics of the remoulded soil site, and the 
application methods for sponge city planning on urban remoulded soil is discussed according to the numerical 
simulation results, which contributes to environmental urban development in Chinese big cities.