The study on the structure and characterization of ancient rammed earth

a special soil formed by artificial selection

tamping and environmental aging in the historical process

is a fundamental problem in the field of rammed earth site protection in the arid area of Northwest China. Fifteen typical sites of rammed earth distributed in three climatic regions and five dynasties were selected as the research objects. Through the basic physical properties test

confined compression test

unconfined uniaxial compression test and structural theoretical analysis

the preliminary research on the structure of rammed earth is carried out. The results show that the particle size distribution

liquidity index

structural yield pressure and the compressive strength of rammed earth at 15 typical sites show regular changes with building age and environment. The compressibility

strength and stress-strain characteristics of undisturbed and remolded rammed earth show larger differences; its structure index and the above-mentioned macroscopic properties index have a good consistency. The water-sensitive potential plays a predominant role in the change of structural potential

the disturbance potential and water-sensitive potential have a significantly linear relationship with the dating of construction and drought index.