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| Study on structural parameter of loess based on the mapping of the strain energy density#br# |
| LV Longlong1，LIAO Hongjian1，FU Yingpeng1，XIA Longfei1，2，LENG Xianlun3 |
| (1. Department of Civil Engineering，Xi¢an Jiaotong University，Xi¢an，Shaanxi 710049，China；2. Shaanxi Provincial Land Engineering Construction Group，Key Laboratory of Degraded and Unused Land Consolidation Engineering，Ministry of Natural Resources，Xi¢an Jiaotong University，Xi'an，Shaanxi 710075，China；3. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract The destruction of natural soils occurs when the external loading energy is greater than the limit deformation energy of the soils，thus，a structure parameter in terms of the deformation energy is more suitable to describe the essential characteristic of soil structure. The confined compression tests were conducted on compacted remolded and undisturbed loess samples with various water contents and dry densities from the Taohua Hill，Yan¢an city. Test results suggest that there is an obvious piecewise linear relationship between the void ratio e and the vertical pressure P in -lgP bi-logarithmic coordinate system. Based on this，a structure parameter in terms of the mapping energy was derived according to the strain energy density theory，and further extended into complex loading conditions. Moreover，the verification of the proposed parameter was carried out based on the oedometer tests on remolded and undisturbed soils with different water contents，dry densities，burial depths and particle size distributions，as well as the isotropic compression tests with various water contents. The results show that the proposed parameter has a clearly physical meaning and is able to represent the soil structure quantitatively and accurately under diverse experimental conditions.
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2022, Vol. 41 
