STUDY ON MESOSTRUCTURAL CHARACTERISTICS OF SHEAR SURFACES FOR ALLUVIAL-DILUVIAL SUBGRADE FILLERS BASED ON THE N-METHOD

DAI Zeyu; MAO Xuesong; NIE Menglan; LIU Longqi

doi:10.13204/j.gyjzG20071704

Volume 51 Issue 6

Oct. 2021

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DAI Zeyu, MAO Xuesong, NIE Menglan, LIU Longqi. STUDY ON MESOSTRUCTURAL CHARACTERISTICS OF SHEAR SURFACES FOR ALLUVIAL-DILUVIAL SUBGRADE FILLERS BASED ON THE N-METHOD[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(6): 143-149,122. doi: 10.13204/j.gyjzG20071704

Citation:

DAI Zeyu, MAO Xuesong, NIE Menglan, LIU Longqi. STUDY ON MESOSTRUCTURAL CHARACTERISTICS OF SHEAR SURFACES FOR ALLUVIAL-DILUVIAL SUBGRADE FILLERS BASED ON THE N-METHOD[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(6): 143-149,122. doi: 10.13204/j.gyjzG20071704

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STUDY ON MESOSTRUCTURAL CHARACTERISTICS OF SHEAR SURFACES FOR ALLUVIAL-DILUVIAL SUBGRADE FILLERS BASED ON THE N-METHOD

doi: 10.13204/j.gyjzG20071704

1. Key Laboratory for Special Area Highway Engineering, Ministry of Education, PRC School of Highway, Chang'an University, Xi'an 710064, China;
2. Shandong Xiandai University, Jinan 250002, China

Received Date: 2020-07-17
Available Online: 2021-10-27

Abstract

Abstract

In order to study the mechanical and structural characteristics of alluvial-diluvial subgrade fillers with different gradations, the alluvial-diluvial deposits in Luonan, Shaanxi were researched. Based on the N-method in the theory of the maximum density, five different subgrade filler gradations were designed. A large-scale direct shear test was designed to analyze the effects of gradations on the shear strength. A HD digital camera was used to collect the shear plane images of specimens different with gradations. The mesostructure characteristics of the shear plane for specimens were analyzed from the mesoscale by the software of lmage-Pro Plus. The effects of gradations on mechanical properties of fillers were analyzed from the perspective of macro and meso. The results showed that the effect of pore forms in the shear planes on shear characteristics were significant, when the pore form was oblate mainly, the shear strength of fillers was the highest and the form coefficient was 0.55; then it was equiaxed and finally was bar-type. The pore forms of fillers developed from the oblate to the equiaxed, the percentage of the pore areas, fragmentation ratios and fractal dimension values of fillers decreased first and then increased with the increase of n, and finally reached the extreme value when n was 0.55.
- alluvial-diluvial deposit,
- subgrade filler,
- N-method,
- meso-structure,
- digital image processing

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References(20)

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