|Table of Contents|

Mechanical properties test and constitutive model of discontinuous graded soil-rock mixture(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年2期
Page:
35-44
Research Field:
道路工程
Publishing date:

Info

Title:
Mechanical properties test and constitutive model of discontinuous graded soil-rock mixture
Author(s):
SONG Yang1; 2; 3;  SUN Hong-yuan1;  WANG Qing-zhou4;  SUN Wen-jun2; 3; WANG Lei2;  ZHANG Zhi-bin2
(1.College of Civil Engineering, Hebei University of Architecture, Zhangjiakou 075031,Hebei, China;2.College of Traffic Engineering,Hebei University of Water Resources and Electric Engineering, Cangzhou 061001,Hebei,China;3.Hebei Key Laboratory of Geotechnical Engineering Safety and Deformation Control,Hebei University of Water Resources and Electric Engineering, Cangzhou 061001,Hebei,China;4.School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China)
Keywords:
road engineering;  soil-rock mixture;  large-scale triaxial test;  stone content;  shear strength;  constitutive model
PACS:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2023.02.004
Abstract:
In order to study the mechanical properties of discontinuous graded soil-rock mixture commonly used in mountain road construction, the triaxial shear test of discontinuous graded soil-rock mixture was carried out by using SZ30-40DA large triaxial tester, the effects of different stone contents and confining pressure on the stress-strain relationship, shear strength parameters, stiffness, pore pressure, internal friction angle and cohesion of discontinuous graded soil-rock mixture were analyzed, and the applicability of discontinuous graded soil-rock mixture was analyzed by combining Duncan-Chang model and power law model. The results show that the stress-strain curves of soil-rock mixture show strain hardening characteristics and no strain softening characteristics under different stone contents. When the stone content is low, the stress-strain curve presents a smooth curve, and with the increase of the stone content, the stress-strain curve presents an obvious jump phenomenon. The shear strength of soil-rock mixture increases with the increase of stone content and confining pressure. In the shear process with different stone contents, coarse particles show different crushing degree, and the crushing rate increases with the increase of stone content. The internal friction angle increases with the increase of stone content, while the cohesion decreases with the increase of stone content. When the stone content is 70%, the internal friction angle reaches the maximum and the cohesion is the minimum. The stiffness softening phenomenon is obvious in the early stage. With the increase of stone content, the soil shows a certain skeletonization effect and the ability to resist deformation is enhanced. The pore pressure is greatly affected by axial strain and confining pressure, and increases first and then decreases with the increase of axial strain, and increases with the increase of confining pressure. Duncan-Chang model has a certain gap in the application of discontinuous gradation of soil-rock mixture, while the fitting degree of power law model is better than Duncan-Chang model, which can better reflect the strain hardening characteristics of soil-rock mixture under discontinuous gradation.3 tabs, 11 figs, 26 refs.

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Last Update: 2023-03-30