Foam concrete materials are
widely used in tunnel vibration damping design. Understanding the development
of microscopic crack damage under compressive loading and its influence on
macroscopic mechanical behavior is essential. Therefore, the authors propose a
simulation method based on X-ray-computed tomography(X-CT) imaging to analyze
the damage process from a macroscopic perspective. First, X-CT imaging is employed to capture the cellular structure of foam
concrete, followed by binarization to generate a binary map for constructing a
mesoscopic model. A custom Python script is integrated into the cohesive force
unit to simulate the damage and cracking process of the foam concrete model.
The microscopic damage behavior under varying porosities is further investigated.
The results indicate the following: (1) The simulated stress-strain curves during the rising and stable stages align well with
the experimental data, offering a novel approach for understanding the detailed
damage mechanisms and calibrating the macro-mechanical
parameters of foam concrete. (2) During uniaxial compression, the cementitious
matrix linking adjacent pores acts as a "pillar", with the contact normal pressure increasing as strain accumulates
and connectivity develops. Foam concrete primarily exhibits shear-induced damage under compression. (3) Lower porosity significantly
enhances the peak compressive strength; however, the material may develop
extensive local cracks, preventing optimal utilization of the pore space.
LIU Jiguo
,
CUI Qinglong
,
SHU Heng
,
PENG Wenbo
,
YANG Xue
. Simulation of Microscopic
Damage to Foam Concrete Based on X-Ray-Computed Tomography Imaging[J]. Tunnel Construction, 2024
, 44(10)
: 1941
-1949
.
DOI: 10.3973/j.issn.2096-4498.2024.10.003
