The University of Tokyo · 공학
이 연구실은 입자 체계의 거친 거동과 파손 거동을 미세구조적 관점에서 해석하는 데 초점을 맞추고 있습니다. 주로 음향 에미션(Acoustic Emission, AE) 기법을 활용해 모래 토양 내에서의 입자 분쇄, 재배열, 그리고 파손의 진행 과정을 실시간으로 정량화하고 시각화하는 데 기여하고 있습니다. 특히, 다양한 조건(압축 응력, 밀도, 시멘트 함량 등)에서의 삼축 압축 시험과 AE 측정을 융합한 실험적 접근을 통해 기계적 거동과 미세구조적 변화 간의 상관관계를 규명하고 있습니다. 이는 토양의 파손 메커니즘 이해 및 지반 안정성 평가에 기여하는 기초 연구입니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Since the mechanical failure of granular soils is the macro-manifestation of complex internal particle interactions, studying this relevant issue from micro-scale perspective is of fundamental importance. Acoustic Emission (AE) has become a promising approach for this purpose; however, its synthetic and validating study on granular soils with various ground conditions is far from substantive. In an attempt to verify and correlate the relationship between AE behaviors and mechanical behaviors of
The acoustic emission (AE) technique can be used to locate failure-induced AE sources and provides an alternative to continuously visualise the development of failures inside stressed materials; however, a literature review reveals almost no studies regarding its application for source location in granular materials. Yet the visualisation of ubiquitously observed strain localisation and shear banding is critical to an in-depth understanding of the progressive failure mechanism of granular materi
Abstract The study of failure mechanisms from a microperspective demands a comprehensive understanding of the initiation and evolution of shear banding within granular materials. However, this topic is not fully understood due to the technical constraints in continuous quantification of the failure degree and visualization of particle interactions within soil specimens due to their inherent opacity. This paper reports the possibility of acoustic emission (AE) technique in characterizing the micr
To investigate the behaviour of sands at the particle-scale during shear failure, a series of triaxial compression tests was conducted on dry sands with varying confining stresses and relative densities. These tests were complemented by acoustic emission (AE) monitoring to analyse the frequency-dependent AE signals and characterise particle interactions in terms of crushing (>100 kHz) and rearrangement (<100 kHz). The results reveal a linear relationship between the relative breakage index
This study investigates the impact of cementation on the mechanical behaviour of sands with various cement contents (CSR – weight of cement relative to the total dry weight of the soil–cement mixture) in drained triaxial compression, employing both acoustic emission (AE) and environmental scanning electron microscopy measurements. The experimental findings, encompassing quantitative statistics of stress–strain relations, microstructural variations and AE characteristics, demonstrate that the add
This study investigates particle crushing mechanisms in granular soils during shearing through staged triaxial compression experiments performed at prescribed axial strains and varying confining stresses, integrating a high-performance acoustic emission (AE) measurement system. The study analyzed particle crushing-related parameters using grain size distribution (GSD)-based indices (relative breakage index B r and its rate Δ B r ) and AE-based parameters (high-frequency AE hits and hit rates ).
