地震工程学报2026，Vol.48Issue(4)：828-835,8.DOI:10.20000/j.1000-0844.20241026002
考虑支点摩擦的压实黏土ASCB试样Ⅰ-Ⅱ复合型断裂特性研究
Mixed-mode Ⅰ-Ⅱ fracture characteristics of ASCB compacted clay samples considering the effect of fulcrum friction
摘要
Abstract
To investigate the influence of support friction on the mixed-mode Ⅰ-Ⅱ fracture character-istics of compacted clay using asymmetric semi-circular bending(ASCB)specimens,the ABAQUS finite element software was employed to study the effects of dimensionless crack length(a/R),sup-port span ratio(S2/R),and support friction coefficient(f)on the dimensionless stress intensity factors YⅠ and YⅡ and the dimensionless T-stress(T*).In addition,three-point bending tests were con-ducted on compacted clay to examine the effect of support friction on fracture toughness.The results indicate that under non-pure mode-Ⅱ loading,YⅠ,YⅡ,and T* exhibit a certain degree of reduction with increasing f.Under pure mode-Ⅱ loading,increased f induces stress concentration,altering the stress state at the crack tip and resulting in a transition from pure mode-Ⅱ to mixed-mode Ⅰ-Ⅱ load-ing.The three-point bending tests revealed that when support friction is considered,the use of tradi-tional stress intensity factors results in an overestimation of fracture toughness values.Therefore,when employing fixed supports in three-point bending fracture tests on compacted clay,fracture tough-ness must be calculated based on dimensionless parameters corrected for friction.关键词
支点摩擦/Ⅰ-Ⅱ复合型/半圆弯曲/ABAQUSKey words
fulcrum friction/mixed mode Ⅰ-Ⅱ/semi-circular bending/ABAQUS分类
建筑与水利引用本文复制引用
李玉桥,李旭东,刘忠,陈芳,马路寒,李小磊,江秀兰..考虑支点摩擦的压实黏土ASCB试样Ⅰ-Ⅱ复合型断裂特性研究[J].地震工程学报,2026,48(4):828-835,8.基金项目
国家重点研发计划资助(2024YFC3211202) （2024YFC3211202）
国家自然科学基金资助项目(52109113) （52109113）
水利部堤防安全与病害防治工程技术研究中心开放课题基金资助项目(LSDP202101) （LSDP202101）
重庆市水利科技项目(CQSLK-2022015) （CQSLK-2022015）
