中南大学学报（自然科学版）2025，Vol.56Issue(4)：1514-1522,9.DOI:10.11817/j.issn.1672-7207.2025.04.022
钙质砂地基桩贯入声发射特征信息演化规律与颗粒破碎机制
Evolution of acoustic emission characteristic and particle breakage mechanism of pile penetration in calcareous sand foundation
摘要
Abstract
Three model pile penetration tests were conducted on calcareous sand foundations with three different relative densities(Dr=30％,60％,75％),incorporated with a high-precision acoustic emission(AE)monitoring system.The results indicate that a good correspondence between the penetration resistance-depth and AE hit rate-depth relations is observed,and both the penetration resistance and cumulative AE hits increase with the increase in relative density.The evolution trend of cumulative high-frequency(＞100 kHz)AE hits is consistent with that of the relative breakage index(Br),suggesting that the evolution pattern of high-frequency AE signals during pile penetration can reflect the particle crushing evolution.Throughout the entire pile penetration process,low-frequency AE signals(＜100 kHz)are predominant,while high-frequency AE signals(＞100 kHz)increase with greater penetration depth and higher foundation relative density,which indicates that the predominant micro-mechanical behavior of particles during pile penetration is characterized by sliding,and the extent of particle breakage increases with penetration depth and relative density of the foundation.This research provides methodological support and theoretical basis for elucidating the pile-soil interaction mechanism in calcareous sand foundations.关键词
桩基/钙质砂/颗粒破碎/声发射/模型试验/相对密实度Key words
pile foundation/calcareous sand/particle breakage/acoustic emission/model test/relative density分类
建筑与水利引用本文复制引用
刘昂,王乾坤,张迁,林文丽,章定文..钙质砂地基桩贯入声发射特征信息演化规律与颗粒破碎机制[J].中南大学学报（自然科学版）,2025,56(4):1514-1522,9.基金项目
国家自然科学基金资助项目(42472347) （42472347）
国家重点研发计划项目(2020YFC1808101)(Project(42472347)supported by the National Natural Science Foundation of China （2020YFC1808101）
Project(2020YFC1808101)supported by National Key Research and Development Program of China) （2020YFC1808101）
