烟台大学学报（自然科学与工程版）2025，Vol.38Issue(1)：81-91,11.DOI:10.13951/j.cnki.37-1213/n.231004
悬浮型水泥土搅拌桩复合地基沉降及桩土应力比的颗粒流模拟
Particle Flow Simulation of Settlement and Pile-Soil Stress Ratio of Suspended Cement-Soil Mixing Pile Composite Foundation
摘要
Abstract
To explore the settlement and pile-soil stress ratio characteristics of suspended cement-soil mixing pile composite foundations,a two-dimensional particle flow model of single-pile composite foundation was established u-sing the discrete element software PFC2D.The deformation and bearing characteristics of the composite foundation with varying degrees of suspension and cement mixing ratios were simulated from a meso-scopic perspective,and the settlement of composite foundation,pile-soil stress ratio,particle bond failure,contact force chain and energy change law were analyzed.The simulation results show that with the increase in pile suspension degree,the settle-ment of the composite foundation decreases.The pile-soil stress ratio of the composite foundation with 68％and 76％suspension degree initially increases and then stabilizes.For composite foundations with suspension degree of 84％,92％,and 100％,the pile-soil stress ratio initially increases and then decreases.With the increase in pile cement mixing ratio,the settlement of the composite foundation decreases.The pile-soil stress ratio of composite foundations with cement mixing ratios of 10％,15％,20％and 25％exhibits a trend of first increasing to a peak and then decreasing,with the peak amplitude gradually decreasing.The end bearing type is more prone to damage than the other four types of suspension cement-soil mixing pile composite foundations.Numerous macro cracks,formed by bond fracture,are generated at the pile end and the upper part of the pile body.These macro cracks ex-pand further under the influence of strain energy.During the expansion process,friction energy exceeds strain ener-gy and gradually becomes dominant.Some force chains at the damage site break and disappear or become lighter in color,while some force chains are thicker than those in other areas of the pile,leading to concentration of contact forces between particles and ultimately resulting in the composite foundation losing its bearing capacity due to strength failure of the pile body.关键词
悬浮型水泥土搅拌桩/地基沉降/桩土应力比/颗粒流/悬浮度/水泥掺入比Key words
suspended cement-soil mixing pile/foundation settlement/pile-soil stress ratio/particle flow/suspen-sion degree/cement mixing ratio分类
建筑与水利引用本文复制引用
朱宏栋,张江江,程琴辉,徐芳超,陈旭..悬浮型水泥土搅拌桩复合地基沉降及桩土应力比的颗粒流模拟[J].烟台大学学报（自然科学与工程版）,2025,38(1):81-91,11.基金项目
四川省科技计划(应用基础研究)(2021YJ0394). （应用基础研究）
