基于MatDEM的松散地基喷浆加固浆液扩散规律  

Grout diffusion law for grouting reinforcement of loose foundation based on MatDEM

作　　者：郭静 赵振华 马梦媛 史长远 姚占勇 赵秋红 姚凯 GUO Jing;ZHAO Zhenhua;MA Mengyuan;SHI Changyuan;YAO Zhanyong;ZHAO Qiuhong;YAO Kai(Jinan Urban Construction Group Co.,Ltd.,Jinan 250014,Shandong,China;Jinan Yellow River Road and Bridge Construction Group Co.,Ltd.,Jinan 250013,Shandong,China;School of Qilu Transportation,Shandong University,Jinan 250002,Shandong,China)

机构地区：[1]济南城市建设集团有限公司,山东济南250014 [2]济南黄河路桥建设集团有限公司,山东济南250013 [3]山东大学齐鲁交通学院,山东济南250002

出　　处：《山东大学学报（工学版）》2024年第4期106-114,121,共10页Journal of Shandong University（Engineering Science）

基　　金：山东省自然科学基金资助项目(ZR2021QE254);山东省优秀青年科学基金资助项目(海外)(2022HWYQ-016);教育部“春晖计划”合作科研资助项目(HZKY20220470)。

摘　　要：为分析松散地基喷浆加固过程中浆液扩散规律,借助MatDEM软件生成模拟土层,基于孔隙密度流原理实现喷浆过程可视化,生成土体颗粒位移场。从现有成桩直径预测公式出发,分析基于极限侵蚀距离的成桩直径预测公式的可靠性,基于模拟结果,通过分析喷浆压力、颗粒粒径等对修正参数的影响,对成桩直径预测公式进行修正,将现场试验中双管法旋喷喷浆施工参数及原位土体力学参数带入修正后成桩直径预测公式计算,与现场试验桩体开挖后实测直径进行对比,验证了修正公式的可靠性。In order to analyze the slurry diffusion law in the process of grouting reinforcement of loose foundation,the simulated soil layer was generated by MatDEM software.At the same time,the principle of pore density flow was used to realize the visualization of the grouting process,and the displacement field of soil particles was generated to analyze the slurry diffusion law.The reliability and influencing factors of the pile diameter prediction formula based on the ultimate erosion distance were analyzed.Based on the simulation results,the correction parameters of the ultimate erosion distance in the pile diameter prediction formula were proposed.By analyzing the influence of grouting pressure and particle size on the correction parameters,the prediction formula of pile diameter after correction was given.When the grouting pressure was small,the error of the formula was obvious.The construction parameters of the on-site double-pipe jet grouting method and the mechanical parameters of the in-situ soil were brought into the modified pile diameter prediction formula to obtain the predicted value of the slurry diffusion distance,and compared with the diameter of the pile after excavation in the field test.It could be seen that the reliability of the modified formula was improved.

关 键 词：MatDEM 高压喷浆 孔隙密度流 基础加固 公式修正 

分 类 号：TV5431[水利工程—水利水电工程]