期刊论文

Discrete element simulation of the mechanism of high pressure rotary jet grouting without backflow

中文

交通科学与工程

1674-599X

2020

36

1

70-75

10.16544/j.cnki.cn43-1494/u.2020.01.012

本校为第一机构

采用离散元数值模拟软件PFC2D5.0,建立砂性土颗粒的高压灌浆模型,将不同灌浆压力和灌浆持续时间对劈楔裂缝发生、发展规律的影响进行了对比。依据孔隙率变化曲线和孔压变化曲线,对高压灌浆过程中产生的渗透作用、挤密作用及挤劈作用进行了细观分析。依据某堤坝防渗加固现场取芯试验结果,分析了无返浆高压旋喷复合灌浆技术固结体组成及灌浆机理。研究结果表明:裂隙扩展长度、裂缝宽度与灌浆压力和灌浆持续时间在一定范围内成正相关关系。在无返浆高压旋喷复合灌浆技术钻灌一体阶段,浆液以渗透挤密作用为主;在高压旋喷阶段,利用高压喷射流冲切掺搅、高压劈楔及高压挤密作用进行破土成桩,形成复合型...

The high-pressure grouting model of sandy soil particles was established by using the software PFC2D5.0 of discrete element numerical simulation.The occurrence and development law of wedge crack under different grouting pressure and grouting duration were compared.According to the change curve of porosity and pore pressure,the permeability,compaction and splitting in the process of high-pressure grouting are analyzed.Based on the results of core test in the field of seepage control and reinforcement of a dam,the composition and grouting mechanism of the consolidation body of the high-pressure ...