无返浆高压旋喷复合灌浆机理离散元模拟研究
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Discrete element simulation of the mechanism of high pressure rotary jet grouting without backflow
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    摘要:

    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,形成复合型固结体。

    Abstract:

    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 rotary jet grouting without backflow are analyzed. The result show that the crack extension length and crack width are positively related to grouting pressure and grouting duration in a certain range. In the stage of drilling and grouting, the main function of grouting is infiltration and compaction. In the high-pressure jet grouting stage, the soil is broken into piles by using the high-pressure jet flow cutting mixing, high-pressure wedge splitting and high-pressure compaction to form a composite consolidation body.

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杨伟军,张维鑫,朱临瑞.无返浆高压旋喷复合灌浆机理离散元模拟研究[J].交通科学与工程,2020,36(1):70-75.
YANG Wei-jun, ZHANG Wei-xin, ZHU Lin-rui. Discrete element simulation of the mechanism of high pressure rotary jet grouting without backflow[J]. Journal of Transport Science and Engineering,2020,36(1):70-75.

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  • 在线发布日期: 2022-06-09
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