基于颗粒流方法的土体压密注浆细观机理

发布时间：2018-09-17 17:51

【摘要】：为揭示高压注浆过程中浆液的扩散规律与压密效果,运用颗粒流方法对不同注浆压力、不同土体黏结力、不同土体摩擦因数下浆泡半径以及注浆效果的细观规律和机理进行分析。采用颗粒流fish语言建立注浆过程模型,采用伺服机制施加不同注浆压力模拟注浆过程。研究结果表明:随着注浆压力增大,注浆点周围的土体不断被压缩,孔隙率变小,且0.5 m内土体最易受影响,变形速率最快;与此同时,注浆压力增大,周围土体的附加应力不断增加;对于特定的土体条件,都存在1个最佳注浆压力;土体颗粒之间的黏结力对于浆液扩散的影响较大;土体黏结力较小时,注浆后浆泡半径随注浆压力增大变化明显,但当黏结力较大时,浆泡尺寸基本不随注浆压力变化,即土体黏结力较大时,压密注浆效果大大削弱;土体颗粒之间摩擦因数的变化对注浆效果影响不大。
[Abstract]:In order to reveal the diffusion law and compaction effect of grouting fluid in high pressure grouting process, the particle flow method is applied to the different grouting pressure and different soil adhesion force. The microcosmic law and mechanism of slurry bubble radius and grouting effect under different soil friction coefficient were analyzed. The grouting process model was established by particle flow fish language, and the grouting process was simulated by applying different grouting pressure with servo mechanism. The results show that with the increase of grouting pressure, the soil around the grouting point is continuously compressed, the porosity becomes smaller, and the soil is affected most easily within 0.5 m, and the deformation rate is the fastest, at the same time, the grouting pressure increases. The additional stress of surrounding soil is increasing; for specific soil conditions, there is an optimal grouting pressure; the bond force between soil particles has a greater effect on the slurry diffusion; the soil bonding force is small. The radius of grouting bubble changes obviously with the increase of grouting pressure, but when the bonding force is large, the size of slurry bubble basically does not change with grouting pressure, that is, the compaction grouting effect is greatly weakened when the soil mass bond force is larger. The change of friction coefficient between soil particles has little effect on grouting effect.
【作者单位】：中南大学资源与安全工程学院;广西交通规划勘察设计研究院;
【基金】：国家重点基础研究发展计划(973计划)项目(2015CB060200) 国家自然科学优秀青年基金资助项目(51322403) 广西省交通厅项目(2015年)~~
【分类号】：TU43

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