基于颗粒流方法的土体压密注浆细观机理  

Meso-mechanism of compaction grouting in soil based on particle flow method

作　　者：周子龙[1] 赵云龙[1] 陈钊 杜雪明[1] 吴志波[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]广西交通规划勘察设计研究院,广西南宁530029

出　　处：《中南大学学报（自然科学版）》2017年第2期465-472,共8页Journal of Central South University:Science and Technology

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)~~

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。In order to reveal the diffusion law and consolidation effect in high pressure slurry of compaction grouting, the particle flow method was used to analyze the meso-mechanism of grouting in consideration of different grouting pressures, soil cohesion force and friction coefficient. With particle flow fish language, the grouting model was established, and the servo mechanism was used to apply different grouting pressures to simulate the grouting process. The results show that with the increase of grouting pressure, soil around the grouting point is compressed gradually, and the soil porosity becomes smaller. The soil within radius of 0.5 m around the grouting point is the most sensitive to the grouting pressure and deforms most rapidly. The additional stress of the soil around the grouting point increases with the increase of the grouting pressure. There is an optimum grouting pressure for a specific soil condition in practice. The cohesion force of soil particles has significant influence on the slurry diffusion. When the soil cohesion force is small, the radius of grouting bulbs increases with the increase of grouting pressure. When the soil cohesion force is big, grouting pressure has little effect of on the grouting bulb size. The effect of compaction grouting is undermined in this situation greatly. The friction coefficient of soil particles has little influence on the grouting performance.

关 键 词：压密注浆 颗粒流 细观机理 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]