| 基于流体体积法的劈裂注浆有限元分析 |
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| 引用本文： | 朱旻,龚晓南,高翔,刘世明,严佳佳.基于流体体积法的劈裂注浆有限元分析[J].岩土力学,2019,40(11):4523-4532. |
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| 作者姓名： | 朱旻 龚晓南 高翔 刘世明 严佳佳 |
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| 作者单位： | 1. 浙江大学 滨海和城市岩土工程研究中心，浙江 杭州 310058；2. 浙江省城市地下空间开发工程技术研究中心，浙江 杭州 310058；
3. 中国电建集团华东勘测设计研究院有限公司，浙江 杭州 311122；4. 浙江省智慧轨道交通工程技术研究中心，浙江 杭州 311122 |
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| 基金项目： | 国家自然科学基金（No. 51778575，No. 51608477）。 |
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| 摘 要： | 劈裂注浆作为一种有效的土体加固方法，其理论研究落后于工程实践。提出了基于弥散裂缝模型和流体体积法的劈裂注浆有限元分析方法，并通过ABAQUS二次开发编写劈裂注浆有限元程序。数值分析结果能与室内试验较好吻合，验证了有限元算法的合理性。在此基础上研究了注浆孔埋深和注浆流量对劈裂浆脉形状的影响。结果表明，劈裂注浆过程可分为起劈和劈裂发展两个阶段。当劈裂浆脉扩展到模型边界后，继续注浆会引起注浆压力的大幅提高和已有浆脉宽度的增加。随着注浆孔埋深的增加，浆脉分支减少，长度减小，宽度增加，劈裂浆脉形状的主要控制因素从土体参数的随机性变成大小主应力值的差异。注浆量一定的情况下，注浆速率越大，劈裂浆脉长度越短，宽度越大，注浆终压也越大。研究为劈裂注浆的工程应用提供理论支撑。
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| 关 键 词： | 劈裂注浆 弥散裂缝模型 流体体积法 注浆流量 |
| 收稿时间： | 2018-11-05 |
Volume of fluid method based finite element analysis of fracture grouting |
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| ZHU Min,GONG Xiao-nan,GAO Xiang,LIU Shi-ming,YAN Jia-jia.Volume of fluid method based finite element analysis of fracture grouting[J].Rock and Soil Mechanics,2019,40(11):4523-4532. |
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| Authors: | ZHU Min GONG Xiao-nan GAO Xiang LIU Shi-ming YAN Jia-jia |
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| Institution: | 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China;
2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou, Zhejiang 310058, China;
3. Power China Huadong Engineering Corporation Limited, Hangzhou, Zhejiang 311122, China;
4. Engineering Research Center of Smart Rail Transportation of Zhejiang Province, Hangzhou, Zhejiang 311122, China |
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| Abstract: | Fracture grouting is an effective method for soil reinforcement, yet the theoretical studies are far behind engineering practice. Using secondary-developed ABAQUS, a finite element model of fracture grouting is proposed based on the smeared crack model and VOF (volume of fluid) method. Results of FEM analysis are in good agreement with the laboratory tests. The effects of grouting depth and injection rate on the grout vein shapes are then investigated. The results show that fracture process can be divided into two stages: fracture initiation and extension. When the grout veins reach model boundary, higher grouting pressure is needed to increase the width of grout veins. With the grouting depth increases, the grout veins have less branches, reducing length and increasing width. The main factors affecting the shape of grout veins change from randomness of soil properties to the difference between major and minor principle stress. For given injection volume, higher injection rate results in shorter and thicker grout veins and higher grouting pressure. The research provides theoretical support for engineering applications of fracture grouting. |
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| Keywords: | fracture grouting smeared crack model volume of fluid method injection rate |
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