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| 低渗透致密细砂层劈裂注浆数值模拟研究 |
| Numerical simulation study on the splitting grouting mechanism of dense fine sand layer |
| 投稿时间：2024-10-04 修订日期：2024-11-23 |
| DOI： |
| 中文关键词: 劈裂注浆 扩展过程 数值模拟 浆脉形态 影响因素 |
| 英文关键词:Splitting grouting Expansion process Numerical simulation Plasma vein morphology influence factor |
| 基金项目:国家自然科学(62003313)；河南省科技厅重点研发项目(231111322100)；河南省高等学校重点科研项目(24A560011)；黄河科技学院博士科研启动(02032695) |
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| 中文摘要: |
| 数字信息化的高速发展为劈裂注浆机理分析提供了利好条件,数值计算与理论分析、模型试验一起,构成工程科学问题的主流方法。基于Biot固结理论和两相流理论计算砂层的应力应变和流体压力,采用流体体积法(VOF)追踪浆-水界面,对低渗透致密砂层劈裂注浆规律进行了有限元计算。计算表明:初始阶段浆液能量较小,劈裂扩展极其有限,当注浆压力达2MPa后,劈裂缝逐渐形成并扩展、贯通,劈裂浆脉初步成型。当注浆压力达到3MPa时,浆脉长度不断延伸,宽度不断扩大。随砂层密实度增加,砂层压缩模量、刚度等力学性能明显提升,劈裂注浆难度逐渐加大；随浆液黏度增加,浆液扩散过程中所受摩阻作用不断增加,劈裂注浆效果也逐渐变差。注浆压力作用下砂层内产生纵横交错的网状浆脉,浆脉起到“加筋”和骨架支撑作用,显著提高了砂层的整体力学性能。青岛地铁现场实测与数值计算规律一致,表明本文有限元计算方法具有高度适用性。 |
| 英文摘要: |
| The rapid development of digital informatization has provided favorable conditions for the analysis of splitting grouting mechanism. Numerical calculation, theoretical analysis, and model experiments together constitute the mainstream methods for engineering science problems. Based on Biot consolidation theory and two-phase flow theory, the stress-strain and fluid pressure of the sand layer were calculated. The fluid volume method (VOF) was used to track the slurry water interface and perform finite element calculations on the splitting grouting law of low-permeability dense sand layers. Calculations show that in the initial stage, the energy of the slurry is relatively small, and the splitting expansion is extremely limited. When the grouting pressure reaches 2MPa, the splitting cracks gradually form, expand, and penetrate, and the splitting slurry veins are initially formed. When the grouting pressure reaches 3MPa, the length of the grout vein continues to extend and the width continues to expand. As the compactness of the sand layer increases, the mechanical properties such as compression modulus and stiffness of the sand layer significantly improve, and the difficulty of splitting grouting gradually increases; As the viscosity of the slurry increases, the frictional resistance during the diffusion process of the slurry continues to increase, and the splitting grouting effect gradually deteriorates. Under the action of grouting pressure, a network of intersecting grout veins is generated in the sand layer, which play a role in "reinforcement" and skeleton support, significantly improving the overall mechanical properties of the sand layer. The on-site measurement and numerical calculation of Qingdao Metro are consistent, indicating that the finite element calculation method in this paper has high applicability. |
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