基于颗粒流的围岩注浆动态过程模拟研究

发布时间：2018-05-27 23:08

本文选题：隧道工程 + 注浆动态模拟　；参考：《铁道工程学报》2017年03期

【摘要】：研究目的:富水地层隧道开挖易发生突水突泥,注浆为一种有效防范措施。本文基于颗粒流离散元方法,研究围岩注浆对富水地层隧道开挖的影响,通过对岩体注浆过程进行细观动态模拟,研究不同注浆压力和注浆孔布设方式下的注浆效果,从而为优化注浆方案提供参考。研究结论:(1)注浆压力的大小决定了最终浆液扩散形式,即注浆压力增大,注浆形式由渗透注浆变成劈裂注浆;(2)通过颗粒流软件模拟出的动态效果及数据分析,验证了劈裂注浆是压密→劈裂→压密→劈裂的动态过程,直至浆液的扩散压力不足以再劈裂围岩颗粒时趋于稳定;(3)多孔同时注浆时浆体很难进入到中心位置;(4)基于本文的研究对象,劈裂注浆的效果优于渗透注浆,考虑过大注浆压力对岩土体的冲击作用,工程应用时可尽量采用起劈压力进行劈裂注浆,且注浆时并不是较多的注浆孔同时注浆就能得到更好的效果,要针对实际地质情况,合理安排注浆孔以及注浆顺序,避免地层薄弱点出现在多孔同时注浆的中心点处;(5)本研究成果可为软弱地层注浆孔的布置原则及注浆质量控制提供参考。
[Abstract]:Objective: water inrush and mud inrush are easy to occur in the excavation of water-rich layer tunnel, and grouting is an effective preventive measure. Based on the discrete element method of particle flow, the influence of surrounding rock grouting on tunnel excavation in water-rich strata is studied. The grouting effect under different grouting pressure and grouting hole layout is studied by dynamic simulation of rock mass grouting process. So as to provide a reference for optimizing the grouting scheme. Conclusion: (1) the size of grouting pressure determines the final form of grouting diffusion, that is, the grouting pressure increases, and the grouting form changes from permeable grouting to split grouting. The dynamic effect and data analysis are simulated by the particle flow software. It is verified that split grouting is a dynamic process of compaction. Until the diffusive pressure of the slurry is not enough to split the surrounding rock particles and tend to be stable / 3 / 3) while grouting is difficult to get to the center of the grouting system, the effect of split grouting is better than that of permeable grouting, based on the research object of this paper, the effect of split grouting is better than that of permeable grouting. Considering the impact of excessive grouting pressure on rock and soil mass, splitting pressure can be used as far as possible for splitting grouting in engineering application, and when grouting is not more than many grouting holes at the same time, a better effect can be obtained, which should be aimed at the actual geological conditions. Reasonable arrangement of grouting holes and grouting sequence to avoid formation weakness at the central point of porous simultaneous grouting can provide a reference for the layout principle and grouting quality control of grouting holes in weak strata.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;天津市市政工程设计研究院;
【基金】：自然科学基金:近断层交通隧道震害机理与结构抗减震适应性研究(51378433);海底盾构隧道全寿命抗震性能研究(51578457)
【分类号】：U455.49

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