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采用注浆模拟试验及理论分析研究了围岩性质对于注浆压力变化规律及浆液扩散模式的影响。试验采用在注浆模型架内分区充填不同孔隙比土体的方法模拟被注围岩显著的向异性及非均质性;采用多个注浆管依次注浆的方法模拟实际注浆工程中的不同注浆施工阶段。通过开挖揭露浆脉(浆泡)特征研究围岩性质对于浆液扩散形式的影响;通过分析注浆过程中注浆压力数据研究围岩性质对于注浆压力的影响;通过对注浆前后围岩试样进行室内试验测试,获取注浆对于围岩孔隙比及压缩系数的影响规律。研究结果证实:注浆压力变化规律及浆液扩散模式与围岩性质密切相关,通过分析注浆压力变化规律与浆液扩散模式可判定围岩性质,从而为注浆施工过程中的注浆参数动态调整提供依据。相关研究结论在永莲隧道帷幕注浆工程中进行了现场试验,进一步验证了其正确性。
Using grouting simulation test and theoretical analysis, the influence of surrounding rock properties on grouting pressure variation and slurry diffusion model was studied. In the experiment, different anisotropy and heterogeneity of surrounding rocks were simulated by grouting different grouting zones in the grouting model, and grouting method was used to simulate the actual grouting Different grouting construction stage. Through the excavation and revelation of the characteristics of slurry (slurry), the influence of the properties of surrounding rock on the dispersion of slurry was studied. The influence of the properties of surrounding rock on grouting pressure was analyzed by analyzing the grouting pressure data during grouting. The samples were tested in the laboratory and the influence of grouting on the void ratio and compressibility of surrounding rock was obtained. The results of the study confirm that the variation of grouting pressure and the slurry diffusion model are closely related to the properties of the surrounding rock. The properties of the surrounding rock can be judged by analyzing the variation law of grouting pressure and the slurry diffusion model, so as to dynamically adjust the grouting parameters during the grouting construction Provide evidence. Related research conclusions In the Yonglian tunnel curtain grouting project conducted a field test, to further verify its correctness.