基于速凝浆液流–固相变特性的裂隙岩体注浆扩散机制

doi:10.13722/j.cnki.jrme.2023.0736

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摘要速凝类浆液流–固相变特性对裂隙岩体注浆扩散过程具有显著影响。为揭示速凝浆液裂隙岩体注浆扩散机制，以水泥–水玻璃浆液(C-S浆液)作为典型速凝浆液，提出采用基于屈服应力、黏度均随时间变化的Bingham流变本构模型描述速凝浆液流–固相变特性，并通过室内试验获得C-S浆液的屈服应力、黏度时变方程，在此基础上建立速凝浆液裂隙注浆扩散过程理论模型。开展恒定注浆速率下的C-S浆液裂隙注浆模拟试验，获得注浆压力–时间关系与浆液压力空间分布情况，并对理论计算结果进行正确性验证，揭示速凝浆液屈服应力与黏度的时空分布特征，以及静水阻力、流体相阻力、固体相阻力三者在注浆扩散过程中的变化规律。研究结果表明：在C∶S体积比为1∶1，2∶1，3∶1三种工况下，C-S浆液的剪切应力–剪切速率关系均符合Bingham流变本构关系模型，随着C∶S体积比的增加，浆液流–固相变起始时间与结束时间均显著缩短，浆液屈服应力与黏度峰值均显著增加；相比试验结果，基于屈服应力与黏度均随时间变化的Bingham模型、屈服应力固定的Bingham模型、Newton模型的注浆压力计算结果最大误差分别为12.73%～19.62%，20.12%～29.44%，21.84%～31.35%，说明前1种模型优于后2种模型；在整个裂隙注浆扩散过程中，浆液流体相阻力先由0%快速增加至峰值，然后缓慢下降，固体相阻力在整个注浆扩散过程中一直呈近似线性增加趋势。不同C∶S体积比对注浆结束时刻的流体相阻力占比、固体相阻力占比影响不显著，注浆结束时刻的流体相阻力占比为81.7%～82.9%，固体相阻力占比为15.7%～17.3%。

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关键词 ：岩石力学；速凝浆液；流&ndash, 固相变特性；裂隙注浆；流变本构关系；模拟试验

Abstract：Fluid-solid phase transition characteristics of quick-setting grout has an obvious effect on rock fissure grouting diffusion. With the objective to study rock fissure grouting diffusion mechanism of quick-setting grout，cement- sodium silicate grout(C-S grout) was regarded as the typical quick-setting grout in this paper. Bingham rheological constitutive model with yield stress and viscosity changing with reaction time simultaneously was adopted to describe fluid-solid phase transition characteristics of quick-setting grout. Time-dependent equations of yield stress and viscosity of C-S grout were acquired based on laboratory test. Rock fissure grouting diffusion model of quick-setting grout was established. Rock fissure grouting simulation tests of C-S grout with constant injection rate were done. Injection pressure and spatial distribution of grout pressure in whole grouting process had been acquired. Verification of theorical model had been done based on test results. Temporal and spatial distribution characteristics of grout yield stress and viscosity in grouting region were analyzed. Variation law of calm water resistance，fluid phase resistance and solid phase resistance in grouting diffusion process were acquired. Results show that：Relationship between shearing stress and shearing rate of C-S grout is in good agreement with Bingham rheological constitutive model. With cement to sodium silicate volume ratio increasing，starting and ending time of fluid-solid phase transition shorten significantly. Furthermore，peak value of yield stress and viscosity increase markedly. Contrast to test results，theoretical calculation error of injection pressure based on Bingham model with time-varying yield stress and viscosity，Bingham model with fixed yield stress and Newton model were 12.73%–19.62%，20.12%–29.44% and 21.84%–31.35% respectively. For calculation of rock fissure grouting diffusion process，Bingham model with time-varying yield stress and viscosity is the best model of the three models. In whole grouting process，fluid phase resistance increases rapidly and then decreases slowly. Solid phase resistance increases approximately linearly. C∶S volume ratio has little effect on proportion value of fluid phase resistance and solid phase resistance at ending moment of grouting process，with proportion value of fluid phase resistance and solid phase resistance are 81.7%–82.9% and 15.7%–17.3% respectively.

Key words： rock mechanics quick-setting grout fluid-solid phase transition characteristics rock fissure grouting rheological constitutive relationship simulation test

引用本文:

张连震1，黄长鑫2，张庆松2，裴妍2，李志鹏3，杨文东1，刘军2，王晓晨4. 基于速凝浆液流–固相变特性的裂隙岩体注浆扩散机制[J]. 岩石力学与工程学报, 2024, 43(5): 1190-1203.
ZHANG Lianzhen1，HUANG Changxin2，ZHANG Qingsong2，PEI Yan2，LI Zhipeng3，. Rock fissure grouting diffusion mechanism of quick-setting grout considering fluid-solid phase transition characteristics. , 2024, 43(5): 1190-1203.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0736 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I5/1190

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