The clay shock method is used to fill the excavation gap caused by shield taper and deviation during shield tunnelling. The rheological properties and diffusion-related performance of clay shock (CS) slurry have an important influence on its ability. In this study, the authors tested the rheological properties of CS slurry by using a rotational viscometer with a stepless regulation in speed. The influence of the parameters of preparation of CS slurry on its rheological properties was analyzed. The results showed that the Bingham plastic model is more suitable for characterizing the shear thinning behaviors of CS slurry. The apparent viscosity and yield stress of the CS slurry first increased and then decreased with increasing duration and speed of stirring. They increased with the duration of standing and decreased with increasing the water–powder ratio of component A. The numerical diffusion simulations and model tests with constant pressure were carried out to investigate the influence of the water–powder ratio of component A, the permeability of the stratum, and the net injection pressure on its diffusion-related performance. The process of diffusion of CS slurry mainly involved filling and permeability diffusion. The filling diffusion stage mainly occurred in the first 30 s of injection and can reach 70–80 % of the final injection mass. The effect degree of the aforementioned factors on the diffusion distance of CS slurry was in the following order: permeability coefficient of stratum > water-powder ratio of component A > net injection pressure. CS slurry diffused over a distance of less than 10 cm in sandy soil, where this was negatively correlated with the viscosity of the slurry and positively correlated with the coefficient of permeability and porosity of the stratum. The filling time of the excavation gap was positively correlated with the viscosity of the slurry, negatively correlated with the net injection pressure, and was not significantly correlated with the coefficient of permeability of the stratum. The diffusion termination time was negatively correlated with the viscosity of the slurry, and positively correlated with the coefficient of permeability of the stratum and the net injection pressure.

中文翻译：

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盾构隧道开挖间隙充填粘土冲击浆流变特性及扩散相关性能试验研究

盾构掘进过程中，采用粘土冲击法填补因盾构锥度、偏斜造成的开挖间隙。粘土冲击（CS）泥浆的流变特性和扩散相关性能对其能力有重要影响。在本研究中，作者使用无级调节速度的旋转粘度计测试了 CS 浆料的流变特性。分析了CS浆料制备参数对其流变性能的影响。结果表明，Bingham塑性模型更适合表征CS浆料的剪切稀化行为。随着搅拌时间和搅拌速度的增加，CS浆料的表观粘度和屈服应力先增大后减小。随静置时间的延长而增大，随A组份水粉比的增加而减小。通过数值扩散模拟和恒压模型试验，研究了A组份水粉比、A组份水粉比的渗透率的影响。地层和净注入压力对其扩散相关性能的影响。CS浆液的扩散过程主要涉及填充和渗透扩散。充填扩散阶段主要发生在注射的前30秒，可达到最终注射质量的70%~80%。上述因素对CS浆液扩散距离的影响大小顺序为：地层渗透系数>A组份水粉比>净注入压力。CS浆液在沙土中的扩散距离小于10 cm，与浆液的粘度呈负相关，与地层的渗透系数和孔隙度呈正相关。开挖间隙充填时间与泥浆粘度呈正相关，与净注入压力呈负相关，与地层渗透系数不显着相关。扩散终止时间与泥浆粘度呈负相关，与地层渗透系数和净注入压力呈正相关。