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对水泥浆液黏度时变性进行了试验研究,证实了工程常用水灰比范围内水泥浆液服从宾汉姆流体特性;不同水灰比浆液黏度均随注浆时间增大而大幅度增加。根据试验结果,考虑注浆过程中水泥浆液黏度随时间的变化,对盾构壁后注浆水泥浆液的扩散规律及因注浆而造成的管片压力进行了推导及分析。计算表明:相同注浆时间条件下,水泥浆液扩散半径及注浆对管片产生的压力值均随注浆压力的增大而增大。考虑浆液黏度时变性后,扩散半径、注浆对管片压力值等均较不考虑浆液时变性时减小,且随注浆压力的增大,浆液黏度变化对管片压力值的影响更加明显。相同注浆压力条件下,浆液扩散半径及对管片产生的压力值均随注浆时间的增长而增加,但注浆前期增长速度较快,而后逐渐减缓。研究成果对于盾构壁后注浆工艺选择及参数设计具有较大的指导意义。
The viscosity degeneration of cement slurry was studied. It was confirmed that the cement slurry in the range of engineering water-cement ratio obeys Bingham fluid. The viscosity of different water-cement ratio slurry increases with the increase of grouting time. According to the test results, considering the change of viscosity of cement slurry during grouting, the diffusion rules of cement grouting slurry after grouting and the pressure of grout caused by grouting are deduced and analyzed. The results show that under the same grouting time, the grouting radius and grouting pressure increase with the increase of grouting pressure. Considering the denaturation of the slurry viscosity, the diffusion radius, grouting pressure on the tube and so on are less than the denaturation when the slurry is not reduced, and with the grouting pressure increases, the slurry viscosity changes on the tube pressure value more obvious . The same grouting pressure conditions, the slurry diffusion radius and the pressure generated by the tube section with the grouting time increases, but the rapid growth of grouting early, and then gradually slow down. The research results have great guiding significance for the choice of shield grouting technology and parameter design.