Permeation grouting diffusion mechanism of quick setting grout
Permeation grouting diffusion mechanism of quick setting grout
复制标题
速凝浆液渗透注浆扩散机理
DOI：
10.1016/j.tust.2022.104449
复制
发表时间：
2022-03-10
影响因子：
6.9
通讯作者：
Chu, Yuntian
中科院分区：
文献类型：
--
作者：
Zhang, Lianzhen;Yu, Rangang;Chu, Yuntian
在渗透灌浆工程中采用速凝浆液，可以有效控制浆液扩散范围，减少浆液浪费。由于双组分注浆方法和浆液的速凝特性，使得速凝浆液的粘度在注浆区域内分布不均匀，对浆液扩散过程有重要影响。研究了一种速凝浆液的渗透灌浆过程。考虑浆液粘度的非均匀分布，建立了二维圆柱形渗透注浆扩散模型。设计并建立了可视化渗透注浆扩散模拟试验系统。为验证理论模型的正确性，采用了两种水灰比（W/C = 1，2）的水泥-水玻璃浆液和两种粒径范围（2-5 mm，5-20 mm）的碎石砂进行了一系列试验。结果表明：（1）当砂层中孔隙空间的大小超过一定值时，浆液的渗透扩散完全受浆液重力的控制，速凝特性的影响可以忽略不计。另外，速凝特性对渗透扩散的影响最大。(2)计算结果与试验结果吻合较好。在相同的终喷压力下，计算出的喷射压力是实验值的1.0-1.4倍，计算出的扩散半径是实验值的95.7%~ 98.5%。(3)在速凝浆液渗透灌浆过程的计算中，必须考虑浆液粘度的非均匀分布。对于速凝浆液，若不考虑浆液粘度的非均匀分布，则注入压力将高估实际值10倍以上，扩散半径将低估实际值30%~ 50%。
Quick setting grout is used in permeation grouting projects to control the grouting diffusion range effectively and reduce the waste of grout. Owing to the double-component injection method and quick setting property of the grout, the viscosity of the quick setting grout is non-uniformly distributed in the grouted region, which has a significant influence on the grouting diffusion process. In this study, the permeation grouting process of a quick setting grout was studied. A 2-D cylindrical permeation grouting diffusion model was developed considering the non-uniform distribution of grout viscosity. A visible permeation grouting diffusion simulation test system was designed and established. A series of tests were carried out to verify the correctness of the theoretical model, in which cement-sodium silicate grout, a typical quick setting grout, with two water-cement ratios (W/C = 1, 2) and gravel sand with two different ranges of particle size (2-5 mm, 5-20 mm) were used. The results show that (1) when the size of the void space in the sand stratum exceeds a certain value, the permeation diffusion of grout is completely controlled by grout gravity, and the influence of the quick setting characteristics can be ignored. Otherwise, the quick setting characteristics have the most important effect on permeation diffusion. (2) The calculated results agree well with the test results. The calculated injection pressure result is 1.0-1.4 times the experimental result, and the calculated diffusion radius is 95.7% -98.5% of the test value with the same final injection pressure. (3) It is necessary to consider the non-uniform distribution of viscosity in the calculation of the permeation grouting process of a quick setting grout. For a quick setting grout, if the non-uniform distribution of viscosity is not considered, the injection pressure would be overestimated by more than 10 times the actual value, and the diffusion radius would be underestimated by 30%-50% of the actual value.