Li Zhenhua, Zhu Zihao, Zhao Yahong, Zeng Cong, Zhang Peng
Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China.
Guangdong GDH Water Co., Ltd., Shenzhen 518000, China.
Polymers (Basel). 2022 Sep 2;14(17):3635. doi: 10.3390/polym14173635.
Polymer slurry is widely used in underground engineering treatment, but due to the concealed nature of underground projects, the diffusion pattern of slurry in the sand has been little studied. In this study, the basic physical properties of water-based polyurethane, oil-based polyurethane, and acrylate and epoxy resin were compared, and the performance of chemical grouted sands with different polymer slurry/sand mass ratios (PS/S) was tested. The higher the PS/S, the better the mechanical and impermeability properties of the chemical grouted sands. In this paper, water-based polyurethane was selected to carry out orthogonal tests on the diffusivity of slurry in sands. This experiment investigated the degree of influence of sand quality, grouting pressure and sand compactness on the diffusion of slurry in sands. The test results show that, in terms of factors affecting the final pressure of grouting, the sand density has the greatest influence, followed by the sand quality, and the grouting pressure is the smallest. In terms of slurry diffusibility, grouting pressure has the greatest influence, followed by sand compactness, and the sand quality is the smallest. The diffusion mechanism of slurry in the sand was deduced from the morphology of chemical grouted sands. Water-based polyurethane showed splitting-compression-penetration diffusion in sands of different grades, and the diffusion pattern of the slurry was not the same in low-pressure (1-1.5 MPa) grouting and high-pressure (2 MPa) grouting, and lateral splitting occurred in the case of high-pressure grouting diffusion.
聚合物浆液在地下工程处理中应用广泛，但由于地下工程的隐蔽性，浆液在砂土中的扩散规律鲜有研究。本研究对比了水性聚氨酯、油性聚氨酯、丙烯酸酯和环氧树脂的基本物理性能，并测试了不同聚合物浆液/砂质量比（PS/S）下化学注浆砂的性能。PS/S越高，化学注浆砂的力学性能和抗渗性能越好。本文选用水性聚氨酯对浆液在砂土中的扩散率进行正交试验。该实验研究了砂质、注浆压力和砂的密实度对浆液在砂土中扩散的影响程度。试验结果表明，在影响注浆终压的因素方面，砂的密度影响最大，其次是砂质，注浆压力影响最小。在浆液扩散性方面，注浆压力影响最大，其次是砂的密实度，砂质影响最小。从化学注浆砂的形态推导出浆液在砂土中的扩散机理。水性聚氨酯在不同级配的砂土中呈现劈裂-压缩-渗透扩散, 且在低压（1 - 1.5MPa）注浆和高压（2MPa）注浆情况下，浆液的扩散模式不同，高压注浆扩散时会发生侧向劈裂。
