Development and infiltration behavior of environmental polymer slurry for slurry shield tunneling

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作   者：

Dalong Jin;  Yidong Guo;  Dajun Yuan;  Dingwei Zhang;  Sijin Liu; 

作者机构：

China||School of Civil Engineering;  Beijing Jiaotong University;  Key Laboratory of Urban Underground Engineering of the Education Ministry;  China Railway 14th Corporation Mega Shield Construction Engineering Co. Ltd.;  Beijing 100044;  Nanjing 211800;  China; 

关键词：

Slurry shield;  Cross-linked polyacrylamide (HPAM);  Orthogonal experiment;  Environmental polymer slurry;  Infiltration test;  Filter cake; 

期刊名称：

Construction and Building Materials

i s s n：

0950-0618

年卷期：

2025 年 460 卷 Jan.24 期

页   码：

139781.1-139781.11

页   码：

摘   要：

With the promotion of the green development and low carbon concept, there is a need to find more efficient, degradable and eco-friendly alternatives to slurry. In this study, a novel polymer slurry of HPAM slurry was developed, and the microscopic structure of novel polymer slurry and viscosity improving mechanism were revealed through the electrochemical reaction analysis. The basic physical properties were investigated, and a suitable and optimal mixing proportion of the HPAM slurry was determined using orthogonal experiments of 9 factors and 4 levels. Besides, the infiltration tests of novel polymer slurry into saturated sand were carried out using self-developed slurry infiltration device, the results indicated that the novel polymer slurry can form a flat and dense filter cake and short infiltration zone, and has the advantages of fast filter cake forming rate, high filter cake quality and excellent support effect compared to the traditional bentonite slurry, indicating the excellent air-tightness and pressure maintaining performances of novel polymer slurry. Meanwhile, the novel polymer slurry can reduce the amount of bentonite used by 67 %. This is attributed to the fact that the new polymer slurry can fully fill the pores between the sand particles in the stratum, establishing a spatial network structure between the sand particles, which indicated the engineering applicability of this slurry. The findings in this paper could offer guidance for the preparation and selection of the eco-friendly slurry used in slurry shield in the future.