Test of Thixotropic Slurry Properties and Study of Resistance-Reducing Technology for Pipe Jacking Tunnel Construction
(1 China Railway Tunnel Group Co. Ltd., Luoyang 471000; 2 School of Civil Engineering of Southwest Jiaotong University, Chengdu 610031; 3 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Chengdu 610031)
Abstract：
Based on the Hongzhuanlu jacking pipe tunnel project underneath Zhongzhou Avenue in Zhengzhou
City, we studied the influence of changing contents of materials—including bentonite, CMC, soda ash and PHP—on the properties of a thixotropic slurry, then determined its mix proportions. Furthermore, we also studied the technologies of slurry preparation, grouting equipment selection, grouting parameter design, the arrangement of grouting holes, synchronous grouting and secondary grouting and surface waxing of tunnel elements per the situation of field construction. The theoretical calculation and field testing showed that after applying resistance reducing technologies the values of the maximum jacking force and the average friction resistance coefficient for the vehicle tunnel tube with a large cross section is reduced by 56.3% and 62.3%, respectively, and 56.7% and 60.9% for the non-vehicle tunnel tube with a small cross section, which indicates that these technologies are effective
WANG Ming-Sheng- 1 Liu-Da-Gang- 2,
3
.Test of Thixotropic Slurry Properties and Study of Resistance-Reducing Technology for Pipe Jacking Tunnel Construction[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(6): 182-189
2016, Vol. 53 