关键词: 隧道工程, 盾构渣土, 同步注浆料, 稻壳灰, 性能试验

Abstract: In order to lower of cost and minimize the impact on urban environment caused by shield muck transportation and accumulation, and to achieve the recycling of solid waste, the synchronous grouting material was prepared by using shield muck to replace overall sand and rice husk ash(RHA) to replace part of cement, and the related properties of prepared slurry were analyzed. The results show that: (1) The addition of RHA has great influence on consistency and setting time, i. e., the higher the content of RHA, the smaller the consistency and setting time. (2) When the RHA replacement rate is 25%, the consistency is reduced by 27.5%, and the setting time is shortened by 31.5%; the strength of grouting material decreases first and then increases with RHA content increasing; the strength of grouting material at 28 d is not lower than that of grouting material without RHA. (3) With the increase of muck particle size, the consistency and setting time of grouting material decrease, while the strength of grouting material increases. The experiment determined the ratio of grouting material: water-binder ratio 2.5, RHA content 25%, and muck particle size 2.36-9.5 mm, which not only improved the consistency of grouting material (105 mm), but also significantly increased the strength (3.35 MPa). The indices of grouting material met the requirements, providing a new idea for the reuse of residue in shield tunneling.

Key words: tunnel engineering, shield muck, synchronous grouting material, rice husk ash, performance test