Deformation and mechanical properties of backfill grouting material directly affect soil stress release, ground subsidence and late stress situation of segment lining. Based on triaxial test method of non-independent material, we take the rigid slurry and inert slurry as research objects, carrying out consolidated non-drained triaxial shear test. Results show that, 1) high confining pressure contributes to the consolidation and drainage of the slurry, and the ultimate volumetric strain of the slurry increase with confining pressure; 2) in the shearing process on the non-drained condition, slurry shows tendency of strain hardening, and the volume shrinks first, then with obvious shear dilatation. On the premise of deformation and construction requirements, we can suitably increase grouting pressure and use slurry with smaller water-glue ratio to ensure the construction quality of grouting body.
Key words
shield /
backfill grouting /
triaxial test /
shear stress /
pore pressure dissipation /
volume strain
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References
[1] 孙 闯, 张建俊, 刘家顺, 等. 盾构隧道壁后注浆压力对地表沉降的影响分析[J]. 长江科学院院报, 2012, 29(11): 68-72.
[2] 王 杰,杜嘉鸿.岩土注浆技术的理论探讨[J]. 长江科学院院报, 2000, 17(6): 82-86.
[3] 范昭平, 韩月旺, 方忠强. 盾构壁后注浆压力分布计算模型[J]. 公路交通科技, 2011,28 (3): 95-100.
[4] 李晓鄂, 王树清. 高压喷射注浆固结体性能研究[J]. 长江科学院院报, 2002, 19(增1): 68-70.
[5]MCGILLIVRAY R T. Design of Grouting Procedures to Prevent Ground Subsidence over Shallow Tunnels[C]∥American Society of Civil Engineers.Proceedings of the Third International Conference on Grouting and Ground Treatment,New Orleans, Louisiana ,February 10-12, 2003: 1557-1569.
[6] 王树清, 蔡胜华, 蒋硕忠. 盾构法隧道施工同步注浆材料研究[J]. 长江科学院院报, 1998, 15(4): 29-31,39.
[7] BEZUIJEN A, TALMON A M, KAALBERG F J, et al. Field Measurements of Grout Pressures During Tunnelling of the Sophia Rail Tunnel[J]. Soils and Foundations, 2004, 44(1): 39-48.
[8] 张海涛. 盾构同步注浆材料试验及隧道上浮控制技术[D]. 上海: 同济大学, 2007.
[9] 韩月旺, 钟小春, 虞兴福. 盾构壁后注浆体变形及压力消散特性试验研究[J]. 地下空间与工程学报, 2007, (6): 1142-1147,1175.
[10]朱建春, 李 乐, 杜文库. 北京地铁盾构同步注浆及其材料研究[J]. 建筑机械化, 2004, (11): 26-29.
[11]罗云峰, 区 希, 张厚美, 等. 地铁隧道盾构法同步注浆用水泥砂浆的试验研究[J]. 混凝土, 2004, (8): 72-75.
[12]ZHU W, WANG R, ZUO J, et al. Improved Isotropically Consolidated Undrained Triaxial Test Method for Non-Self-Supporting Materials[J]. Geotechnical Testing Journal, 2014, 37(4): 1-11.
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