摘要
盾尾同步注浆对控制地面沉降和隧道上浮起着关键作用,采用压缩试验、直剪试验、单轴抗压强度试验,对不同成浆方式形成的自制浆和商品浆在不同龄期、不同养护条件的压缩特性、剪切强度特性和单轴抗压强度特性进行了室内试验研究,研究结果表明:商品浆在3d内的压缩模量和抗压强度比自制浆小,在后期,商品浆的抗压强度比自制浆大,商品浆的抗剪强度比自制浆大;商品浆和自制浆的压缩模量、粘聚力、内摩擦角和单轴抗压强度都随时间呈增加趋势,其中浆液的压缩模量和单轴抗压强度增加的较快,粘聚力和内摩擦角增加的较慢;干养浆液要比湿养浆液的强度增长的快,同时更难被压缩;特定压力越大,浆液的压缩量越大,浆液的压缩模量越大,越难被压缩,浆液压缩量与特定压力是成类似对数关系。研究结论不仅对于理论计算中浆液参数的选择具有参考价值,而且对于盾构同步注浆中浆液的选择更具有实际工程意义。
Synchronous grouting of shield tail plays a key role in controlling land subsidence and floating in tunnel.Compression test,direct shear test and uniaxial compressive strength test were used to study the compression characteristics,shear strength characteristics and uniaxial compressive strength characteristics of self-made slurry and commercial slurry in different age and curing conditions.The results indicate as following:the compression modulus and compressive strength of commercial slurry in three days are smaller than that of self-produced slurry,and after that the compressive strength of commercial slurry is greater than that of self-slurry and the shear strength of commercial slurry is greater than that of self-slurry;the compression modulus,cohesive force,internal friction angle and uniaxial compressive strength of commercial slurry and self-slurry all increase with time,and the compression modulus and uniaxial compressive strength of the slurry increase rapidly,while the cohesion and internal friction angle increase slowly;the strength of dry fed slurry increases faster than that of wet fed slurry,and it is more difficult to be compressed;the larger specific pressure leads to the larger compression amount of the slurry,and the larger the compression modulus of the slurry,the more xdifficult it is to be compressed,and the amount of slurry compression has a similar logarithmic relationship to a particular pressure.The research conclusion has reference value not only for the selection of slurry parameters in theoretical calculation,but also for the selection of slurry in shield synchronous grouting.
作者
武亚军
方敬奇
张孟喜
凌宇峰
Wu Yajun;Fang Jingqi;Zhang Mengxi;Ling Yufeng(Department of Civil Engineering,Shanghai University,Shanghai 200072,P.R.China;Shanghai Tunnel Engineering Co.,Ltd.,Shanghai 200032,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2020年第2期366-372,共7页
Chinese Journal of Underground Space and Engineering