软土固化材料结合高压喷射工法在隧道施工中的应用研究  

STUDY ON APPLICATION OF SOFT SOIL REINFORCEMENT MATERIAL AND JET GROUTING IN TUNNEL CONSTRUCTION

作　　者：朱菲霞 ZHU Fei-xia(China Railway 18th Bureau Group Fifth Engineering Co.,Ltd.,300459,Tianjin,China)

机构地区：[1]中铁十八局集团第五工程有限公司,天津300459

出　　处：《建筑技术》2025年第4期464-467,共4页Architecture Technology

摘　　要：为了提高软土固化材料对淤泥质土的加固效果,以矿渣、电石渣、水泥为原材料,通过碱激发的方式制备了一种新型软土固化材料。采用无侧限抗压强度试验研究了固化土的强度,利用微观分析手段对固化土进行了微观结构表征,并选取最优组合进行了高压喷射工法的现场试验。结果表明:矿渣、电石渣与Na_(2)SO_(4)的组合最佳,28 d抗压强度达到1.3 MPa,180 d抗压强度达到最大值2.1 MPa;通过分析各体系孔隙率,在碱度相对较高的情况下体系产生的孔隙率较低;扫描电子显微镜显示矿渣、电石渣与Na_(2)SO_(4)体系在产生硅酸钙的同时,也产生了大量的钙矾石,增强了体系强度;通过高压喷射现场取芯试验结果表明,矿渣、电石渣与Na_(2)SO_(4)体系的最小抗压强度为0.9 MPa,满足设计要求。该研究结果可为我国沿海淤泥质土的加固提供参考。In order to improve the reinforcement effect of soft soil reinforcement materials on silty soil,a new type of soft soil reinforcement material was prepared by alkali activation,with mineral slag,carbide slag and cement as raw materials.The intensity of soil reinforcement was studied by unconfined compressive strength testing,the microstructure of reinforced soil was characterized by means of microscopic analysis and jet grouting was tested on site with an optimal combination.Results showed that the combination of mineral slag,carbide slag and Na_(2)SO_(4) had the best performance,with the 28d compressive strength of 1.3 MPa and 180d maximum compressive strength of 2.1 MPa;the porosity of each type was analyzed,which was low at high alkalinity.SEM showed that the combination of mineral slag,carbide slag and Na_(2)SO_(4) produced calcium silicate as well as a large amount of ettringite,with higher intensity.On-site core sampling testing of jet grouting showed that the combination of mineral slag,carbide slag and Na_(2)SO_(4) had the minimum compressive strength of 0.9 MPa,conforming to the design requirements.Results of this study provide a reference for reinforcement of coastal silty soil in China.

关 键 词：软土固化材料 高压喷射 微观分析 隧道加固 

分 类 号：TU528.01[建筑科学—建筑技术科学]