格栅加筋废弃钢渣的强度特性试验研究

提出了格栅加筋废弃钢渣的土工回填新技术,通过三轴固结排水试验研究格栅加筋废弃钢渣的抗剪强度特性。以玄武岩纤维格栅和江苏永钢废弃钢渣为例,分析在不同相对密实度、格栅加筋层数和围压下的格栅加筋废弃钢渣的应力应变特性,将格栅加筋废弃钢渣的抗剪强度特性与传统土、特殊土的抗剪强度特性以及前人研究的格栅或格室加筋特殊土的抗剪强度特性进行了比较。结果表明:各工况下的格栅加筋钢渣的黏聚力强度都远大于传统土类,且内摩擦强度也较高,达到砂类的摩擦强度;各工况下的格栅加筋钢渣的黏聚力强度弱于黄土与膨胀土,但其内摩擦强度则高于膨胀土与黄土。表明格栅加筋钢渣在较多工况下比传统土、特殊土以及格栅或格室加筋特殊土拥有更高的抗剪强度特性,可替换砂土应用于软基处理或加筋回填工程中。

Experimental Study on Shear Strength Characteristics of Geogrid Reinforced Waste Steel Slag

The geogrid reinforced waste steel slag is a new technique for foundation backfill proposed by authors. The shear strength characteristics of geogrid reinforced waste steel slag were studied through triaxial consolidation and drainage tests. Taking basalt fiber geogrid and abandoned steel slags from Jiangsu Yonggang Company as an example, the stress-strain characteristics of geogrid reinforced waste steel slag of different relative densities, with different geogrid layers and under different confining pressure were analyzed. The reinforced effect of different reinforcement schemes was analyzed and the shear strength characteristics of geogrid reinforced waste steel slag were compared with traditional soil, special soil, and geogrid or lattice reinforced special soil studied by predecessors. It can be seen that the cohesive strength is far greater for geogrid reinforced steel slag than traditional soil under various working conditions. The internal friction strength is also higher, reaching the friction strength of sand. The cohesive strength of geogrid reinforced steel slag is lower than that of loess and expansive soil under each working condition, but the internal friction strength is higher. Therefore, it can be concluded that the shear strength of geogrid reinforced steel slag is higher than that of traditional soil, special soil, geogrid reinforced special soil and geocell-reinforced reinforced special soil under many conditions. Thus, the geogrid reinforced steel slag could be used in soft soil foundation treatment or reinforced engineering backfill.