复掺钢渣和矿渣的双液注浆材料加固砂土效果研究

Study on sand solidification effect by dual-liquid grouting material mixed with steel slag and ground slag

为分析双液注浆复合材料对砂土的固化效果,通过无侧限抗压强度试验研究了材料种类、水玻璃体积掺量、砂土含水率、水灰比、浆液用量等5种因素对砂土固结体抗压强度的影响规律。试验结果表明:当水泥掺量为40%、钢渣和矿渣掺量为60%时,复掺钢渣和矿渣的水泥-水玻璃浆液对砂土的固化效果最为显著;在不同含水率的砂土中,水玻璃的最佳体积掺量有所不同,实际工程中应根据不同地质条件确定水玻璃的体积掺量;水灰比在0.7~1.0范围内时,浆液对砂土具有更佳的加固效果;浆液用量是对砂土固结体强度影响最大的因素,浆液用量和养护龄期分别与固结体强度呈线性及幂函数关系。

In order to analyze the solidification effect of dual-liquid grouting composite material on sandy soil,the influence of five factors,such as material type,water glass volume content,sand water content,water cement ratio and slurry dosage,on the compressive strength of sand consolidation body was studied.The test results showed that when the cement content is 40%and the steel slag and ground slag content is 60%,the cement-water glass slurry mixed with steel slag and ground slag has a significant curing effect on sand.For sand smaples with different water contents,the optimum volume fraction of water glass is different,and the volume fraction of water glass should be determined according to different geological conditions in practical engineering.When the water-cement ratio is in the range of 0.7~1.0,the slurry has better reinforcement effect on sand.Slurry dosage is the most influential factor on the strength of sand consolidation,and the slurry dosage and curing age have linear and power function relationship with consolidation strength respectively.