水泥硅微粉固化黄土的冻融试验研究

为了研究水泥硅微粉固化黄土的力学性能,利用宁夏宁东工业园区的黄土,掺入2%的水泥和10%的硅微粉进行固化,分别进行7、28 d龄期的三轴试验和28 d龄期3、9次冻融循环的三轴试验。结果表明:7、28 d龄期的素土与7、28 d龄期固化土相比,水泥和硅微粉的掺入对黄土的黏聚力的影响显著。7 d龄期黏聚力增加了33.99倍,28 d龄期黏聚力增加了57.34倍。素土3次冻融循环黏聚力降低了30.3%,9次冻融循环黏聚力降低了88.8%;固化土9次冻融循环黏聚力降低了8.3%,硅微粉和水泥掺入黄土,使其变形表现为素土呈塑性材料特性向固化土呈脆性材料变化,硅微粉和水泥的掺入有效地提高了黄土的承载力。

Experimental Study on Mechanics Characteristics of Solidified Loess with Cement and Silica Micro Powder under Freeze-thaw Cycles

Study on shear strength of solidified loess under freeze-thaw cycles, Ningxia Ningdong industrial park loess,were mixed with 2% cement 10% silica micro powder for solidification, solidified loess shear strength of the 7 d and 28 d age, 28 d age 3 and 9 times of freeze-thaw cycle investigated by tri-axial test, respectively. The results show that 7, 28 d age loess compared with the ages of 7, 28 d age solidified loess, cement and silicon micro powder has significant effects on the cohesion of loess,7 d age cohesion of solidified loess increased 33.99 times, 28 d age cohesion of solidified loess increased 57.34 times.Cohesion of loess was reduced by 30.3% under 3 times of freeze-thaw cycles,cohesion of loess was reduced by 88.8% under 9 times of freeze-thaw cycles. cohesion of solidified loess was reduced by 8.3% under 9 times of freeze-thaw cycles. Silica micro powder and cement mixing loess, the deformation of loess and plastic material properties to the stabilized loess deformation of brittle material, Silica micro powder and cement added to loess effectively improve the load-bearing capacityof loess.