掺入秸秆纤维对固化高含水率淤泥黏滞特性影响研究

黏滞性是影响高含水率疏浚淤泥固化施工的重要工程特性。向高含水率疏浚淤泥流动固化土中添加秸秆纤维,开展黏滞度试验,探讨不同纤维掺量下淤泥流动固化土的黏滞特性。试验结果表明:相同剪切速率下,纤维掺量小于3%时,淤泥流动固化土剪切应力基本不受掺量增加的影响;纤维掺量≥3%时,剪切应力随掺量增加而降低。淤泥流动固化土动切力随秸秆纤维掺量增加而缓慢降低;黏滞系数随秸秆纤维掺量增加呈现先缓慢降低之后快速上升的变化规律。不同剪切速率下,淤泥流动固化土黏度随秸秆纤维掺量增加而缓慢降低。

Study on the Effect of Straw Fiber on the Viscosity Characteristics of Solidified Silt with High Moisture Content

Viscosity is an important engineering characteristic affecting the solidification construction of dredged silt with high moisture content. Straw fiber was added to the dredged silt flowing solidified soil with high water content, and the viscosity test was carried out to explore the viscosity characteristics of the silt flowing solidified soil with different fiber content. The test results show that the shear stress of silt flow solidified soil is basically not affected by the increase of fiber content when the fiber content is less than 3% at the same shear rate. When the fiber content is greater than or equal to 3%, the shear stress decreases with the increase of fiber content. The dynamic shear force of silt flow solidified soil decreases slowly with the increase of straw fiber content. The viscosity coefficient decreased slowly at first and then increased rapidly with the increase of straw fiber content. Under different shear rates, the viscosity of silt flow solidified soil decreased slowly with the increase of straw fiber content.