重粉质壤土泥浆特性动态检测

[目的]为用含粘粒量高的土修建水坠坝提供基础资料和理论指导。[方法]以陕西白水县西武村附近大沟流域的土作为试验对象,用等高等直径的PVC管样桶组建测试模型,对2种灌浆速度(15和25 cm/d)下灌浆体的沉降量、抗剪强度、湿密度、下渗量等指标进行动态测定。[结果]不同灌浆速度下,灌浆过程中灌浆体各指标的总体变化趋势相同。对于同一高度的灌浆体,其沉陷变形、抗剪强度、湿密度均表现为灌浆速度大则相应的值大。灌浆5~6 d以后,以25 cm/d速度灌浆的日排水量小于以15 cm/d速度灌浆的日排水量。[结论]灌浆速度加大可缩短达到相同沉陷变形、抗剪强度和湿密度的时间,可明显增加灌浆初期排水量,但随灌浆时间的累积,下层灌浆体接近不透水层而不利于灌浆后期的排水。

Dynamic Monitoring on the Mud of Heavy Silt Loam

[Objective] The research aimed to provide basic files and theoretical guidance for constructing sluicing-siltation dam using soil with high clay content soil.[Method] The soils of Dagou basin near Xiwu Village of Baishui County,Shaanxi Province were taken as experimental materials.PVC pipes with same height and diameter were used to construct testing model for dynamically determining settlement,shear strength,wet density of grouting bulk under 2 different grouting speeds(15 and 25 cm/d).[Result] Under different grouting speeds,general change trend was similar during grouting course.The subsidence,deformation,shear strength and wet density increased with the increase of grouting speed.Five or six days after grouting,daily displacement under 25 cm/d grouting speed was fewer than that under 15 cm/d grouting speed.[Conclusion] The increase of grouting speed could shorten the time for reaching the same subsidence,deformation,shear strength and wet density and increased displacement at the initial stage of grouting,however,with the increase of grouting time,lower grouting bulk was bad for displacement at later grouting period because it was near impermeable layer.