水利工程中土体加固的快硬型浆液模型试验研究

Study on Model Test of Fast Hardening Grout for Soil Reinforcement in Hydraulic Engineering

采用灌浆技术对土坝、岸堤进行加固不仅可增强主体结构的强度,还可提升其整体性和稳定性,而灌浆施工的可靠性会严重影响主体工程质量。为此,制取一种快硬型水工沥青混合浆液,并通过对比试验确定了该灌浆液各组成材质的用量;然后针对该快硬型浆液分别采用槽—孔模型、平面模型、一维模型和碎片模型研究了浆液渗入土体单元的特性,以考虑实际工程的不同边界条件,对试验结果根据模型试验比尺换算后,发现各试验数据表现出很好的收敛性;最后采用线性回归方法对试验数据进行拟合分析,发现该快硬型浆液的渗透性(用渗透深度表征)与其温度之间存在高度的正比例关系。据此,可估算出特定温度下该快硬型浆液的渗透深度,也可根据设计的渗透深度,反算出施工时应该将浆液加热到的温度。

In recent years,more and more applications have been made in the reinforcement of earth dam and bank soil with grouting technology in water conservancy projects,which can not only enhance the strength of the main structure,but also improve its integrity and stability,and the reliability of grouting construction will seriously affect the quality of the main project.In this paper,the preparation scheme of a kind of quick-hardening hydraulic asphalt mixture slurry is described firstly,and the amount of material of each group of the slurry is determined by comparative test.Then,the characteristics of the slurry infiltrating into the soil element are studied by using the slot-hole model,the plane model,the one-dimensional model and the debris model.Considering different boundary conditions of the actual project and converting the experimental results with the model scale,it is found that the experimental data show good convergence.Further fitting analysis of the test data by linear regression method shows that the permeability of the quick-hardening slurry(characterized by the depth of penetration)is directly proportional to its temperature.Accordingly,the penetration depth of the quick-hardening slurry can be estimated at a specific temperature,and the temperature to which the slurry should be heated during construction can also be calculated reversely according to the designed penetration depth.