Study on the Mobility and Permeability Characteristics of Suspension-Type Grouts in Soils.

通过理论研究和试验研究，对广泛应用于地基加固工程的悬浮型注浆的可注入性进行了研究。首先，基于Kozeny-Carman分析，推导了具有屈服应力的多孔介质性质与非牛顿流体力学性质之间的基本关系；并提出了一种测定渗透率的方法。结果表明，具有屈服应力的非牛顿流体的渗透率取决于流体中的水力梯度，流动方程的最终形式是非线性的。其次，通过旋转粘度计试验和室内注浆试验，研究了不同类型悬浮液在土体中的流动性和渗透特性。结合土体和浆液的物理特性和水力学特性，详细分析了渗流开始时的临界压力梯度和渗透区孔隙压力分布；这些检验的结果与先前理论研究的结果相吻合。结果表明，该方法能有效地评价悬浮型注浆的渗透能力和最大可能渗透距离。

Injectability of the suspension-type grouts which widely used for improving foundations was studied through theoretical and experimental investigations. First, the fundamental relationships between the properties of porous medium and the hydrodynamic properties of non-Newtonian fluids with a yield stress were derived on the basis of a Kozeny-Carman analysis ; and a method for determining the permeability was developed. It was shown that the permeabilities of non-Newtonian fluids with a yield stress are dependent on the hydraulic gradient in the fluid, and the final forms of the flow equations are nonlinear. Second, the rotational viscometer tests and the labolatory grouting experiments were carried out for different kinds of suspention-type grouts to investigate the mobility and the permeability characteristics in soils. The critical pressure gradient at the onset of flow and the pore-pressure distribution in the penetration zone were examined in detail in conjunction with the physical and the hydromechanical properties of the soil and the grout ; and the results of these examinations coincided with the results of the theoretical investigations developed previously. It is concluded that the penetrability and the maximum possible distance of penetration of the suspension-type grouts are effectively evaluated based on the proposed approach.