压滤泥饼调制泥浆及其在砂层渣土改良中的应用研究

为解决泥水平衡盾构施工中压滤泥饼废弃产生的环保问题，提出一种利用压滤泥饼调制泥浆改良砂层渣土的新方法。从泥浆的密度控制、稳定性控制和粘度控制三个方面，开展压滤泥饼调制泥浆试验，从流动性与渗透性角度，确定改良砂层渣土的适宜泥浆掺量。结果表明：压滤泥饼调制的泥浆密度宜在1.29~1.34 g/cm³之间，掺入泥浆质量3%~5%的钠基膨润土，泥浆具有较高的稳定性和粘度。掺入渣土质量6%~10%的调制泥浆，便能达到与使用纯膨润土改良渣土相近的效果，泥浆用量大为减少。所以利用压滤泥饼调制泥浆并运用于砂层渣土改良是可行的，是一个节能环保的新思路。

Study on the Modulated Mud of Filter Press Mud Cake and Its Application in Soil Conditioning

In order to solve the environmental protection problem caused by the waste of filter press mud cake in the construction of mud-water balance shield, a new method of using filter press mud cake to modulate mud to improve the sand layer and muck was proposed. From the three aspects of mud density control, stability control and viscosity control, the press mud cake preparation mud test was carried out to determine the appropriate mud content for the improved sand and muck from the perspective of fluidity and permeability. The results show that the density of the mud prepared by the filter press mud cake should be between 1.29 g/cm³ to 1.34 g/cm³. Mixed with 3% to 5% sodium bentonite of the mud mass, the mud has high stability and viscosity. Mixed with the residue modulated mud with a mass of 6% to 10% can achieve a similar effect to the use of pure bentonite to improve the muck, and the amount of mud is greatly reduced. Therefore, it is feasible to use the filter press mud cake to modulate the mud and apply it to the improvement of the sand layer and muck, which is a new idea of energy saving and environmental protection.