淤泥固化知多少？
来源：青州永生环保清淤装备有限公司时间：2020/11/24 16:33:07
土壤固化处理具有悠久的历史，早在几千年前，人类就懂得用石灰和火山灰来固化土壤，以适应生产活动的需要。但是将其作为一门学科来研究，却仅有百余年的历史。淤泥固化处理是指通过在淤泥中加入一定量的外掺剂，改善淤泥土的物理力学性能，以满足不同工程
Soil solidification treatment has a long history. As early as thousands of years ago, people knew how to use lime and volcanic ash to solidify soil to meet the needs of production activities. However, it has only a history of more than a hundred years to study it as a discipline. Silt solidification treatment is to improve the physical and mechanical properties of silt by adding a certain amount of admixture to the silt to meet the needs of different projects.
需要的一门技术，属土壤固化处理范畴。淤泥固化处理以其工艺简单、施工效率高、价格合理等优点，使其在实践中得到广泛的应用。淤泥中加入固化材料后，其物理性能将发生改变，这是因为: 淤泥与固化材料比重不同，有的固化材料比重大于淤泥，有的则相反，两者混合后，改变了淤泥比重；固化材料的加入往往消耗部分水分及有机质，生成新的物质，从而改变淤泥含水率、液塑限及流变性。) 强度。淤泥固化土作为工程填料使用，强度是其主要的指标，现阶段强度研究主要集中在无侧限抗压强度及抗剪强度等参数。由于淤泥具有高含水率、富含有机质等特点，因此对淤泥固化土的强度影响因素的研究，主要集中在初始含水率、有机质、固化材料掺加量等方面。初始含水率较大，淤泥固化土强度降低；有机质大，减小固化土强度，甚至使固化材料失效; 而固化材料的掺入量也是决定性因素，固化材料掺加量不足，固化土无强度，量过大，多余部分则失去作用。变形。淤泥固化土的变形包括受力变形和环境变化引起的变形。受力变形包括无侧限抗压强度的破坏应变，三轴试验中不同围压下固化土的轴向应变以及构件的拉伸变形; 环境变化引起的变形包括不同龄期、不同条件下的体积变形等。
The technology needed belongs to the field of soil solidification treatment. Silt solidification treatment is widely used in practice because of its simple technology, high construction efficiency and reasonable price. When solidified material is added to sludge, its physical properties will change, because: the proportion of sludge and solidified material is different, some solidified material proportion is larger than that of sludge, and some contrary, the proportion of sludge is changed after mixing the two materials; the addition of solidified material often consumes part of water and organic matter to produce new substances, thus changing the moisture content, liquid plastic limit and rheological properties of sludge. 。 Strength. The strength of sludge solidified soil is the most important index when it is used as engineering filling. At present, the strength research mainly focuses on unconfined compressive strength and shear strength. Because of the characteristics of high water content and rich organic matter, the research on the factors influencing the strength of sludge solidified soil mainly focuses on the initial water content, organic matter and the amount of solidified materials. The initial moisture content is higher, the strength of sludge solidified soil decreases; the organic matter is larger, which reduces the strength of solidified soil, even makes the solidified material invalid; and the amount of solidified material is also the decisive factor. The amount of solidified material is insufficient, the solidified soil has no strength, the amount is too large, and the surplus part loses its function. Deformation. Deformation of silt solidified soil includes deformation caused by stress and environmental change. The mechanical deformation includes the failure strain of unconfined compressive strength, the axial strain of solidified soil under different confining pressures and the tensile deformation of components in triaxial tests, and the deformation caused by environmental changes includes the volume deformation at different ages and under different conditions.
淤泥固化土作为各类工程的承载基础或砌筑材料，其耐久性是必须考虑的因素。因其属亲水性胶凝材料，受水影响大，因此应考虑水对耐久性的影响，包括抗渗性、抗冻性以及特殊条件下的抗冲刷性、耐腐蚀性等。淤泥固化土抗渗性往往较好，而抗冻性则较差。在影响淤泥固化土力学性能的因素中，往往对耐久性也有影响，力学性质好，耐久性也
As the bearing foundation or masonry material of various projects, the durability of mud solidified soil is a factor that must be considered. Because it is a kind of hydrophilic cementitious material and is greatly affected by water, the influence of water on durability should be considered, including impermeability, frost resistance, erosion resistance and corrosion resistance under special conditions. The seepage resistance of mud solidified soil is usually better, but the frost resistance is worse. Among the factors affecting the mechanical properties of sludge solidified soil, the durability is often also affected. The mechanical properties are good and the durability is also good.