固化淤泥土长期强度发展规律与预测模型研究

Solidified Silt Long-term Strength Developing Principle Research Considering the Infleunce of Initial Water Content and Solidification Agents

为研究初始含水率、固化剂种类以及外加腐殖酸对淤泥固化土长期强度的影响,采用堆载预压法降低淤泥初始含水率,以消除传统翻晒烘干法对淤泥赋存腐殖酸的破坏作用。通过无侧限抗压强度试验,分析了180d龄期的固化淤泥土长期强度的发展规律,得到了淤泥固化土的无侧限抗压强度与养护时间之间的线性关系。结果表明,初始含水率和水泥、石灰、腐殖酸、偏高岭土等固化剂对固化淤泥土长期强度发展规律都有显著的影响。偏高岭土的掺入对淤泥固化土初期强度影响不明显,但能明显增强淤泥固化土的后期强度。根据12组不同配比固化淤泥土长期强度数据,引入强度增长因子,建立了固化淤泥土长期强度发展规律预测模型。研究成果可以促进固化淤泥土作为工程填筑的推广应用。

To study the effect of initial water content, curing agent and additional humic acid on long-term strength of compressed sludge, preloading method was used to reduce the water content of sludge. Thus, destructive effect of traditional oven-drying method on humic acid was limited. Development law of long-term strength of compressed sludge under 180 d was analyzed by unconfined compressive test, and the relationship between unconfined compressive strength and curing time was gained. The results show that there is obvious effect of initial water content and curing agent on development law of long-term strength of stabilized sludge. The addition of matekaoline has little effect on initial strength, but apparently increases long-term strength of sludge. According to the results of 12 groups of different proportion, strength growth factor is used to establish prediction model of development law of long-term strength. The results have important significance to promote the application of compressed sludge as filling material in filling project.