软土电化学桩加固室内模型试验研究

LABORATORY MODEL TEST STUDY OF ELECTROCHEMICAL STABILIZATION IN SOFT SOIL

利用自行研制的一套软土电化学成桩加固的室内模型试验装置,开展系统的模型试验,成功再现铁质胶结成桩加固的整个物理化学过程,弄清胶结桩体组成结构特征,并通过加固土体电流、电阻、盐度的跟踪监测,探讨电化学成桩加固的电解特性及主要控制参数。在此基础上,开展微型贯入试验、室内平板载荷试验、崩解试验,对胶结桩体强度分布规律、承载力特性和水稳性进行研究。研究结果表明,电化学胶结桩范围为电极直径的8～12倍,强度随与电极距离的增大而逐渐减小,胶结核心层和影响层组成之间存在一明显的强度突变面,胶结桩–土复合地基的承载力和变形模量较加固前提高约10倍,并具有很好的水稳性。

A set of laboratory model test equipment for electrochemical reinforcement of soft soil is designed to carry out a chain of model tests, the whole physical and chemical processes of ferruginous cemented piles are reconstructed, and structural features of cement piles are clarified. The electrochemical characteristics and the main control parameters of the electrolytic reinforcement in the pile are discussed through tracking and monitoring of current, resistance and salinity of the reinforced soil. On this base, the research on the strengthen distribution law, load capacity property and water stability is made though the micro-penetration test, indoor plate loading test and disintegration test. The results show that, the ranges of ferruginous cemented piles are respectively 8 times and 12 times thickness of electrode diameter. The strength of cemented soil is inversely proportional to the diameter distance of electrode. There is strong discontinuous surface between the coral layer and the affected layer. The cemented ground load force and the deformation modulus are 10 times better than the former, and it has good water stability.