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为了揭示盐水环境下水泥土桩的劣化效应及其对道路复合地基沉降的影响,通过室内模型试验研究了黄河三角洲盐水环境下水泥土的劣化效应,分析了水泥土劣化深度和未劣化部分抗压强度的演化规律。通过对已有水泥土劣化研究成果进行总结分析,提出了基于水泥土早期强度试验的盐水环境下水泥土桩全寿命周期承载力实用预测方法;同时,通过模型试验和数值模拟研究了水泥土桩劣化对复合地基沉降的影响。研究结果表明:在加固地下水矿化度高的软弱地基时,水泥土桩会从外向内逐渐劣化;水泥土劣化对搅拌桩承载力的影响较大,会增大复合地基沉降,而且桩体缺陷将加剧水泥土桩的劣化效应。为了保证路基的持久稳定并控制其长期沉降,在盐水环境下水泥土桩复合地基设计中须考虑水泥土劣化的影响。
In order to reveal the deteriorating effect of cement-soil pile under salt water environment and its effect on settlement of road composite foundation, the degradation effect of cement-soil in salt water environment of the Yellow River Delta was studied by indoor model test. The degradation depth of cement soil and uncompressed part of compressive strength Evolutionary law. Based on the summarization and analysis of the existing research results of cement soil degradation, a practical prediction method based on the early strength test of cement soil is put forward. In the meantime, through model test and numerical simulation, Impact on composite foundation settlement. The results show that cement-soil piles will gradually deteriorate from the outside to the inside when the soft ground with high salinity of groundwater is being strengthened, and the influence of cement-soil degradation on the bearing capacity of the mixing piles will be greater, which will increase the settlement of the composite foundation, Will aggravate the deterioration effect of cement-soil pile. In order to ensure the long-term stability of subgrade and control its long-term settlement, the influence of cement soil deterioration must be considered in the design of cement-soil pile composite foundation in salt water environment.