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即一定模数硅酸钾溶液,是保护加固土遗址的一种无机化学材料。通过近20年的实践证明,PS材料具有增强遗址土体强度和抵抗外界环境破坏的作用。但PS渗透加固遗址土的微观机制以及加固后遗址土宏观特性的改变如何,并没有取得显著的突破和统一的认识。利用3%体积浓度的PS溶液渗透加固室内击实制备的良渚遗址土试样,渗透初始含水率为13%、17%、19%、21%和25%,并对加固前、后试样进行非饱和直剪、压汞和扫描电镜试验,旨在解决上述两个问题。基于压汞试验得到的双峰孔隙分布模型,提出了PS渗透加固遗址土的两种微观加固机制,并通过扫描电镜试验结果验证了加固机制,同时提出了用于表征两种加固机制指标参数P1和P2。通过研究发现,加固指标P1和P2能够较好地描述在不同含水率下经PS加固试样的相关改进特性如土-水特征曲线和剪切特性的变化规律。研究成果为PS的进一步应用和加固保护土遗址研究提供了新的方法和手段。
That is, a certain modulus of potassium silicate solution, is to protect the reinforced soil site of an inorganic chemical materials. After nearly 20 years of practice, PS materials have been shown to enhance the strength of the site soil and resist the damage of the external environment. However, the microscopic mechanism of the soil infiltrated by the PS infiltration reinforcement and the change of the macroscopic characteristics of the soil after the reinforcement have not achieved any significant breakthrough and unified understanding. The samples of Liangzhu site which were prepared by compaction and solidification were infiltrated by 3% volume concentration of PS solution, and the initial moisture content was 13%, 17%, 19%, 21% and 25% Unsaturated direct shear, mercury intrusion and scanning electron microscopy experiments, designed to solve the above two problems. Based on the model of bimodal pore distribution obtained from mercury intrusion experiments, two kinds of microscopic reinforcement mechanisms of PS infiltration reinforced earth are proposed. The strengthening mechanism is verified by scanning electron microscopy. At the same time, And P2. Through the research, it is found that the strengthening indexes P1 and P2 can well describe the changing regularities of the relevant properties of PS-reinforced specimens such as soil-water characteristic curves and shear properties under different water contents. The research results provide a new method and means for the further application of PS and the research on reinforcement and protection of earth sites.