卫辉共城遗址土性能及稳定性研究

Study on soil properties and stability of Gongcheng Site in Weihui city

遗址土保护和修复是不可移动文物研究的难点和重点。以共城遗址为研究对象,对其破坏的现状进行调研,并进行了分类总结;选取典型部位夯土,进行了基本物理指标和力学测试;利用X射线衍射仪和扫描电镜对城墙内外部的夯土进行了化学成分和微观结构分析。结果表明,外界的干湿及冻融循环造成城墙内外表面夯土性能差异较大。最后,针对共城遗址修复和使用时可能存在的工况,采用数值模拟方法,对现存的4个危险段的4个工况进行了稳定性分析。分析结果表明现有的遗址稳定性较好,但随着遗址土含水率的提高,共城遗址的稳定性降低。

The protection and restoration of site soil are the difficulties and emphases in the study of immovable cultural relics. Taking the Gongcheng Site as the research object, the current situation of its destruction was investigated and classified;The typical rammed soil was selected to carry out basic physical indexes and mechanical tests;The chemical composition and microstructure of the rammed soil inside and outside the city wall were analyzed by X-ray diffraction and scanning electron microscope. The results show that the performance of rammed soil on the inner and outer surface of the city wall is greatly different due to the external dry-wet and freeze-thaw cycles. Finally, according to the possible working conditions of Gongcheng Site during the restoration and use, numerical simulation methods were used to do the stability analysis of four existing dangerous sections under four working conditions. The analysis results show that the existing sites have good stability, but with the increase of the water content of the site soil, the stability of the Gongcheng Site decreases.