定远营遗址稳定性和微观劣化的研究

在自然环境的反复作用下,土遗址表层持续劣化并产生宏观病害,致使土遗址本体的稳定性存在隐患,合理评价土遗址的安全性为文物界所关注.以西北地区阿拉善盟定远营城墙为研究对象,定性分析城墙各段病害,测定城墙土样的基本物理指标和力学性能,运用ABAQUS软件进行数值模拟,对比分析自然状态和降雨条件下的城墙稳定性,发现随含水率提高城墙存在失稳的危险.在宏观劣化现象分析基础上,运用X射线衍射仪和扫描电镜技术对城墙内外部夯土的成分和微观结构进行研究,探讨城墙劣化的机理.对土遗址稳定性和微观劣化的分析方法揭示了残存土遗址的真实状态,有助于土遗址的保护和修复,避免土遗址修复方案的盲目性.

Study on stability and micro deterioration of site soil in Dingyuanying

Earthen sites are exposed to natural environment for a long time, and the wall diseases induced by external forces pose a threat to their preservation. Based on the study of the wall of Dingyuanying in Alashan, Northwest China, the disease of each section is described, the basic physical indexes and mechanical properties of the collected soil samples are measured, the ABAQUS software is used to simulate the stability of the wall under the condition of natural state and rainfall is compared and analyzed. Based on the macroscopic deterioration, the composition and microstructure of rammed earth inside and outside the wall were studied by using X ray diffractometer and scanning electron microscope. the mechanism of soil deterioration. Based on the macro-mechanical test, the stability of the typical Dingyuanying city wall is analyzed, and the soil structure of the meso-scale site is combined to provide ideas for the restoration and maintenance of the soil site.