Study On The Consolidation Material For The Ancient City Of Jinyang

The earthen monument is a special cultural relic with earth as the main building material.The earth monument and other forms of cultural relics have the same important historical,artistic,and scientific values.There are many earthen sites with different periods and roles in China.As a result of the nature of the earth and the site environment,most of these sites are developed various kinds of diseases and different degrees of damage.Those factors have a negative impact on the long-term preservation of the earthen monument.Therefore,research on the reinforcement and protection of earthen monument is extremely important.The main research object of this article is the ancient city ruins of Jinyang,Shanxi Province,which is an existing large-scale city site that has great research value.The ruins have lots of developmental diseases,including collapse,cracks,and biological diseases etc.These diseases cause serious damage to the ruins and greatly affect the preservation of the ancient city.Therefore,it is urgent to take measures to reinforce and protect the Jinyang ancient city site.Research on the applicability of reinforcement materials has always been a hotspot in the field of cultural relic protection and reinforcement.The reinforcement materials are mainly classified as organic reinforcement materials,inorganic reinforcement materials,and organic-inorganic reinforcement materials.In this study,inorganic and organic hybrid materials were selected as the reinforcement materials.In combination with the basic requirements and principles of soil-site reinforcement protection,polyurethane acrylate(PUA)and lime were selected.In this study,the mixture ratio of the reinforcement materials was determined through indoor tests such as compressive strength tests,shear tests,consolidation tests,water resistance tests,and spray tests.Thermal conductivity and shrinkage characteristics of the samples before and after reinforcement were also investigated.At the same time,the reinforcement mechanism was analyzed from the microscopic level.The main results of this study are shown as follows:(1)It is concluded that the addition of polyurethane acrylate(PUA)can effectively enhance the physical and mechanical properties of the site soil through laboratory tests.Combining all the test results,the soil and lime(10:0.7)+3% polyurethane acrylate(PUA)is the best ratio;(2)The thermal conductivity of the soil sample reinforced by polyurethane acrylate(PUA)is larger than that of the original soil,and the addition of lime causes the thermal conductivity of the soil sample to be lower than that of the original soil.The thermal conductivity of the original soil sample and the site soil reinforced with different addition all increased linearly with increasing of water content and dry density.(3)The original soil has a very large volume shrinkage after being reinforced with polyurethane acrylate(PUA),while the addition of lime effectively weakens such a large shrinkage caused by polyurethane acrylate(PUA).The SEM microscopic scanning results can be concluded that polyurethane urethane(PUA)and lime can enhance the bond between the soil particles,forming a more solid skeleton between the soil particles.Hence,it could achieve the purpose of reinforcement and protection.