| There are massive earthen ruins in northwest China arid areas, which are precious mankind's cultural heritage, and its valuable historical value, artistic value and scientific value is rare all over the world. Temperature difference effect is one of main factors for earthen ruins in the area to suffer from much destruction. However, as a new type of inorganic reinforced material, Potassium Silicate (hereinafter as PS) can greatly improve the mechanical strength and the ability of anti-wind erosion of earthen ruins soil after being reinforced, which will slowdown the physical weathering caused by temperature difference effectively. At present, however, the research on reinforcement mechanism of PS materials was primarily concentrated on the mechanical properties and microstructure for the pre-and-post reinforced soil, and there was little research and analysis of influence for PS reinforced material on the heat-conduction of soil, in addition, the research on the evaluation method for the soil consolation effect was not also in-depth. For that reason, it is particularly important to intensively study the temperature field properties of PS reinforced soil using infrared imaging technology.The paper is based on The Conservation Project of Jiaohe Ruins in Turpan, Xinjiang, the changes in temperature field of reinforced soil are systematically studied from the following three aspects:the determination test of the thermal conductivity, the laboratory model test detecting the reinforcement effect of PS through infrared imaging technique and soil temperature field simulation. The main content and the research results are as follows:(1) A test device for determining the thermal conductivity of ruins soil is developed. Then, kinds of soil specimens are made from soil collected from site of Jiaohe Ruins, and then, in order to study the effect PS has on the heat transfer process of the soil, the determination test of the thermal conductivity is carried out. Test results show that the thermal conductivity of PS reinforced soil was reduced, furthermore, the larger the concentration of PS, the smaller the thermal conductivity of soil. Because the soil thermal conductivity has a close relationship with its heat conduction, so it is feasible to optimize PS material (adjusting parameters such as concentration, modulus and so on) according to the thermal conductivity of the reinforced soil, of which the purpose is to make PS have the best reinforcement effect on soil.(2) Adopting the disturbed soil collected from site of Jiaohe Ruins to make soil models, whose dimensionsφare:20cm×30cm×2.5cm. And halves of them are reinforced by 10% PS, and the others are untreated. And to keep the PS reinforced soil models standing for 30d under the condition of room temperature until being naturally air-dried. And then, a laboratory model test detecting the reinforcement effect of PS through infrared imaging is conducted. It shows that when external temperature changed, the PS reinforced soil responds slower to the temperature change compared with that of the untreated soil, for which the main reason is due to PS reduced the reinforced soil's thermal conductivity, the heat transfer process of the soil is hindered.(3) In the above laboratory model test, there is difference in the infrared thermal images for the PS reinforced soil and the PS untreated soil, which provided a possible method to carry out the non-destructive inspection of the reinforcement effect for earthen ruins soil.(4) Field test that micro-penetrometer detects the PS reinforcement effect shows that, the reason for the difference in the heat conduction performance of the reinforced soil and the untreated soil is that PS reinforcement decreases the thermal conductivity and enhances the mechanical strength of earthen ruins soil. What's more, the paper adopts the numerical analysis software of ANSYS to simulate the soil temperature field, and both simulation results and actual situation results are well coherent. |
PDF Full Text Request