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Li Y.,Heritage University | Xie H.,Nanjing Southeast University | Ogura D.,Kyoto University | Hu S.,Nanjing Southeast University | Guo Q.,Conservation Institute of Dunhuang Academy
Journal of Asian Architecture and Building Engineering | Year: 2016

It is a challenge for the conservation of soil ruin sites that molds grow on the surface of damp soil ruins in soil ruin exhibition halls in high-humidity regions. The ventilation and lighting modes of soil ruin exhibition halls directly affect mold reproduction, but studies on the quantitative relationship between environmental factors and mold propagation on surfaces in damp soil ruins are insufficient. The Wenzhou Qiaolou soil ruin was selected as an example in this study, and rammed earth from this ruin was used as the experiment sample. For the ventilation and lighting modes as experimental variables, four ventilation and lighting environmental conditions were simulated for 56 days in a laboratory to compare differences in mold growth on samples of damp rammed earth surfaces. In this study, the difference of mold growth in different ventilation and lighting conditions were discussed, and some suggestions for the environmental management of soil ruin exhibition halls in high-humidity regions were given. © 2016, Architectural Institute of Japan. All rights reserved.


Li G.S.,CAS Institute of Remote Sensing | Li G.S.,Chinese Academy of Sciences | Li G.S.,University of Chinese Academy of Sciences | Qu J.J.,Chinese Academy of Sciences | And 3 more authors.
Ecological Engineering | Year: 2013

Protecting the Mogao Grottoes in fragile ecology sites has significant values in sand control by using desert shrub belts. The monthly height changes of aeolian sand deposits by using erosion pins indicates that Hedysarum scoparium and Tamarix ramosissima Ledeb. are best arranged in two adjacent parallel configurations perpendicular to the main wind path, and T. ramosissima Ledeb., H. scoparium, and Caragana korshinskii Kom. exhibit sand prevention effects during April, June, and May and November, respectively, and H. scoparium is the most suitable desert shrub atop the Mogao Grottoes. The yearly change of accumulated sand suggests that shrub belts have better sand prevention effects. However, sand accumulated by shrub belts could become another sand source that can damage the grottoes. © 2013.


Li G.S.,Chinese Academy of Sciences | Li G.S.,CAS Institute of Remote Sensing | Li G.S.,University of Chinese Academy of Sciences | Qu J.J.,Chinese Academy of Sciences | And 4 more authors.
Terrestrial, Atmospheric and Oceanic Sciences | Year: 2013

To study the micro-meteorological effects of different underlying surfaces of structures to protect the Mogao Grottoes, we analyzed basic meteorological measurements collected at weather stations located in front of the grottoes, on top of the grottoes and in the artificial Gobi. The results show that the shelterbelts in front of the grottoes have a heat-retaining effect. The profile of average daily solar radiation in front of the grottoes forms a sharp peak and the profile in the Gobi forms a parabola, but these patterns vary in different seasons. The artificial Gobi was more susceptible to extremes in temperature and had a faster response and wider response range to ground temperature. The average monthly air temperature, average monthly relative humidity, and the average wind speed in the artificial Gobi tend to first decrease and then increase with measurement height. Copyright © 2005 TAO All right reserved.


Ouyang X.,Shanghai JiaoTong University | Zhang D.,Shanghai Normal University | Wang X.,Conservation Institute of Dunhuang Academy | Guo Q.,Conservation Institute of Dunhuang Academy
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2016

In order to explore the evaluating method of infrared imaging detection technique(differences in thermal conductivity) for potassium silicate(PS) reinforced earthen ruins soil, adopting the disturbed soil collected from Jiaohe ruins to make soil models, which are reinforced by different concentration of PS, the mechanical strength and thermal conductivity of soil models were determined. It is shown that mechanical strength increase and thermal conductivity reduce for PS reinforced soil. Under the condition of the same dosage of PS, the larger the concentration of PS is, the higher the mechanical strength of soil is, but the smaller the thermal conductivity of soil is. Through analyzing the experiment data regression, thermal conductivity and strength has a good linear negative relationship. Finally, explore the alterative mechanism of thermal conductivity of soil in the effect of PS, describe the relationship between thermal conductivity and strength in the from microstructure of soil. The relationship above shows that thermal conductivity can be used to evaluate the reinforcing effects of earthen sites, which provides a possible method to carry out the non-destructive inspection of the effect for PS reinforced earthen ruins soil. © 2016, Science Press. All right reserved.


Wang T.-R.,Shanghai JiaoTong University | Zhang D.-X.,Shanghai JiaoTong University | Wang X.-D.,Conservation Institute of Dunhuang Academy | Guo Q.-L.,Conservation Institute of Dunhuang Academy
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

As a new type of newly arisen nondestructive testing technology, the conduction of infrared imaging technique is based on changes of the objects' temperature field, which is widely used in the detection of objects' structure state, properties, internal defects, etc. at present. In order to explore nondestructive testing method for potassium silicate(PS) reinforced earthen ruins soil, adopting the disturbed soil collected from site of Jiaohe Ruins to make soil models, halves of which are reinforced by 10% PS; and the others are untreated. And to keep the PS reinforced soil models standing for 30 d 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 is shown that the PS hinders the heat transfer process of soil; besides, there is difference in the infrared thermal images for the PS reinforced soil and the PS untreated soil, which provides a possible method to carry out the non-destructive inspection of the reinforcement effect for earthen ruins soil. Finally, field test that micro-penetrometer detected the PS reinforcement effect and the determination test of the thermal conductivity are conducted; and the test results show 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.

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