工程地质学报2018，Vol.26Issue(6)：1499-1507,9.DOI:10.13544/j.cnki.jeg.2017-538
敦煌莫高窟北区崖体沿纵深方向风化特征研究
STUDY ON WEATHERING CHARACTERISTICS OF ROCK MASS ALONG DEPTH DIRECTION OF CLIFF LOCATED AT NORTH OF DUNHUANG MOGAO GROTTOES
摘要
Abstract
The increasingly severe weathering erosion affects the stability of surrounding rocks and the preserving environment of wall paintings, which has become a great threat to the security of the grotto relics. A cliff located at the north of the Mogao grottoes is selected as the research site. The method of gradual dissection is adopted, and samples are numbered in sequence along the horizontal direction from the surface. A series of experiments are conducted and include size distribution test, field acoustic wave test, soluble salt test and X-Ray diffraction test.The results illustrate that the grain composition of the cliff have an effect on weather resistance. The curve of wave velocity fluctuates along the excavation depth. The content of sodium feldspar decreases within depth of 0.7 m as Quartz increases. As one of the main contribution to weathering of rock mass, soluble salts accumulate within the depth ranging from 0.4 m to 1.0 m. By comprehensive analysis on experimental results, depths in 1.0 m, 0.6 m and 0.4 m are respectively regarded as the weathering depths of No.1, No.2 and No.3 horizontal testing caves. As for the variation among cliff space, the heaviest weathering happening at upper part and weakest weathering lies at lower part.关键词
莫高窟崖体/地层/砂砾岩/风化特征Key words
Cliff of Mogao/Grottoes stratum/Sandy conglomerate/Weathering characteristics分类
天文与地球科学引用本文复制引用
张景科,梁行洲,叶飞,郭志谦,谌文武,郭青林,于宗仁..敦煌莫高窟北区崖体沿纵深方向风化特征研究[J].工程地质学报,2018,26(6):1499-1507,9.基金项目
甘肃省基础研究创新群体(145RJIF336)资助. （145RJIF336）
