一、概述敦煌莫高窟开窟断崖属酒泉系砂砾岩,由戈壁小卵石、砂土和其它一些物质混凝而成,呈半胶结状态,成分以砂砾为主。地仗层一般有二层或三层。底层一般为麦草泥,均用窟前土拌合麦草制成,第二层用澄板土(也有用窟前土拌合较细的麻纤维做出较光滑的平 I. Overview Dunhuang Mogao Grottoes Grottoes Grottoes Grottoes by the Gobi pebbles, sand and other materials from coagulation, was semi-cemented state, mainly composed of gravel. Battle layer usually have two or three layers. The bottom is generally straw wheat straw, were used before the soil mixed with wheat straw made of the second layer with Cheng Ban soil (also useful before the soil mixed with fine linen fiber to make a more smooth