关键词: 高位滑坡； 相似材料； 小相似比； 正交试验； 极差分析； 回归分析； 松坪沟

Abstract: The selection and preparation of similar materials is a key to successfully simulate prototype slopes.For high-elevation landslides with a slope height of several hundred meters or even thousands of meters，due to the limitation of test conditions，it is necessary to adopt a small similarity ratio （1∶100~1∶1000） and prepare similar materials with lower strength in physical simulation tests.However，the strength of existing similar materials is often too large to meet the test requirements.A vibration platform model test with a geometric similarity ratio of 1∶200 was designed based on the 500 m high bedding rock slope at the Songpinggou gully in Maoxian County，Sichuan Province，and 16 groups of ratio samples were designed by orthogonal test method.In the orthogonal test，iron powder/aggregate，iron powder/（iron powder+barite powder），gypsum/mixture，water/mixture，glycerol/mixture were selected as five factors，each factor set four levels，and the physical and mechanical parameters of each group of samples were tested through laboratory tests.The results showed that the mechanical parameters of the prepared materials changed in a large range，which could meet the model test needs of small similarity ratio，high density，high internal friction angle and low strength similarity.The cohesion of similar materials decreased first and then increased with the increase of barite powder and iron powder content，the internal friction angle increased first and then decreased with the increase of quartz content，while the elastic modulus increased first and then decreased with the increase of barite powder and iron powder content.The test results have reference significance for the materials preparation of similar small similarity ratio model test.

Key words: similar material； small similarity ratio； orthogonal test； range analysis； regression analysis； high landslide