关键词: 岩堆, 路基, 沉降, 处治, 离心模型

Abstract: The cliff debris subgrade is a special type of subgrade in mountainous highway construction. Based on the cliff debris subgrade conditions of Shui-ma Highway （from Shuifu to Maliu Bay） in Yunna Province, the rule and the influence factors of sedimentation change of rock subgrade settlement which is of different ratio of soil and rock, of different density, and of different thickness are studied by centrifuge model test. According to the centrifuge model test results, three methods of reducing cliff debris subgrade sedimentation are proposed, including replacing soft cliff debris with block stone, rein-forcement soil and stability soil respectively; and their effects on reducing the sedimentation are tested by centrifuge model test. The centrifuge model test results of three processing methods show that the stability soil replacement and block stone replacement have better effects in reducing the sedimentation of cliff debris subgrade and can be used in reducing the sedimentation of cliff debris subgrade under different condition.

Key words: cliff debris , subgrade , sedimentation , treatment , centrifuge model test ;