成都盆地西缘第四纪砾石层成因及其工程特性研究

成都盆地西南缘大面积分布第四纪沉积物，整体上岩性主要为一套黄灰色、灰黄色砂砾层、粘土层。根据多条铁路的野外考察和部分试验结果，对砾石层进行成因及风化特征研究，并对其工程地质性质作出初步评价。根据历史成因分为四个主要类型:大邑砾石层（Q1）、名邛砾石层（Q21）、丹思砾石层（Q22）、雅安砾石层（Q31）。区内砾石层普遍存在风化作用，它对工程性质的影响较为明显。

Study on Genesis and Engineering Characteristics of Quarternary Gravel Bed at the Western Edge of Chengdu Basin

lithological Depending weathering evaluated. Gravel Bed gravel beds Quarternary sediments are distributed in a large area at the southwest edge of Chengdu Basin. The character as a whole is a set of yellow-grey, or sallow sandy gravel bed and clay bed primarily. on the results of field investigation and part of tests about many railways, the genesis and characteristics of the gravel bed are studied, and the properties of the engineering geology are According to the genesis, it is divided into four categories ： Dayi Gravel Bed （ Q1 ）, Mingqi （Q2^1）, Dansi Gravel Bed （Q2^2）, and Ya＇an Gravel Bed （Q3^1）. There are weathering in in the area generally affecting the engineering properties obviously. ong the