滇西北地区冰碛层分布特征及工程效应  

Distribution Characteristics and Engineering Effects of the Moraine Layer

作　　者：柴春阳[1] 邓宏科[1] 余行健 胡婷[2] CHAI Chunyang;DENG Hongke;YU Xingjian;HU Ting(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Sichuan Vocational School of Communication,Chengdu 611130,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]四川交通运输职业学校,成都611130

出　　处：《路基工程》2024年第1期21-25,共5页Subgrade Engineering

摘　　要：依托铁路、公路工程建设,在野外勘察、室内和现场原位试验基础上,重点研究滇西北地区冰碛层的分布特征、岩土类型、物质组成及颗粒成分、胶结程度和物理力学性质,对冰碛层的地基强度和边坡稳定性进行综合评价。冰碛层根据分布特征分为洼地型、阶地型、谷肩型;根据物质组成等可分为角砾岩和碎石类混合土,承载力和地基稳定性均较好;角砾岩单轴抗压强度较高;碎石类混合土抗剪强度较高,但水稳定性和地基均匀性较差。冰碛层边坡局部自稳性较好,但底部和层间可能存在软弱夹层。Relying on the construction of railway and highway engineering,on the basis of field investigation,indoor and in-situ tests,the distribution characteristics,geotechnical types,material composition,particle composition,degree of cementation and physico-mechanical properties of the moraine layer in the Northwest Yunnan region are mainly studied,and the foundation strength and slope stability of moraine layer are comprehensively evaluated.According to the distribution characteristics of the moraines,the moraines layer can be divided into depression type,terrace type and valley shoulder type.According to material composition,they can be divided into breccia and gravel mixed soil,and they are with good bearing capacity and foundation stability.The uniaxial compressive strength of breccia is higher.The shear strength of crushed stone mixed soil is higher,but the water stability and foundation uniformity are poor.The slope of moraine layer has good local self-stability,but there may be weak interlayers at the bottom and between layers.

关 键 词：滇西北地区 冰川作用 冰碛层 分布特征 工程效应 岩土类型 

分 类 号：P642.3[天文地球—工程地质学]