嘉峪关地区第四系上更新统胶结层成因分析  

Causes analysis of Quaternary Pleistocene Series cemented layer in Jiayuguan area

作　　者：郑衡 ZHENG Heng(Gansu Provincial Transportation Planning Survey and Design Institute Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]甘肃省交通规划勘察设计院股份有限公司,甘肃兰州730000

出　　处：《青海大学学报》2023年第6期88-94,共7页Journal of Qinghai University

基　　金：甘肃省交通运输厅项目(甘交建设函[2020]920号)。

摘　　要：为了查明嘉峪关地区第四系上更新统胶结层的成因和工程特性,在S06酒(酒泉)嘉(嘉峪关)绕城高速公路工程K28+960~K50+000段,通过野外地质调查、工程地质钻探、钻孔取样、室内试验等,对该地区第四系上更新统胶结层的分类、分布特征、成因环境、工程地质等进行了总结分析,结果表明:工程区近地表为硫酸盐胶结,下部根据胶结物的不同分为黏土胶结层、砂土胶结层、圆砾胶结层,其成因主要为胶结矿物的淋滤、聚集、凝结、结晶及胶结,胶结层具有岩石或半成岩性质,以及较高的抗压强度、较强的抗崩解、抗软化及抗风化等工程性质。胶结层的分布及埋藏特征较复杂,与周围土层性质有显著差异,岩土施工工程分级为Ⅳ~Ⅴ,研究结果可为类似工程勘察设计提供参考。In order to find out the causes and engineering characteristics of the Quaternary Pleisto-cene cemented layer in Jiayuguan area,the field geological survey,engineering geological drilling,drilling sampling and laboratory tests are carried out in the section K28+960~K50+000 of the S06 Jiuquan Jiayuguan Ring Expressway project.The classification,distribution characteristics,genetic environment and engineering geology of Quaternary Pleistocene cemented layer in the area are sum-marized and analyzed.The results show that the near surface of the engineering area is sulfate cemen-tation,while the lower part is divided into clay cementation,sand cementation and round gravel soil cementation layer according to the dfferent cementation materials.The main causes are the leaching,aggregation,condensation,crystallization and cementation of cementing minerals.The cemented layer has the performance of rock or hypabyssal rock,showing high compressive strength,strong resistance to disintegration,softening and weathering and other engineering properties.The distribution and burial characteristics of the cemented layer are complicated,which is different from the surrounding soil layer.The grade of geotechnical construction engineering is Ⅳ~Ⅴ.The research can provide reference for similar engineering survey and design.

关 键 词：嘉峪关地区 第四系上更新统 胶结层 成因分析 

分 类 号：P642.113[天文地球—工程地质学]