陕西安塞—靖边高速公路段工程地质条件

Engineering geological condition in Ansai-Jingbian expressway, Shaanxi Province

经过野外勘查,结合遥感图像解译,进一步查明了安塞—靖边高速公路段地质构造概况、工程地质、水文条件和地质灾害的类型与分布。结果表明:路段内崩塌及危岩体主要分布于延河上游及其支流康河、桥川河的凹岸;滑坡灾害主要发育在黄土层分布区及部分基岩段;路段中、南部的黄土多具湿陷性;现代流动沙丘及沙漠化灾害主要见于靖边县一带,及其以北毛乌素沙漠地段。在此基础上,将设计路线带划分为3个工程地质区,即风积沙漠滩地、风积黄土梁峁及河谷阶地、涧地工程地质区,为合理选线提供了科学依据。

Detailed geological investigation and interpretation of remotesensing images of AnsaiJingbian expressway have provided us with further understanding of its general geological, engineering geologic and hydrogeologic situations, types and developing rules of geologic disasters.Collapse mainly happened on concave banks of upstream of Yanhe ,Kanghe and Luhe;landslip mainly develops in loess areas and basement rock areas;central part and southern part mainly have settlement by loess soaking; morden active sand dune and desertifications spread in Jingbian and northern part of Maowusu desert. On the basis of these information,this area may be devided into three engineering geologic subareas:aeolian accumulation desert engineering geologic section,aeolian accumulation loess engineering geologic section and river terrace engineering geologic section,and provide scientific evidences for rational choice.