川藏高速公路雅(安)康(定)段玄武岩边坡工程地质分析与防治  

Engineering Geological Analysis and Prevention of Basalt Slope in Sichuan Tibet Expressway

作　　者：成永刚 赵晓彦[2] CHENG Yonggang;ZHAO Xiaoyan(Sichuan Highway Engineering Consult Supervision Company,Chengdu,Sichuan 610041,China;Department of Geological Engineering,Southwest Jiao Tong University,Chengdu,Sichuan 610031,China)

机构地区：[1]四川公路工程咨询监理公司,四川成都610041 [2]西南交通大学地质工程系,四川成都610031

出　　处：《水利与建筑工程学报》2020年第5期165-169,共5页Journal of Water Resources and Architectural Engineering

摘　　要：川藏高速公路四川省境内工程地质条件极其复杂,分布广泛的岩浆岩建造地质体在边坡开挖的过程中常发生工程变更。由于在玄武岩、花岗岩等地质体的工程地质分析上存在较大分歧,造成边坡的潜在破坏模式、工程处治方案多存在较大的争论。基于此,以雅康高速公路ZK49+090—ZK49+260段玄武岩边坡工程治理为例,对其中的几个关键工程地质问题进行了系统分析后认为玄武岩边坡处治应依据坡体断层的性质和位置,加强工程扰动区断层的工程约束或加大人工边坡与断层之间的距离,坡体主控潜在滑面应依据流面与浅表生结构面的结合程度、延伸长度与开挖临空面的地质配套合理确定,坡体中的卸荷结构面应依据古剥蚀面和侧向临空面的位置和延续性等分析其对边坡的影响程度,地表的堆积层的稳定性应在依据物质成分、密实程度和土岩界面形态等基础上,合理设置工程措施予以防护。The engineering geological conditions of Sichuan Tibet Expressway in Sichuan Province are extremely complex,and engineering designs often have to be changed in the process of slope excavation because of the widely distributed magmatic rock formation geological bodies.Due to the differences in the engineering geological analysis of basalt,granite and other geological bodies,the potential failure mode and engineering treatment scheme of slope are more controversial.Based on this,this paper takes the basalt slope engineering treatment of Yakang Expressway ZK49+090—ZK49+260 section as an example,several key engineering geological problems were systematically analyzed.It concluded that the treatment of basalt slope should be based on the nature and location of slope fault,strengthen the engineering constraint of fault layer in engineering disturbance area or increase the distance between artificial slope and fault according to the combination degree of flow surface and shallow surface structural surface,the extension length and geological matching of excavation free surface are reasonably determined.The unloading structural plane in slope body should be analyzed according to the position and continuity of ancient denudation surface and lateral free surface,and the stability of surface accumulation layer should be reasonable based on material composition,compactness and soil rock interface morphology in the process of setting up engineering measures to protect.

关 键 词：川藏高速公路 玄武岩边坡 工程地质 分析与防治 

分 类 号：P642[天文地球—工程地质学]