川藏铁路某特大桥成都侧岸坡工程地质特征及稳定性评价  

Slope engineering geology characteristics and stability evaluation of a grand bridge to Chengdu bank on the Sichuan-Tibet Railway

作　　者：周洪福[1,2] 冯治国 石胜伟 王保弟[5] 徐如阁 冉涛[1] ZHOU Hongfu;FENG Zhiguo;SHI Shengwei;WANG Baodi;XU Ruge;RAN tao(Chengdu Center of China Geological Survey,Chengdu,Sichuan 610081,China;College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;China Railway Major Bridge Reconnaissance&Design Institute Co.Ltd.,Wuhan,Hubei 430055,China;Institute of Exploration Technology,Chinese Academy of Geological Sciences,Chengdu,Sichuan 611734,China;China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083,China)

机构地区：[1]中国地质调查局成都地质调查中心,四川成都610081 [2]山东科技大学地球科学与工程学院,山东青岛266590 [3]中铁大桥勘测设计院集团有限公司,湖北武汉430055 [4]中国地质科学院探矿工艺研究所,四川成都611734 [5]中国自然资源航空物探遥感中心,北京100083

出　　处：《水文地质工程地质》2021年第5期112-119,共8页Hydrogeology & Engineering Geology

基　　金：中国地质调查局地质调查项目(DD20211379,DD20160272);四川省重点研发项目(2020YFS0296);第二次青藏高原综合科学考察研究资助(Grant No.2019QZKK0904)。

摘　　要：拟建的川藏铁路某特大桥是一座重要的控制性桥梁,其桥址区的地质安全风险评价具有重要的工程意义。该特大桥成都侧岸坡三面临空,海拔高差大,岩性复杂多变,岩体结构和完整性差,风化卸荷强烈,浅表部危岩体发育,调查表明成都岸八曲侧斜坡曾发生较大规模顺层岩质崩滑。采用遥感解译、剖面测量及稳定性计算等技术方法,调查成都侧岸坡地形地貌、地层岩性、结构面发育及变形破坏等特征,分析评价特大桥成都岸八曲侧顺层岩质斜坡稳定性。结果表明:天然和暴雨工况下,斜坡稳定系数大于1.1;强震(PGA>0.3 g)工况下,斜坡稳定系数小于1.0,可能出现局部或整体失稳破坏。建议在清除斜坡表部危岩体的基础上,进一步深入研究八曲侧顺层岩质斜坡未来可能出现的变形破坏范围和程度,提出针对性工程防治措施建议。The planned grand bridge is an important control bridge along the Sichuan-Tibet Railway.A large-scale bedding rock collapse occurred on the slope of the Baqu river side of Chengdu bank,with the protruding ridge,high elevation difference,complex and changeable lithology,poor rock mass structure and integrity,highly weathering and unloading and potential unstable rock mass on the surface of the slope.This paper investigates the topography and geomorphology,stratum lithology,discontinuities development and the characteristics of deformation and failure of the bank slope to Chengdu by remote sensing interpretation,profile measurement and stability calculation.The stability of bedding rock slope of the Baqu river side of Chengdu bank under natural and rainstorm conditions are analyzed and evaluated.The results show that the safety factor of slope stability is greater than 1.1;under the strong earthquake(PGA>0.3 g)conditions,the safety factor of slope stability is less than 1.0,and local or overall instability may occur.Based on removing the dangerous rock mass on the surface of the slope,it is suggested that the possible failure range and degree of the bedding rock slope on the Baqu river side should be further studied and the engineering prevention measures should be put forward.

关 键 词：工程地质 川藏铁路 特大桥 变形破坏 边坡稳定性 

分 类 号：P642.2[天文地球—工程地质学]