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| 藏东昌都觉学红层滑坡的地质成因分析 |
| 李洪梁,陈龙,杨栋,张佳佳,田尤,蔡佳君,王灵,李宝幸 |
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| (中国地质科学院探矿工艺研究所, 四川 成都 611734;中国地质调查局地质灾害防治技术中心, 四川 成都 611734;西南石油大学土木工程与测绘学院, 四川 成都 610500;中国地质科学院探矿工艺研究所, 四川 成都 611734;中国地质调查局地质灾害防治技术中心, 四川 成都 611734;中国地质大学(北京)地球科学与资源学院, 北京 100083) |
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| 摘要: |
| 觉学红层滑坡发育于向斜北东翼形成的反向坡，是近年来依托川藏交通廊道沿线灾害地质调查在新厘定的“藏东昌都红层区”发现的典型红层滑坡。为厘定其成因，以基础地质为切入点，进行了详实的地质调查与分析。结果表明，滑坡区地层岩性主要为中侏罗统东大桥组(J2d)紫红色、灰色薄层泥岩、粉砂质泥岩夹中-厚层砂岩。地层内发育与区域构造活动配套的轴面劈理(S1)、“X”型共轭剪节理(S2、S3)和层间剪切劈理(S4)。文章从沉积环境控制地层岩性及物理力学性质、区域构造演化制约斜坡结构与岩体结构面组合特征和地下水及重力作用加剧斜坡失稳等角度，提出觉学红层滑坡形成于内外地质营力耦合的失稳机理，对区域红层滑坡防治和川藏交通建设具有一定参考价值。 |
| 关键词: 红层滑坡 反向坡 地质成因 结构面 构造演化 川藏交通廊道 |
| DOI：10.19826/j.cnki.1009-3850.2022.02002 |
| 附件 |
| 投稿时间：2021-08-18修订日期：2021-11-13 |
| 基金项目:中国地质调查局项目(DD20221741，DD20190644，DD20190505)，第二次青藏高原综合科学考察研究(2019QZKK0902)，国家自然科学基金青年项目(41807300)，西藏自治区自然资源厅项目(藏财采【2020】0890-1)和中国地质科学院探矿工艺研究所科研结余资金项目(2022004)联合资助 |
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| Geological genesis of the Juexue red strata landslide in Qamdo, eastern Tibet |
| LI Hongliang,CHEN Long,YANG Dong,ZHANG Jiajia,TIAN You,CAI Jiajun,WANG Ling,LI Baoxing |
| (Institute of Exploration Technology, Chinese Academy of Geological Sciences, Chengdu 611734, China;Geohazard Prevention Technology Center, China Geological Survey, Chengdu 611734, China;College of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610050, China;Institute of Exploration Technology, Chinese Academy of Geological Sciences, Chengdu 611734, China;Geohazard Prevention Technology Center, China Geological Survey, Chengdu 611734, China;School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China) |
| Abstract: |
| The Juxue red strata landslide developed on the reverse slope formed in the northeast wing of the syncline, and it is a typical red strata landslide found in the newly defined "Qamdo red strata area" based on the geohazards survey along the Sichuan-Tibet traffic corridor in recent years. To determine its genesis, based on basic geology, detailed geological investigation and analysis are carried out. The results show that the stratigraphic lithology of the landslide area is mainly purplish red and gray thin mudstone and silty mudstone interbedded with middle-thick sandstone of middle Jurassic Dongdaqiao Formation (J2d). The axial plane cleavage (S1), X-type conjugate shear joints (S2, S3) and interlayer shear cleavage (S4) are developed in the strata, which are compatible with regional tectonic activity. From the point of view that sedimentary environment controlling stratum lithology and physical and mechanical properties, regional tectonic evolution restricting slope structure and rock mass structural plane combination characteristics, and groundwater and gravity aggravating slope instability, it is suggested that Juexue red strata landslide is formed by the coupling mechanism of internal and external geological forces, which has certain reference value for regional red strata landslide prevention and control and Sichuan-Tibet transportation construction. |
| Key words: red strata landslide reverse slope geological genesis structural plane tectonic evolution Sichuan-Tibet traffic corridor |